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This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.
In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
For more information, please refer to <http://unlicense.org/>

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# Color-space [![Build Status](https://travis-ci.org/colorjs/color-space.svg?branch=master)](https://travis-ci.org/colorjs/color-space) [![stable](https://img.shields.io/badge/stability-stable-brightgreen.svg)](http://github.com/badges/stability-badges) [![OpenCollective](https://opencollective.com/color-space/backers/badge.svg)](#backers) [![OpenCollective](https://opencollective.com/color-space/sponsors/badge.svg)](#sponsors)
<img src="https://raw.githubusercontent.com/colorjs/color-space/gh-pages/logo.png" width="100%" height="150"/>
Conversions and data for color spaces. [Demo](http://colorjs.github.io/color-space).
## Usage
[![npm install color-space](https://nodei.co/npm/color-space.png?mini=true)](https://npmjs.org/package/color-space/)
```js
var space = require('color-space');
//convert lab to lch
var result = space.lab.lch([80,50,60]);
```
You can require a separate space to reduce size significantly:
```js
var rgb = require('color-space/rgb');
var hsl = require('color-space/hsl');
//convert rgb to hsl
rgb.hsl([200,230,100]);
```
## API
```js
<fromSpace>.<toSpace>(array);
<space>.name //space name
<space>.min //channel minimums
<space>.max //channel maximums
<space>.channel //channel names
<space>.alias //alias space names
```
## Spaces
* [x] [RGB](https://en.wikipedia.org/wiki/CIE_1931_color_space#CIE_RGB_colour_space) — additive color model based on red, green and blue primary colors.
* [x] [HSL](https://en.wikipedia.org/wiki/HSL_and_HSV) — cylindrical-coordinates representation of RGB.
* [x] [HSV, HSB](https://en.wikipedia.org/wiki/HSL_and_HSV)
* [x] [HWB](http://dev.w3.org/csswg/css-color/#the-hwb-notation)
* [x] [HSI](https://en.wikipedia.org/wiki/HSL_and_HSV) — used for computer vision due to better separation of shapes in an image, comparing to HSL/HSB.
* [x] [CMYK](https://en.wikipedia.org/wiki/CMYK_color_model)
* [x] [CMY](https://en.wikipedia.org/wiki/CMYK_color_model)
* [x] [XYZ](http://en.wikipedia.org/wiki/CIE_1931_color_space)
* [x] [XYY (YXY)](https://en.wikipedia.org/wiki/CIE_1931_color_space#CIE_xy_chromaticity_diagram_and_the_CIE_xyY_color_space)
* [x] [LAB](http://en.wikipedia.org/wiki/Lab_color_space)
* [x] [LCH<sub>ab</sub>](https://en.wikipedia.org/wiki/Lab_color_space#Cylindrical_representation:_CIELCh_or_CIEHLC)
* [x] [LUV](http://en.wikipedia.org/wiki/CIELUV)
* [x] [LCH<sub>uv</sub>](http://en.wikipedia.org/wiki/CIELUV#Cylindrical_representation)
* [x] [HSL<sub>uv</sub>](http://www.hsluv.org/)
* [x] [HPL<sub>uv</sub>](http://www.hsluv.org/)
* [x] [LAB<sub>Hunter</sub>](http://en.wikipedia.org/wiki/Lab_color_space#Hunter_Lab)
* [x] [YUV](https://en.wikipedia.org/?title=YUV)
* [x] [YIQ](https://en.wikipedia.org/?title=YIQ)
* [x] [YC<sub>g</sub>C<sub>o</sub>](https://en.wikipedia.org/wiki/YCgCo)
* [x] [YD<sub>b</sub>D<sub>r</sub>](https://en.wikipedia.org/wiki/YDbDr)
* [x] [YP<sub>b</sub>P<sub>r</sub>](https://en.wikipedia.org/wiki/YPbPr)
* [x] [YC<sub>b</sub>C<sub>r</sub>](https://en.wikipedia.org/wiki/YCbCr)
* [x] [Y<sub>c</sub>C<sub>bc</sub>C<sub>rc</sub>](https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.2020_conversion)
* [x] [JPEG](https://en.wikipedia.org/wiki/YCbCr#JPEG_conversion)
* [x] [XvYCC](https://en.wikipedia.org/wiki/XvYCC)
* [x] [UCS](https://en.wikipedia.org/wiki/CIE_1960_color_space)
* [x] [UVW](https://en.wikipedia.org/wiki/CIE_1964_color_space)
* [ ] [Munsell](https://en.wikipedia.org/wiki/Munsell_color_system)
* [ ] [NCS](https://en.wikipedia.org/wiki/Natural_Color_System)
* [ ] [PMS](https://en.wikipedia.org/wiki/Pantone)
* [ ] [RAL](https://en.wikipedia.org/wiki/RAL_colour_standard)
* [ ] [TSL](https://en.wikipedia.org/wiki/TSL_color_space)
* [ ] [RG](https://en.wikipedia.org/wiki/RG_color_space)
* [ ] [RGK](https://en.wikipedia.org/wiki/RG_color_space)
* [x] [Coloroid](https://en.wikipedia.org/wiki/Coloroid) — color space for architects and visual constructors, Hungarian Standard MSZ 7300 since 2000.
* [ ] [OSA-UCS](https://en.wikipedia.org/wiki/OSA-UCS) — accurately reprsenting uniform color differences, developed by the Optical Society of America’s Committee on Uniform Color Scales.
* [ ] [HKS](https://en.wikipedia.org/wiki/HKS_(colour_system))
* [x] [LMS](http://en.wikipedia.org/wiki/LMS_color_space) — represents sensitivity of the human eye to Long, Medium and Short wavelengths.
* [x] [Cubehelix](https://www.mrao.cam.ac.uk/~dag/CUBEHELIX/) — colormaps for data visualization.
* [ ] [Gray](http://dev.w3.org/csswg/css-color/#grays)
* [ ] [CIECAM02](https://en.wikipedia.org/wiki/CIECAM02)
* [ ] [US Federal Standard 595](https://en.wikipedia.org/wiki/Federal_Standard_595)
* [ ] [Toyo](http://mytoyocolor.com/)
* [ ] [PhotoYCC](http://www5.informatik.tu-muenchen.de/lehre/vorlesungen/graphik/info/csc/COL_34.htm)
* [x] [HCG](https://github.com/acterhd/hcg-legacy)
* [ ] [HCL](http://www.chilliant.com/rgb2hsv.html)
* [x] [HSP](http://alienryderflex.com/hsp.html)
* [ ] [HCY](http://chilliant.blogspot.ca/2012/08/rgbhcy-in-hlsl.html)
* [x] [YES](http://www.atlantis-press.com/php/download_paper.php?id=198) — computationally effective color space for face recognition.
* [ ] [British Standard Colour](http://www.britishstandardcolour.com/)
* [ ] [RG chromacity](https://en.wikipedia.org/wiki/Rg_chromaticity)
* [ ] [CIE DSH](https://en.wikipedia.org/wiki/Rg_chromaticity)
* [ ] [HSM](http://seer.ufrgs.br/rita/article/viewFile/rita_v16_n2_p141/7428)
## Contribute
Please fork, add color space with basic _conversions_ to/from XYZ or RGB and _tests_.
The goal of project is to provide the most complete set of color spaces with maximally minimal uniform API.
## Credits
Thanks to all the color scientists, who devoted their lives to color research and delivered their knowledge to us, for now we can trust them and use their formulas and their code.
### Backers
Support us with a monthly donation and help us continue our activities. [[Become a backer](https://opencollective.com/color-space#backer)]
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## Related
* [colormap](https://github.com/bpostlethwaite/colormap) — collection of colormaps to map colors of images/data. A replacement for visualising spaces like cubehelix.
* [color-spectrum](https://www.npmjs.com/package/color-spectrum) — convert spectrum to a color.
* [color-interpolate](https://www.npmjs.com/package/color-interpolate) — interpolate between color values.
* [color-tool](https://www.npmjs.com/package/color-tool) — color picker based on color-space.
## Similar projects
* [color-convert](https://github.com/harthur/color-convert)
* [chromatist](https://github.com/jrus/chromatist)
* [spectra](https://github.com/avp/spectra)
* [colorspaces.js](https://github.com/boronine/colorspaces.js)

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/**
* CIECAM02 http://en.wikipedia.org/wiki/CIECAM02
*
* @todo add transforms
*
* @module cam
*/
'use strict'
var xyz = require('./xyz');
var cam = module.exports = {
name: 'cam',
alias: ['ciecam', 'ciecam02'],
};
//extend xyz
xyz.cam = function(xyz){
var x = xyz[0], y = xyz[1], z = xyz[2];
//TODO
};
cam.xyz = function () {
}

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/**
* @module color-space/cmy
*/
'use strict'
var rgb = require('./rgb');
var cmy = module.exports = {
name: 'cmy',
min: [0,0,0],
max: [100,100,100],
channel: ['cyan', 'magenta', 'yellow'],
alias: ['CMY']
};
/**
* CMY to RGB
*
* @param {Array} cmy Channels
*
* @return {Array} RGB channels
*/
cmy.rgb = function(cmy) {
var c = cmy[0] / 100,
m = cmy[1] / 100,
y = cmy[2] / 100;
return [
(1 - c) * 255,
(1 - m) * 255,
(1 - y) * 255
];
};
/**
* RGB to CMY
*
* @param {Array} rgb channels
*
* @return {Array} CMY channels
*/
rgb.cmy = function(rgb) {
var r = rgb[0] / 255,
g = rgb[1] / 255,
b = rgb[2] / 255;
return [
(1-r) * 100 || 0,
(1-g) * 100 || 0,
(1-b) * 100 || 0
];
};

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/**
* @module color-space/cmyk
*/
'use strict'
var rgb = require('./rgb');
module.exports = {
name: 'cmyk',
min: [0,0,0,0],
max: [100,100,100,100],
channel: ['cyan', 'magenta', 'yellow', 'black'],
alias: ['CMYK'],
rgb: function(cmyk) {
var c = cmyk[0] / 100,
m = cmyk[1] / 100,
y = cmyk[2] / 100,
k = cmyk[3] / 100,
r, g, b;
r = 1 - Math.min(1, c * (1 - k) + k);
g = 1 - Math.min(1, m * (1 - k) + k);
b = 1 - Math.min(1, y * (1 - k) + k);
return [r * 255, g * 255, b * 255];
}
};
//extend rgb
rgb.cmyk = function(rgb) {
var r = rgb[0] / 255,
g = rgb[1] / 255,
b = rgb[2] / 255,
c, m, y, k;
k = Math.min(1 - r, 1 - g, 1 - b);
c = (1 - r - k) / (1 - k) || 0;
m = (1 - g - k) / (1 - k) || 0;
y = (1 - b - k) / (1 - k) || 0;
return [c * 100, m * 100, y * 100, k * 100];
};

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/**
* Architects and visual constructors hungarian color space.
*
* http://hej.sze.hu/ARC/ARC-030520-A/arc030520a.pdf
*
* @module color-space/coloroid
*/
'use strict'
var xyy = require('./xyy');
var xyz = require('./xyz');
/**
* Main color space object
*/
var coloroid = {
name: 'coloroid',
alias: ['ATV'],
//hue, saturation, luminosity
//note that hue values are ids, not the numbers - not every value is possible
//e.g. 38 will be rounded to 36
channel: ['A','T','V'],
min: [10, 0, 0],
max: [76, 100, 100]
};
/**
* Coloroid table
* Regression of values is almost impossible, as hues don’t correlate
* Even angle values are picked very inconsistently, based on aesthetical evaluation.
*
* - tgф, ctgф are removed, ф is searched instead
* - eλ = xλ + yλ + zλ
* - λ is removed as not used
*/
coloroid.table = [
//A angle eλ xλ yλ
[ 10, 59.0, 1.724349, 0.44987, 0.53641 ],
[ 11, 55.3, 1.740844, 0.46248, 0.52444 ],
[ 12, 51.7, 1.754985, 0.47451, 0.51298 ],
[ 13, 48.2, 1.767087, 0.48601, 0.50325 ],
[ 14, 44.8, 1.775953, 0.49578, 0.49052 ],
[ 15, 41.5, 1.785073, 0.50790, 0.43035 ],
[ 16, 38.2, 1.791104, 0.51874, 0.46934 ],
[ 20, 34.9, 1.794831, 0.52980, 0.45783 ],
[ 21, 31.5, 1.798664, 0.54137, 0.44559 ],
[ 22, 28.0, 1.794819, 0.55367, 0.43253 ],
[ 23, 24.4, 1.789610, 0.56680, 0.41811 ],
[ 24, 20.6, 1.809483, 0.58128, 0.40176 ],
[ 25, 16.6, 1.760983, 0.59766, 0.38300 ],
[ 26, 12.3, 1.723443, 0.61653, 0.36061 ],
[ 30, 7.7, 1.652891, 0.63896, 0.33358 ],
[ 31, 2.8, 1.502607, 0.66619, 0.29930 ],
[ 32, -2.5, 1.072500, 0.70061, 0.26753 ],
[ 33, -8.4, 1.136637, 0.63925, 0.22631 ],
[ 34, -19.8, 1.232286, 0.53962, 0.19721 ],
[ 35, -31.6, 1.310120, 0.50340, 0.17495 ],
[ 40, -43.2, 1.376610, 0.46041, 0.15603 ],
[ 41, -54.6, 1.438692, 0.42386, 0.13846 ],
[ 42, -65.8, 1.501582, 0.38991, 0.12083 ],
[ 43, -76.8, 1.570447, 0.35586, 0.10328 ],
[ 44, -86.8, 1.645583, 0.32195, 0.08496 ],
[ 45, -95.8, 1.732083, 0.28657, 0.05155 ],
[ 46, -108.4, 1.915753, 0.22202, 0.01771 ],
[ 50, -117.2, 2.146310, 0.15664, 0.05227 ],
[ 51, -124.7, 1.649939, 0.12736, 0.09020 ],
[ 52, -131.8, 1.273415, 0.10813, 0.12506 ],
[ 53, -138.5, 1.080809, 0.09414, 0.15741 ],
[ 54, -145.1, 0.957076, 0.03249, 0.18958 ],
[ 55, -152.0, 0.868976, 0.07206, 0.24109 ],
[ 56, -163.4, 0.771731, 0.05787, 0.30378 ],
[ 60, -177.2, 0.697108, 0.04353, 0.35696 ],
[ 61, 171.6, 0.655803, 0.03291, 0.41971 ],
[ 62, 152.4, 0.623958, 0.02240, 0.49954 ],
[ 63, 148.4, 0.596037, 0.01196, 0.60321 ],
[ 64, 136.8, 0.607413, 0.00425, 0.73542 ],
[ 65, 125.4, 0.659923, 0.01099, 0.83391 ],
[ 66, 114.2, 0.859517, 0.08050, 0.77474 ],
[ 70, 103.2, 1.195683, 0.20259, 0.70460 ],
[ 71, 93.2, 1.407534, 0.28807, 0.65230 ],
[ 72, 84.2, 1.532829, 0.34422, 0.61930 ],
[ 73, 77.3, 1.603792, 0.37838, 0.59533 ],
[ 74, 71.6, 1.649448, 0.40290, 0.57716 ],
[ 75, 66.9, 1.681080, 0.42141, 0.56222 ],
[ 76, 62.8, 1.704979, 0.43647, 0.54895 ]
];
/**
Coloroid table source
Some negative angle typos are fixed.
Angle typo on the A=62 is fixed.
xλ typo on A=73 is fixed.
Beware, tg/ctg values don’t agree with angle.
Also don’t trust the calculated eλ = xλ + yλ + zλ.
Also, unfortunately, some values might be wrong, as coloroid range looks uneven.
A λ ф tg ф ctg ф xλ yλ zλ xλ yλ eλ
10 570.83 59.0 0.6009 0.775745 0.946572 0.002032 0.44987 0.54895 1.724349
11 572.64 55.3 0.6924 0.805130 0.933804 0.001910 0.46248 0.53641 1.740845
12 574.38 51.7 0.7898 0.832782 0.920395 0.001808 0.47451 0.52444 1.754986
13 576.06 48.2 1.1180 0.8941 0.858841 0.906482 0.001764 0.48601 0.51298 1.767088
14 577.50 44.8 0.9330 1.0070 0.880488 0.893741 0.001724 0.49578 0.50325 1.775953
15 579.31 41.5 0.8847 0.906652 0.876749 0.001672 0.50790 0.49052 1.785074
16 580.95 38.2 0.7869 0.929124 0.860368 0.001612 0.51874 0.43035 1.791104
20 582.65 34.9 0.6976 0.950909 0.842391 0.001531 0.52980 0.46934 1.794831
21 584.46 31.5 0.6128 0.972454 0.824779 0.001431 0.54137 0.45783 1.798665
22 586.43 28.0 0.5317 0.993753 0.799758 0.001308 0.55367 0.44559 1.794822
23 588.59 24.4 0.4536 1.014350 0.774090 0.001170 0.56680 0.43253 1.789610
24 591.06 20.6 0.3759 1.034402 0.774014 0.001067 0.58128 0.41811 1.779484
25 594.00 16.6 0.2974 1.052466 0.707496 0.001021 0.59766 0.40176 1.760984
26 597.74 12.3 0.2180 1.062544 0.660001 0.000898 0.61653 0.38300 1.723444
30 602.72 7.7 0.1352 1.056125 0.596070 0.000696 0.63896 0.36061 1.652892
31 610.14 2.8 0.0489 1.001027 0.501245 0.000335 0.66619 0.33358 1.502608
32 625.00 -2.5 -0.0435 0.751400 0.321000 0.000100 0.70061 0.29930 1.072500
33 -492.79 -8.4 -0.1477 0.726603 0.304093 0.105941 0.63925 0.26753 1.136638
34 -495.28 -19.8 -0.3600 0.689620 0.278886 0.263780 0.53962 0.22631 1.232286
35 -498.45 -31.6 -0.6152 0.659523 0.258373 0.392224 0.50340 0.19721 1.310122
40 -502.69 -43.2 -0.9391 0.633815 0.240851 0.501944 0.46041 0.17495 1.376610
41 -509.12 -54.6 -0.7107 0.609810 0.224490 0.604392 0.42386 0.15603 1.438692
42 -520.40 -65.8 -0.4494 0.585492 0.207915 0.708175 0.38991 0.13846 1.501583
43 -536.31 -76.8 -0.2345 0.558865 0.189767 0.821815 0.35586 0.12083 1.570447
44 -548.11 -86.8 -0.0559 0.529811 0.169965 0.945807 0.32195 0.10328 1.645584
45 -555.96 -95.8 -0.1016 0.496364 0.147168 1.088551 0.28657 0.08496 1.732085
46 -564.18 -108.4 0.3327 0.425346 0.098764 1.391643 0.22202 0.05155 1.915754
50 450.00 -117.2 0.5141 0.336200 0.038000 1.772110 0.15664 0.01771 2.146310
51 468.71 -124.7 0.6924 0.210174 0.086198 1.353567 0.12736 0.05227 1.649940
52 475.44 -131.8 0.8941 0.137734 0.114770 1.020911 0.10813 0.09020 1.273415
53 479.00 -138.5 0.8847 0.101787 0.135067 0.843955 0.09414 0.12506 1.080809
54 482.04 -145.1 0.6976 0.079004 0.150709 0.727363 0.03249 0.15741 0.957577
55 484.29 -152.0 0.5317 0.062658 0.164626 0.641692 0.07206 0.18958 0.868977
56 487.31 -163.4 0.2981 0.044691 0.185949 0.541091 0.05787 0.24109 0.771732
60 490.40 -177.2 0.0489 0.030372 0.211659 0.455077 0.04353 0.30378 0.697110
61 492.72 171.6 -0.1477 0.021655 0.234022 0.400126 0.03291 0.35696 0.655804
62 495.28 125.4 -0.3600 0.013989 0.261843 0.348126 0.02240 0.41971 0.623969
63 498.45 148.4 -0.6152 0.007215 0.301137 0.287685 0.01196 0.49954 0.596037
64 502.69 136.8 -0.9391 -1.0650 0.002586 0.366425 0.238402 0.00425 0.60321 0.607414
65 509.12 125.4 -1.4070 -0.7107 0.007260 0.485346 0.167317 0.01099 0.73542 0.659924
66 520.40 114.2 -0.4494 0.066010 0.717274 0.076233 0.08050 0.83391 0.859523
70 536.31 103.2 -0.2345 0.242272 0.926325 0.027086 0.20259 0.77474 1.195684
71 548.11 93.2 -0.0559 0.406663 0.990587 0.010284 0.28807 0.70460 1.410097
72 555.96 84.2 0.1016 0.527646 0.999862 0.005321 0.34422 0.65230 1.532830
73 560.74 77.3 0.2254 0.606873 0.993224 0.003695 0.37838 0.61930 1.603793
74 564.18 71.6 0.3327 0.664599 0.981981 0.002868 0.40290 0.59533 1.649449
75 566.78 66.9 0.4265 0.708358 0.970252 0.002470 0.42141 0.57716 1.681081
76 568.92 62.8 0.5140 0.744182 0.958592 0.002205 0.43647 0.56222 1.704981
*/
/** Create angle-sorted table */
var table = coloroid.table;
var angleTable = [].concat(table.slice(-13),table.slice(0, -13));
/**
* Some precalculations
* 2° D65 whitepoint is used
*/
var i = 'D65';
var o = 2;
var Xn = xyz.whitepoint[o][i][0];
var Yn = xyz.whitepoint[o][i][1];
var Zn = xyz.whitepoint[o][i][2];
var y0 = Xn / (Xn + Yn + Zn);
var x0 = Yn / (Xn + Yn + Zn);
var ew = (Xn + Yn + Zn) / 100;
/**
* From xyY to coloroid
*
* @param {Array} arg xyY tuple
*
* @return {Array} ATV coloroid channels
*/
xyy.coloroid = function (arg) {
var x = arg[0], y = arg[1], Y = arg[2];
//coloroid luminocity is the same as hunter-lab lightness (the easier part)
var V = 10 * Math.sqrt(Y);
//get the hue angle, -π ... +π
var angle = Math.atan2(y - y0, x - x0) * 180 / Math.PI;
var row;
//find the closest row in the table
var prev = angleTable.length - 1;
for (var i = 0; i < angleTable.length; i++) {
if (angle > angleTable[i][1]) {
break;
}
prev = i;
}
//round instead of ceil
row = Math.abs(angleTable[i+1][1] - angle) > Math.abs(angleTable[prev][1] - angle) ? angleTable[i+1] : angleTable[prev];
//get hue id
var A = row[0];
//calc saturation
var yl = row[4], el = row[2], xl = row[3];
//yl should be scaled to 0..100;
var Yl = yl * el * 100;
var T = 100 * Y*(x0*ew - x*ew) / (100*(x*el - xl*el) + Yl*(x0*ew - x*ew));
// var T = 100 * Y*(1 - y*ew) / (100*(y*el - yl*el) + Yl*(1 - y*ew));
return [A, T, V];
};
/**
* Backwise - from coloroid to xyY
*
* @param {Array} arg Coloroid values
*
* @return {Array} xyY values
*/
coloroid.xyy = function (arg) {
var A = arg[0], T = arg[1], V = arg[2];
//find the closest row in the table
var row;
for (var i = 0; i < table.length; i++) {
if (A <= table[i][0]) {
row = table[i];
break;
}
}
var yl = row[4], el = row[2], xl = row[3];
var Y = V*V / 100;
var Yl = yl * el * 100;
var x = (100*Y*x0*ew + 100*xl*el*T - Yl*T*x0*ew) / (100*T*el - Yl*T*ew + 100*Y*ew);
var y = (100*Y + 100*T*yl*el - Yl*T) / (Y*ew*100 + T*100*el - T*Yl*ew);
// var x = (100*Y*ew*x0 + 100*T*el*xl - T*Yl*ew*x0) / (100*T*el - T*Yl*ew + 100*Y*ew);
// var y = 100*Y / (100*T*el + 100*T*ew*Yl + 100*ew*Y);
// var x = (ew*x0*(V*V - 100*T*row[6]) + 100*T*el*xl) / (ew*(V*V - 100*T*row[6]) + 100*T*el);
// var y = V*V/(ew*(V*V + 100*T*row[6]) + 100*T*el);
return [x,y,Y];
};
/** Proper transformation to a XYZ (via xyY) */
xyz.coloroid = function (arg) {
return xyy.coloroid(xyz.xyy(arg));
};
coloroid.xyz = function (arg) {
return xyy.xyz(coloroid.xyy(arg));
};
module.exports = coloroid;

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node_modules/color-space/cubehelix.js generated vendored Normal file
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/**
* Cubehelix http://astron-soc.in/bulletin/11June/289392011.pdf
*
* @module color-space/cubehelix
*/
'use strict'
var rgb = require('./rgb');
var clamp = require('mumath/clamp');
var cubehelix = module.exports = {
name: 'cubehelix',
channel: ['fraction'],
min: [0],
max: [1]
};
/** Default options for space */
var defaults = cubehelix.defaults = {
//0..3
start: 0,
//-10..10
rotation: 0.5,
//0..1+
hue: 1,
//0..2
gamma: 1
};
/**
* Transform cubehelix level to RGB
*
* @param {Number} fraction 0..1 cubehelix level
* @param {Object} options Mapping options, overrides defaults
*
* @return {Array} rgb tuple
*/
cubehelix.rgb = function(fraction, options) {
options = options || {};
if (fraction.length) fraction = fraction[0];
var start = options.start !== undefined ? options.start : defaults.start;
var rotation = options.rotation !== undefined ? options.rotation : defaults.rotation;
var gamma = options.gamma !== undefined ? options.gamma : defaults.gamma;
var hue = options.hue !== undefined ? options.hue : defaults.hue;
var angle = 2 * Math.PI * (start/3 + 1.0 + rotation * fraction);
fraction = Math.pow(fraction, gamma);
var amp = hue * fraction * (1-fraction)/2.0;
var r = fraction + amp*(-0.14861*Math.cos(angle)+1.78277*Math.sin(angle));
var g = fraction + amp*(-0.29227*Math.cos(angle)-0.90649*Math.sin(angle));
var b = fraction + amp*(+1.97294*Math.cos(angle));
r = clamp(r, 0, 1);
g = clamp(g, 0, 1);
b = clamp(b, 0, 1);
return [r * 255, g * 255, b * 255];
};
/**
* RGB to cubehelix
*
* @param {Array} rgb RGB values
*
* @return {Array} cubehelix fraction(s)
*/
rgb.cubehelix = function(rgb) {
//TODO - there is no backwise conversion yet
};

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/**
* @module color-space/hcg
*/
'use strict'
var rgb = require('./rgb');
var hsl = require('./hsl');
var hsv = require('./hsv');
var hwb = require('./hwb');
var mod = require('mumath/mod');
module.exports = {
name: 'hcg',
min: [0,0,0],
max: [360,100,100],
channel: ['hue', 'chroma', 'gray'],
alias: ['HCG', 'HSG'],
rgb: function(hcg) {
var h = hcg[0] / 360;
var c = hcg[1] / 100;
var g = hcg[2] / 100;
if (c === 0.0) {
return [g * 255, g * 255, g * 255];
}
var hi = mod(h, 1) * 6;
var v = mod(hi, 1);
var pure = [0, 0, 0];
var w = 1 - v;
switch (Math.floor(hi)) {
case 0:
pure[0] = 1; pure[1] = v; pure[2] = 0; break;
case 1:
pure[0] = w; pure[1] = 1; pure[2] = 0; break;
case 2:
pure[0] = 0; pure[1] = 1; pure[2] = v; break;
case 3:
pure[0] = 0; pure[1] = w; pure[2] = 1; break;
case 4:
pure[0] = v; pure[1] = 0; pure[2] = 1; break;
default:
pure[0] = 1; pure[1] = 0; pure[2] = w;
}
var mg = (1.0 - c) * g;
var rgb = [
(c * pure[0] + mg) * 255,
(c * pure[1] + mg) * 255,
(c * pure[2] + mg) * 255
];
return rgb;
},
hsl: function(hcg) {
var c = hcg[1] / 100;
var g = hcg[2] / 100;
var l = g * (1.0 - c) + 0.5 * c;
var s = 0;
if (l < 1.0 && l > 0.0) {
if (l < 0.5) {
s = c / (2 * l);
} else {
s = c / (2 * (1 - l));
}
}
return [hcg[0], s * 100, l * 100];
},
hsv: function(hcg){
var c = hcg[1] / 100;
var g = hcg[2] / 100;
var v = c + g * (1.0 - c);
var res;
if (v > 0.0) {
var f = c / v;
res = [hcg[0], f * 100, v * 100];
} else {
res = [hcg[0], 0, v * 100];
}
return res;
},
hwb: function(hcg){
var c = hcg[1] / 100;
var g = hcg[2] / 100;
var v = c + g * (1.0 - c);
return [hcg[0], (v - c) * 100, (1 - v) * 100];
}
};
//append rgb
rgb.hcg = function(rgb) {
var r = rgb[0] / 255;
var g = rgb[1] / 255;
var b = rgb[2] / 255;
var max = Math.max(Math.max(r, g), b);
var min = Math.min(Math.min(r, g), b);
var chroma = (max - min);
var grayscale;
var hue;
if (chroma < 1) {
grayscale = min / (1 - chroma);
} else {
grayscale = 0;
}
if (chroma > 0) {
if (max === r) {
hue = mod((g - b) / chroma, 6);
} else
if (max === g) {
hue = 2 + (b - r) / chroma;
} else {
hue = 4 + (r - g) / chroma;
}
hue /= 6;
hue = mod(hue, 1);
} else {
hue = 0;
}
return [hue * 360, chroma * 100, grayscale * 100];
};
//extend hsl
hsl.hcg = function(hsl) {
var s = hsl[1] / 100;
var l = hsl[2] / 100;
var c = 0;
if (l < 0.5) {
c = 2.0 * s * l;
} else {
c = 2.0 * s * (1.0 - l);
}
var res;
if (c < 1.0) {
var f = (l - 0.5 * c) / (1.0 - c);
res = [hsl[0], c * 100, f * 100];
} else {
res = [hsl[0], c * 100, 0];
}
return res;
};
//extend hsv
hsv.hcg = function(hsv){
var s = hsv[1] / 100;
var v = hsv[2] / 100;
var c = s * v;
var res;
if (c < 1.0) {
var f = (v - c) / (1 - c);
res = [hsv[0], c * 100, f * 100];
} else {
res = [hsv[0], c * 100, 0];
}
return res;
}
//extend hwb
hwb.hcg = function(hwb){
var w = hwb[1] / 100;
var b = hwb[2] / 100;
var v = 1 - b;
var c = v - w;
var g = 0;
if (c < 1) {
g = (v - c) / (1 - c);
}
return [hwb[0], c * 100, g * 100];
}

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node_modules/color-space/hcy.js generated vendored Normal file
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/**
* HSV optimized for shaders
* http://chilliant.blogspot.ca/2012/08/rgbhcy-in-hlsl.html
*
* @module color-space/hcy
*/
'use strict'
var rgb = require('./rgb');
var loop = require('mumath/mod');
var clamp = require('mumath/clamp');
var hcy = module.exports = {
name: 'hcy',
min: [0,0,0],
max: [360,100,255],
channel: ['hue', 'chroma', 'luminance'],
alias: ['HCY']
};
/**
* HCY to RGB
*
* @param {Array} hcy Channel values
*
* @return {Array} RGB channel values
*/
hcy.rgb = function (hcy) {
var h = loop(hcy[0], 0, 360) * Math.PI / 180;
var s = clamp(hcy[1], 0, 100) / 100;
var i = clamp(hcy[2], 0, 255) / 255;
var pi3 = Math.PI / 3;
var r, g, b;
if (h < (2 * pi3) ) {
b = i * ( 1 - s );
r = i * (1 + ( s * Math.cos(h) / Math.cos(pi3 - h) ));
g = i * (1 + ( s * ( 1 - Math.cos(h) / Math.cos(pi3 - h) )));
}
else if (h < (4 * pi3) ) {
h = h - 2 * pi3;
r = i * ( 1 - s );
g = i * (1 + ( s * Math.cos(h) / Math.cos(pi3 - h) ));
b = i * (1 + ( s * ( 1 - Math.cos(h) / Math.cos(pi3 - h) )));
}
else {
h = h - 4 * pi3;
g = i * ( 1 - s );
b = i * (1 + ( s * Math.cos(h) / Math.cos(pi3 - h) ));
r = i * (1 + ( s * ( 1 - Math.cos(h) / Math.cos(pi3 - h) )));
}
return [r * 255, g * 255, b * 255];
};
/**
* RGB to HCY
*
* @param {Array} rgb Channel values
*
* @return {Array} HCY channel values
*/
rgb.hcy = function (rgb) {
var sum = rgb[0] + rgb[1] + rgb[2];
var r = rgb[0] / sum;
var g = rgb[1] / sum;
var b = rgb[2] / sum;
var h = Math.acos(
( 0.5 * ((r - g) + (r - b)) ) /
Math.sqrt( (r - g)*(r - g) + (r - b)*(g - b) )
);
if (b > g) {
h = 2 * Math.PI - h;
}
var s = 1 - 3 * Math.min(r, g, b);
var i = sum / 3;
return [h * 180 / Math.PI, s * 100, i];
};

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node_modules/color-space/hpluv.js generated vendored Normal file
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/**
* A uniform wrapper for hpluv.
* // http://www.hsluv.org/
*
* @module color-space/hpluv
*/
'use strict'
var xyz = require('./xyz');
var lchuv = require('./lchuv');
var _hsluv = require('hsluv');
module.exports = {
name: 'hpluv',
min: [0,0,0],
max: [360,100,100],
channel: ['hue', 'saturation', 'lightness'],
alias: ['HPLuv', 'HuSLp'],
lchuv: _hsluv.hpluvToLch,
xyz: function(arg){return lchuv.xyz(_hsluv.hpluvToLch(arg));},
//a shorter way to convert to husl
hsluv: function(arg){
return _hsluv.lchToHsluv( _hsluv.hpluvToLch(arg));
}
};
//extend lchuv, xyz
lchuv.hpluv = _hsluv.lchToHpluv;
xyz.hpluv = function(arg){return _hsluv.lchToHpluv(xyz.lchuv(arg));};

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/**
* http://www.cse.usf.edu/~mshreve/rgb-to-hsi
* http://web.archive.org/web/20130124054245/http://web2.clarkson.edu/class/image_process/RGB_to_HSI.pdf
*
* @module color-space/hsl
*/
'use strict'
var rgb = require('./rgb');
var loop = require('mumath/mod');
var clamp = require('mumath/clamp');
var hsi = module.exports = {
name: 'hsi',
min: [0,0,0],
max: [360,100,255],
channel: ['hue', 'saturation', 'intensity'],
alias: ['HSI']
};
/**
* HSI to RGB
*
* @param {Array} hsi Channel values
*
* @return {Array} RGB channel values
*/
hsi.rgb = function (hsi) {
var h = loop(hsi[0], 0, 360) * Math.PI / 180;
var s = clamp(hsi[1], 0, 100) / 100;
var i = clamp(hsi[2], 0, 255) / 255;
var pi3 = Math.PI / 3;
var r, g, b;
if (h < (2 * pi3) ) {
b = i * ( 1 - s );
r = i * (1 + ( s * Math.cos(h) / Math.cos(pi3 - h) ));
g = i * (1 + ( s * ( 1 - Math.cos(h) / Math.cos(pi3 - h) )));
}
else if (h < (4 * pi3) ) {
h = h - 2 * pi3;
r = i * ( 1 - s );
g = i * (1 + ( s * Math.cos(h) / Math.cos(pi3 - h) ));
b = i * (1 + ( s * ( 1 - Math.cos(h) / Math.cos(pi3 - h) )));
}
else {
h = h - 4 * pi3;
g = i * ( 1 - s );
b = i * (1 + ( s * Math.cos(h) / Math.cos(pi3 - h) ));
r = i * (1 + ( s * ( 1 - Math.cos(h) / Math.cos(pi3 - h) )));
}
return [r * 255, g * 255, b * 255];
};
/**
* RGB to HSI
*
* @param {Array} rgb Channel values
*
* @return {Array} HSI channel values
*/
rgb.hsi = function (rgb) {
var sum = rgb[0] + rgb[1] + rgb[2];
var r = rgb[0] / sum;
var g = rgb[1] / sum;
var b = rgb[2] / sum;
var h = Math.acos(
( 0.5 * ((r - g) + (r - b)) ) /
Math.sqrt( (r - g)*(r - g) + (r - b)*(g - b) )
);
if (b > g) {
h = 2 * Math.PI - h;
}
var s = 1 - 3 * Math.min(r, g, b);
var i = sum / 3;
return [h * 180 / Math.PI, s * 100, i];
};

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/**
* @module color-space/hsl
*/
'use strict'
var rgb = require('./rgb');
module.exports = {
name: 'hsl',
min: [0,0,0],
max: [360,100,100],
channel: ['hue', 'saturation', 'lightness'],
alias: ['HSL'],
rgb: function(hsl) {
var h = hsl[0] / 360,
s = hsl[1] / 100,
l = hsl[2] / 100,
t1, t2, t3, rgb, val;
if (s === 0) {
val = l * 255;
return [val, val, val];
}
if (l < 0.5) {
t2 = l * (1 + s);
}
else {
t2 = l + s - l * s;
}
t1 = 2 * l - t2;
rgb = [0, 0, 0];
for (var i = 0; i < 3; i++) {
t3 = h + 1 / 3 * - (i - 1);
if (t3 < 0) {
t3++;
}
else if (t3 > 1) {
t3--;
}
if (6 * t3 < 1) {
val = t1 + (t2 - t1) * 6 * t3;
}
else if (2 * t3 < 1) {
val = t2;
}
else if (3 * t3 < 2) {
val = t1 + (t2 - t1) * (2 / 3 - t3) * 6;
}
else {
val = t1;
}
rgb[i] = val * 255;
}
return rgb;
}
};
//extend rgb
rgb.hsl = function(rgb) {
var r = rgb[0]/255,
g = rgb[1]/255,
b = rgb[2]/255,
min = Math.min(r, g, b),
max = Math.max(r, g, b),
delta = max - min,
h, s, l;
if (max === min) {
h = 0;
}
else if (r === max) {
h = (g - b) / delta;
}
else if (g === max) {
h = 2 + (b - r) / delta;
}
else if (b === max) {
h = 4 + (r - g)/ delta;
}
h = Math.min(h * 60, 360);
if (h < 0) {
h += 360;
}
l = (min + max) / 2;
if (max === min) {
s = 0;
}
else if (l <= 0.5) {
s = delta / (max + min);
}
else {
s = delta / (2 - max - min);
}
return [h, s * 100, l * 100];
};

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/**
* A uniform wrapper for hsluv.
* // http://www.hsluv.org/
*
* @module color-space/hsluv
*/
'use strict'
var xyz = require('./xyz');
var lchuv = require('./lchuv');
var _hsluv = require('hsluv');
module.exports = {
name: 'hsluv',
min: [0,0,0],
max: [360,100,100],
channel: ['hue', 'saturation', 'lightness'],
alias: ['HSLuv', 'HuSL'],
lchuv: _hsluv.hsluvToLch,
xyz: function(arg){
return lchuv.xyz(_hsluv.hsluvToLch(arg));
},
//a shorter way to convert to hpluv
hpluv: function(arg){
return _hsluv.lchToHpluv( _hsluv.hsluvToLch(arg));
}
};
//extend lchuv, xyz
lchuv.hsluv = _hsluv.lchToHsluv;
xyz.hsluv = function(arg){
return _hsluv.lchToHsluv(xyz.lchuv(arg));
};

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/**
* @module color-space/hsp
*/
'use strict'
var rgb = require('./rgb'),
Pr = 0.299,
Pg = 0.587,
Pb = 0.114;
module.exports = {
name: 'hsp',
min: [0, 0, 0],
max: [360, 100, 255],
channel: ['hue', 'saturation', 'perceived_brightness'],
alias: ['HSP'],
rgb: function (hsp) {
var h = hsp[0]/360.0,
s = hsp[1]/100.0,
p = hsp[2],
r, g, b, part,
minOverMax = 1.0 - s;
if (minOverMax > 0.0) {
if (h < 1.0 / 6.0) { // R>G>B
h = 6.0 * (h - 0.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
b = p / Math.sqrt(Pr / minOverMax / minOverMax + Pg * part * part + Pb);
r = (b) / minOverMax;
g = (b) + h * ((r) - (b));
} else if (h < 2.0 / 6.0) { // G>R>B
h = 6.0 * (-h + 2.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
b = p / Math.sqrt(Pg / minOverMax / minOverMax + Pr * part * part + Pb);
g = (b) / minOverMax;
r = (b) + h * ((g) - (b));
} else if (h < 3.0 / 6.0) { // G>B>R
h = 6.0 * (h - 2.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
r = p / Math.sqrt(Pg / minOverMax / minOverMax + Pb * part * part + Pr);
g = (r) / minOverMax;
b = (r) + h * ((g) - (r));
} else if (h < 4.0 / 6.0) { // B>G>R
h = 6.0 * (-h + 4.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
r = p / Math.sqrt(Pb / minOverMax / minOverMax + Pg * part * part + Pr);
b = (r) / minOverMax;
g = (r) + h * ((b) - (r));
} else if (h < 5.0 / 6.0) { // B>R>G
h = 6.0 * (h - 4.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
g = p / Math.sqrt(Pb / minOverMax / minOverMax + Pr * part * part + Pg);
b = (g) / minOverMax;
r = (g) + h * ((b) - (g));
} else { // R>B>G
h = 6.0 * (-h + 6.0 / 6.0);
part = 1.0 + h * (1.0 / minOverMax - 1.0);
g = p / Math.sqrt(Pr / minOverMax / minOverMax + Pb * part * part + Pg);
r = (g) / minOverMax;
b = (g) + h * ((r) - (g));
}
} else {
if (h < 1.0 / 6.0) { // R>G>B
h = 6.0 * (h - 0.0 / 6.0);
r = Math.sqrt(p * p / (Pr + Pg * h * h));
g = (r) * h;
b = 0.0;
} else if (h < 2.0 / 6.0) { // G>R>B
h = 6.0 * (-h + 2.0 / 6.0);
g = Math.sqrt(p * p / (Pg + Pr * h * h));
r = (g) * h;
b = 0.0;
} else if (h < 3.0 / 6.0) { // G>B>R
h = 6.0 * (h - 2.0 / 6.0);
g = Math.sqrt(p * p / (Pg + Pb * h * h));
b = (g) * h;
r = 0.0;
} else if (h < 4.0 / 6.0) { // B>G>R
h = 6.0 * (-h + 4.0 / 6.0);
b = Math.sqrt(p * p / (Pb + Pg * h * h));
g = (b) * h;
r = 0.0;
} else if (h < 5.0 / 6.0) { // B>R>G
h = 6.0 * (h - 4.0 / 6.0);
b = Math.sqrt(p * p / (Pb + Pr * h * h));
r = (b) * h;
g = 0.0;
} else { // R>B>G
h = 6.0 * (-h + 6.0 / 6.0);
r = Math.sqrt(p * p / (Pr + Pb * h * h));
b = (r) * h;
g = 0.0;
}
}
return [Math.round(r), Math.round(g), Math.round(b)];
}
};
//append rgb
rgb.hsp = function (rgb) {
var r = parseInt(rgb[0], 10),
g = parseInt(rgb[1], 10),
b = parseInt(rgb[2], 10),
h, s, p;
// Calculate the Perceived brightness
p = Math.sqrt(r * r * Pr + g * g * Pg + b * b * Pb);
// Calculate the Hue and Saturation
if (r === g && r === b) {
h = 0.0;
s = 0.0;
} else {
// R is largest
if (r >= g && r >= b) {
if (b >= g) {
h = 6.0 / 6.0 - 1.0 / 6.0 * (b - g) / (r - g);
s = 1.0 - g / r;
} else {
h = 0.0 / 6.0 + 1.0 / 6.0 * (g - b) / (r - b);
s = 1.0 - b / r;
}
}
// G is largest
if (g >= r && g >= b) {
if (r >= b) {
h = 2.0 / 6.0 - 1.0 / 6.0 * (r - b) / (g - b);
s = 1 - b / g;
} else {
h = 2.0 / 6.0 + 1.0 / 6.0 * (b - r) / (g - r);
s = 1.0 - r / g;
}
}
// B is largest
if (b >= r && b >= g) {
if (g >= r) {
h = 4.0 / 6.0 - 1.0 / 6.0 * (g - r) / (b - r);
s = 1.0 - r / b;
} else {
h = 4.0 / 6.0 + 1.0 / 6.0 * (r - g) / (b - g);
s = 1.0 - g / b;
}
}
}
return [Math.round(h*360.0), s*100.0, Math.round(p)];
};

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node_modules/color-space/hsv.js generated vendored Normal file
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/**
* @module color-space/hsv
*/
'use strict'
var rgb = require('./rgb');
var hsl = require('./hsl');
module.exports = {
name: 'hsv',
min: [0,0,0],
max: [360,100,100],
channel: ['hue', 'saturation', 'value'],
alias: ['HSV', 'HSB'],
rgb: function(hsv) {
var h = hsv[0] / 60,
s = hsv[1] / 100,
v = hsv[2] / 100,
hi = Math.floor(h) % 6;
var f = h - Math.floor(h),
p = 255 * v * (1 - s),
q = 255 * v * (1 - (s * f)),
t = 255 * v * (1 - (s * (1 - f)));
v *= 255;
switch(hi) {
case 0:
return [v, t, p];
case 1:
return [q, v, p];
case 2:
return [p, v, t];
case 3:
return [p, q, v];
case 4:
return [t, p, v];
case 5:
return [v, p, q];
}
},
hsl: function(hsv) {
var h = hsv[0],
s = hsv[1] / 100,
v = hsv[2] / 100,
sl, l;
l = (2 - s) * v;
sl = s * v;
sl /= (l <= 1) ? l : 2 - l;
sl = sl || 0;
l /= 2;
return [h, sl * 100, l * 100];
}
};
//append rgb
rgb.hsv = function(rgb) {
var r = rgb[0],
g = rgb[1],
b = rgb[2],
min = Math.min(r, g, b),
max = Math.max(r, g, b),
delta = max - min,
h, s, v;
if (max === 0) {
s = 0;
}
else {
s = (delta/max * 100);
}
if (max === min) {
h = 0;
}
else if (r === max) {
h = (g - b) / delta;
}
else if (g === max) {
h = 2 + (b - r) / delta;
}
else if (b === max) {
h = 4 + (r - g) / delta;
}
h = Math.min(h * 60, 360);
if (h < 0) {
h += 360;
}
v = ((max / 255) * 1000) / 10;
return [h, s, v];
};
//extend hsl
hsl.hsv = function(hsl) {
var h = hsl[0],
s = hsl[1] / 100,
l = hsl[2] / 100,
sv, v;
l *= 2;
s *= (l <= 1) ? l : 2 - l;
v = (l + s) / 2;
sv = (2 * s) / (l + s) || 0;
return [h, sv * 100, v * 100];
};

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/**
* @module color-space/hwb
*/
'use strict'
var rgb = require('./rgb');
var hsv = require('./hsv');
var hsl = require('./hsl');
var hwb = module.exports = {
name: 'hwb',
min: [0,0,0],
max: [360,100,100],
channel: ['hue', 'whiteness', 'blackness'],
alias: ['HWB'],
// http://dev.w3.org/csswg/css-color/#hwb-to-rgb
rgb: function(hwb) {
var h = hwb[0] / 360,
wh = hwb[1] / 100,
bl = hwb[2] / 100,
ratio = wh + bl,
i, v, f, n;
var r, g, b;
// wh + bl cant be > 1
if (ratio > 1) {
wh /= ratio;
bl /= ratio;
}
i = Math.floor(6 * h);
v = 1 - bl;
f = 6 * h - i;
//if it is even
if ((i & 0x01) !== 0) {
f = 1 - f;
}
n = wh + f * (v - wh); // linear interpolation
switch (i) {
default:
case 6:
case 0: r = v; g = n; b = wh; break;
case 1: r = n; g = v; b = wh; break;
case 2: r = wh; g = v; b = n; break;
case 3: r = wh; g = n; b = v; break;
case 4: r = n; g = wh; b = v; break;
case 5: r = v; g = wh; b = n; break;
}
return [r * 255, g * 255, b * 255];
},
// http://alvyray.com/Papers/CG/HWB_JGTv208.pdf
hsv: function(arg){
var h = arg[0], w = arg[1], b = arg[2], s, v;
//if w+b > 100% - take proportion (how many times )
if (w + b >= 100){
s = 0;
v = 100 * w/(w+b);
}
//by default - take wiki formula
else {
s = 100-(w/(1-b/100));
v = 100-b;
}
return [h, s, v];
},
hsl: function(arg){
return hsv.hsl(hwb.hsv(arg));
}
};
//extend rgb
rgb.hwb = function(val) {
var r = val[0],
g = val[1],
b = val[2],
h = rgb.hsl(val)[0],
w = 1/255 * Math.min(r, Math.min(g, b));
b = 1 - 1/255 * Math.max(r, Math.max(g, b));
return [h, w * 100, b * 100];
};
//keep proper hue on 0 values (conversion to rgb loses hue on zero-lightness)
hsv.hwb = function(arg){
var h = arg[0], s = arg[1], v = arg[2];
return [h, v === 0 ? 0 : (v * (1-s/100)), 100 - v];
};
//extend hsl with proper conversions
hsl.hwb = function(arg){
return hsv.hwb(hsl.hsv(arg));
};

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/**
* Color space data and conversions
*
* @module color-space
*
*/
'use strict';
/** Exported spaces */
var spaces = {
rgb: require('./rgb'),
hsl: require('./hsl'),
hsv: require('./hsv'),
hsi: require('./hsi'),
hwb: require('./hwb'),
cmyk: require('./cmyk'),
cmy: require('./cmy'),
xyz: require('./xyz'),
xyy: require('./xyy'),
yiq: require('./yiq'),
yuv: require('./yuv'),
ydbdr: require('./ydbdr'),
ycgco: require('./ycgco'),
ypbpr: require('./ypbpr'),
ycbcr: require('./ycbcr'),
xvycc: require('./xvycc'),
yccbccrc: require('./yccbccrc'),
ucs: require('./ucs'),
uvw: require('./uvw'),
jpeg: require('./jpeg'),
lab: require('./lab'),
labh: require('./labh'),
lms: require('./lms'),
lchab: require('./lchab'),
luv: require('./luv'),
lchuv: require('./lchuv'),
hsluv: require('./hsluv'),
hpluv: require('./hpluv'),
cubehelix: require('./cubehelix'),
coloroid: require('./coloroid'),
hcg: require('./hcg'),
hcy: require('./hcy'),
tsl: require('./tsl'),
yes: require('./yes'),
osaucs: require('./osaucs'),
hsp: require('./hsp')
};
//build absent convertors from each to every space
var fromSpace;
for (var fromSpaceName in spaces) {
fromSpace = spaces[fromSpaceName];
for (var toSpaceName in spaces) {
if (!fromSpace[toSpaceName]) fromSpace[toSpaceName] = getConvertor(fromSpaceName, toSpaceName);
}
}
/** return converter through xyz/rgb space */
function getConvertor(fromSpaceName, toSpaceName){
var fromSpace = spaces[fromSpaceName];
//create straight converter
if (fromSpaceName === toSpaceName) {
return function (a) {
return a;
};
}
//create xyz converter, if available
else if (fromSpace.xyz && spaces.xyz[toSpaceName]) {
return function(arg){
return spaces.xyz[toSpaceName](fromSpace.xyz(arg));
};
}
//create rgb converter
else if (fromSpace.rgb && spaces.rgb[toSpaceName]) {
return function(arg){
return spaces.rgb[toSpaceName](fromSpace.rgb(arg));
};
}
}
module.exports = spaces;

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/**
* https://en.wikipedia.org/wiki/YCbCr#JPEG_conversion
*
* JPEG conversion without head/footroom
*
* @module color-space/jpeg
*/
'use strict'
var rgb = require('./rgb');
var jpeg = module.exports = {
name: 'jpeg',
min: [0, 0, 0],
max: [255, 255, 255],
channel: ['Y','Cb','Cr'],
alias: ['JPEG']
};
/**
* JPEG to RGB
* transform through analog form
*
* @param {Array} jpeg RGB values
*
* @return {Array} JPEG values
*/
jpeg.rgb = function (arr) {
var y = arr[0], cb = arr[1], cr = arr[2];
return [
y + 1.402 * (cr - 128),
y - 0.34414 * (cb - 128) - 0.71414 * (cr - 128),
y + 1.772 * (cb - 128)
]
};
/**
* RGB to JPEG
* transform through analog form
*
* @param {Array} jpeg JPEG values
*
* @return {Array} RGB values
*/
rgb.jpeg = function(arr) {
var r = arr[0], g = arr[1], b = arr[2];
return [
0.299 * r + 0.587 * g + 0.114 * b,
128 - 0.168736 * r - 0.331264 * g + 0.5 * b,
128 + 0.5 * r - 0.418688 * g - 0.081312 * b
]
};

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node_modules/color-space/lab.js generated vendored Normal file
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/**
* CIE LAB space model
*
* @module color-space/lab
*/
'use strict'
var xyz = require('./xyz');
module.exports = {
name: 'lab',
min: [0,-100,-100],
max: [100,100,100],
channel: ['lightness', 'a', 'b'],
alias: ['LAB', 'cielab'],
xyz: function(lab) {
var l = lab[0],
a = lab[1],
b = lab[2],
x, y, z, y2;
if (l <= 8) {
y = (l * 100) / 903.3;
y2 = (7.787 * (y / 100)) + (16 / 116);
} else {
y = 100 * Math.pow((l + 16) / 116, 3);
y2 = Math.pow(y / 100, 1/3);
}
x = x / 95.047 <= 0.008856 ? x = (95.047 * ((a / 500) + y2 - (16 / 116))) / 7.787 : 95.047 * Math.pow((a / 500) + y2, 3);
z = z / 108.883 <= 0.008859 ? z = (108.883 * (y2 - (b / 200) - (16 / 116))) / 7.787 : 108.883 * Math.pow(y2 - (b / 200), 3);
return [x, y, z];
}
};
//extend xyz
xyz.lab = function(xyz){
var x = xyz[0],
y = xyz[1],
z = xyz[2],
l, a, b;
x /= 95.047;
y /= 100;
z /= 108.883;
x = x > 0.008856 ? Math.pow(x, 1/3) : (7.787 * x) + (16 / 116);
y = y > 0.008856 ? Math.pow(y, 1/3) : (7.787 * y) + (16 / 116);
z = z > 0.008856 ? Math.pow(z, 1/3) : (7.787 * z) + (16 / 116);
l = (116 * y) - 16;
a = 500 * (x - y);
b = 200 * (y - z);
return [l, a, b];
};

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node_modules/color-space/labh.js generated vendored Normal file
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/**
* Hunter-lab space.
*
* @module color-space/labh
*/
'use strict'
var xyz = require('./xyz');
module.exports = {
name: 'labh',
//mins/maxes are taken from colormine
//FIXME: check whether mins/maxes correct
min: [0,-128,-128],
max: [100,128,128],
channel: ['lightness', 'a', 'b'],
alias: ['LABh', 'hunter-lab', 'hlab'],
//maths are taken from EasyRGB
xyz: function(lab) {
var l = lab[0], a = lab[1], b = lab[2];
var _y = l / 10;
var _x = a / 17.5 * l / 10;
var _z = b / 7 * l / 10;
var y = _y * _y;
var x = ( _x + y ) / 1.02;
var z = -( _z - y ) / 0.847;
return [x,y,z];
}
};
//extend xyz
xyz.labh = function(xyz){
var x = xyz[0], y = xyz[1], z = xyz[2];
var l = 10 * Math.sqrt( y );
var a = y === 0 ? 0 : 17.5 * ((( 1.02 * x ) - y ) / Math.sqrt( y ) );
var b = y === 0 ? 0 : 7 * ( ( y - ( 0.847 * z ) ) / Math.sqrt( y ) );
return [l, a, b];
};

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node_modules/color-space/lchab.js generated vendored Normal file
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/**
* Cylindrical LAB
*
* @module color-space/lchab
*/
'use strict'
var xyz = require('./xyz');
var lab = require('./lab');
//cylindrical lab
var lchab = module.exports = {
name: 'lchab',
min: [0,0,0],
max: [100,100,360],
channel: ['lightness', 'chroma', 'hue'],
alias: ['LCHab', 'cielch', 'LCH', 'HLC', 'LSH'],
xyz: function(arg) {
return lab.xyz(lchab.lab(arg));
},
lab: function(lch) {
var l = lch[0],
c = lch[1],
h = lch[2],
a, b, hr;
hr = h / 360 * 2 * Math.PI;
a = c * Math.cos(hr);
b = c * Math.sin(hr);
return [l, a, b];
}
};
//extend lab
lab.lchab = function(lab) {
var l = lab[0],
a = lab[1],
b = lab[2],
hr, h, c;
hr = Math.atan2(b, a);
h = hr * 360 / 2 / Math.PI;
if (h < 0) {
h += 360;
}
c = Math.sqrt(a * a + b * b);
return [l, c, h];
};
xyz.lchab = function(arg){
return lab.lchab(xyz.lab(arg));
};

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/**
* Cylindrical CIE LUV
*
* @module color-space/lchuv
*/
'use strict'
var luv = require('./luv');
var xyz = require('./xyz');
//cylindrical luv
var lchuv = module.exports = {
name: 'lchuv',
channel: ['lightness', 'chroma', 'hue'],
alias: ['LCHuv', 'cielchuv'],
min: [0,0,0],
max: [100,100,360],
luv: function(luv){
var l = luv[0],
c = luv[1],
h = luv[2],
u, v, hr;
hr = h / 360 * 2 * Math.PI;
u = c * Math.cos(hr);
v = c * Math.sin(hr);
return [l, u, v];
},
xyz: function(arg) {
return luv.xyz(lchuv.luv(arg));
}
};
luv.lchuv = function(luv){
var l = luv[0], u = luv[1], v = luv[2];
var c = Math.sqrt(u*u + v*v);
var hr = Math.atan2(v,u);
var h = hr * 360 / 2 / Math.PI;
if (h < 0) {
h += 360;
}
return [l,c,h]
};
xyz.lchuv = function(arg){
return luv.lchuv(xyz.luv(arg));
};

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/**
* A responsivity of cones color space.
* Used for CAT - chromatic adaptation transform.
*
* http://en.wikipedia.org/wiki/LMS_color_space
* http://www.mathworks.com/matlabcentral/fileexchange/28790-colorspace-transformations
*
* @todo xyz -> lms
* @todo tests
*
* @module color-space/lms
*/
'use strict'
var xyz = require('./xyz');
var lms = module.exports = {
name: 'lms',
min: [0,0,0],
max: [100,100,100],
channel: ['long', 'medium', 'short'],
//transform matrices
matrix: {
HPE: [
0.38971, 0.68898,-0.07868,
-0.22981, 1.18340, 0.04641,
0.00000, 0.00000, 1.00000],
VONKRIES: [
0.4002, 0.7076, -0.0808,
-0.2263, 1.1653, 0.0457,
0.00000,0.00000, 0.9182],
BFD: [
0.8951, 0.2664,-0.1614,
-0.7502, 1.7135, 0.0367,
0.0389,-0.0686, 1.0296],
CAT97: [
0.8562, 0.3372,-0.1934,
-0.8360, 1.8327, 0.0033,
0.0357,-0.00469,1.0112],
CAT00: [
0.7982, 0.3389,-0.1371,
-0.5918, 1.5512, 0.0406,
0.0008, 0.0239, 0.9753],
CAT02: [
0.7328, 0.4296,-0.1624,
-0.7036, 1.6975, 0.0061,
0.0030, 0.0136, 0.9834]
}
};
lms.xyz = function(arg, matrix){
var l = arg[0], m = arg[1], s = arg[2];
if (!matrix) {
matrix = [
1.096123820835514, -0.278869000218287, +0.182745179382773,
0.454369041975359, + 0.473533154307412, +0.072097803717229,
-0.009627608738429, -0.005698031216113, +1.015325639954543
];
}
return [
l * matrix[0] + m * matrix[1] + s * matrix[2],
l * matrix[3] + m * matrix[4] + s * matrix[5],
l * matrix[6] + m * matrix[7] + s * matrix[8]
];
};
xyz.lms = function(arg, matrix) {
var x = arg[0], y = arg[1], z = arg[2];
if (!matrix) {
matrix = lms.matrix.CAT02
}
return [
x * matrix[0] + y * matrix[1] + z * matrix[2],
x * matrix[3] + y * matrix[4] + z * matrix[5],
x * matrix[6] + y * matrix[7] + z * matrix[8]
];
};

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/**
* CIE LUV (C'est la vie)
*
* @module color-space/luv
*/
'use strict'
var xyz = require('./xyz');
module.exports = {
name: 'luv',
//NOTE: luv has no rigidly defined limits
//easyrgb fails to get proper coords
//boronine states no rigid limits
//colorMine refers this ones:
min: [0,-134,-140],
max: [100,224,122],
channel: ['lightness', 'u', 'v'],
alias: ['LUV', 'cieluv', 'cie1976'],
xyz: function(arg, i, o){
var _u, _v, l, u, v, x, y, z, xn, yn, zn, un, vn;
l = arg[0], u = arg[1], v = arg[2];
if (l === 0) return [0,0,0];
//get constants
//var e = 0.008856451679035631; //(6/29)^3
var k = 0.0011070564598794539; //(3/29)^3
//get illuminant/observer
i = i || 'D65';
o = o || 2;
xn = xyz.whitepoint[o][i][0];
yn = xyz.whitepoint[o][i][1];
zn = xyz.whitepoint[o][i][2];
un = (4 * xn) / (xn + (15 * yn) + (3 * zn));
vn = (9 * yn) / (xn + (15 * yn) + (3 * zn));
// un = 0.19783000664283;
// vn = 0.46831999493879;
_u = u / (13 * l) + un || 0;
_v = v / (13 * l) + vn || 0;
y = l > 8 ? yn * Math.pow( (l + 16) / 116 , 3) : yn * l * k;
//wikipedia method
x = y * 9 * _u / (4 * _v) || 0;
z = y * (12 - 3 * _u - 20 * _v) / (4 * _v) || 0;
//boronine method
//https://github.com/boronine/husl/blob/master/husl.coffee#L201
// x = 0 - (9 * y * _u) / ((_u - 4) * _v - _u * _v);
// z = (9 * y - (15 * _v * y) - (_v * x)) / (3 * _v);
return [x, y, z];
}
};
// http://www.brucelindbloom.com/index.html?Equations.html
// https://github.com/boronine/husl/blob/master/husl.coffee
//i - illuminant
//o - observer
xyz.luv = function(arg, i, o) {
var _u, _v, l, u, v, x, y, z, xn, yn, zn, un, vn;
//get constants
var e = 0.008856451679035631; //(6/29)^3
var k = 903.2962962962961; //(29/3)^3
//get illuminant/observer coords
i = i || 'D65';
o = o || 2;
xn = xyz.whitepoint[o][i][0];
yn = xyz.whitepoint[o][i][1];
zn = xyz.whitepoint[o][i][2];
un = (4 * xn) / (xn + (15 * yn) + (3 * zn));
vn = (9 * yn) / (xn + (15 * yn) + (3 * zn));
x = arg[0], y = arg[1], z = arg[2];
_u = (4 * x) / (x + (15 * y) + (3 * z)) || 0;
_v = (9 * y) / (x + (15 * y) + (3 * z)) || 0;
var yr = y/yn;
l = yr <= e ? k * yr : 116 * Math.pow(yr, 1/3) - 16;
u = 13 * l * (_u - un);
v = 13 * l * (_v - vn);
return [l, u, v];
};

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/**
* @module color-space/munsell
*/
'use strict'
var munsell = {
name: 'munsell',
alias: [],
min: [],
max: [],
//hue, value, chroma
channel: ['H', 'V', 'C']
}
/**
* http://www.pp.bme.hu/ar/article/view/2395/1500
*/
munsell.coloroid = function (cv) {
var c = arg[0], vm = arg[1];
var a,t,v;
//coloroid chroma / munsell chroma
t = kav * Math.pow(c, 2/3);
v = 10 * Math.sqrt(1.2219*vm - 0.23111*vm*vm + 0.23951*vm*vm*vm - 0.021009*vm*vm*vm*vm + 0.0008404*vm*vm*vm*vm*vm);
};
module.exports = munsell;

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/**
* OSA-UCS
*
* @module color-space/osa-ucs
*/
'use strict'
var xyz = require('./xyz');
var osaucs = {
name: 'osaucs',
alias: ['OSA-UCS'],
channel: ['L', 'j', 'g'],
min: [-10, -6, -10],
max: [8, 12, 6]
};
/**
* There’s no analytical solution to this
*/
osaucs.xyz = function (arg) {
var x, y, z;
throw 'Unimplemented';
//http://www.researchgate.net/publication/259253763_Comparison_of_the_performance_of_inverse_transformation_methods_from_OSA-UCS_to_CIEXYZ
return [x, y, z];
};
/**
* Transform to xyz osaucs
*
* @param {Array} arg Input xyz array
*
* @return {Array} Ljg array
*/
xyz.osaucs = function (arg) {
var X = arg[0], Y = arg[1], Z = arg[2];
var x = X / (X + Y + Z);
var y = Y / (X + Y + Z);
//FIXME: there might be a typo, wiki states 1.8103 as a constant value
var K = 4.4934*x*x + 4.3034*y*y - 4.276*x*y - 1.3744*x - 2.56439*y + 1.8103;
var Y0 = K*Y;
var L_ = 5.9*(Math.pow(Y0, 1/3) - 2/3 + 0.042*Math.pow(Math.max(Y0, 30) - 30, 1/3));
var L = (L_ - 14.3993) / Math.sqrt(2);
var C = L_ / (5.9 * (Math.pow(Y0, 1/3) - 2/3));
var R = 0.7790*X + 0.4194*Y - 0.1648*Z;
var G = -0.4493*X + 1.3265*Y + 0.0927*Z;
var B = -0.1149*X + 0.3394*Y + 0.7170*Z;
R = Math.pow(R, 1/3) || 0;
G = Math.pow(G, 1/3) || 0;
B = Math.pow(B, 1/3) || 0;
var a = -13.7*R + 17.7*G - 4*B;
var b = 1.7*R + 8*G - 9.7*B;
var g = C*a;
var j = C*b;
//polar form
// var p = Math.sqrt(j*j + g*g);
// var phi = Math.atan2(j, g);
return [L, j, g];
};
module.exports = osaucs;

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{
"name": "color-space",
"description": "Color space conversions and data",
"version": "1.16.0",
"author": "Deema Yvanow <dfcreative@gmail.com>",
"keywords": [
"color",
"colour",
"rgb",
"hsl",
"hsv",
"lab",
"lch",
"luv",
"lch",
"cie",
"hsluv",
"husl",
"color-convert",
"gamut",
"color-conversions",
"color-space",
"color-translation",
"color-data",
"coloroid",
"cubehelix",
"munsell",
"hcg",
"hsp"
],
"repository": {
"type": "git",
"url": "http://github.com/colorjs/color-space.git"
},
"files": [
"*.js",
"dist"
],
"license": "MIT",
"main": "./index.js",
"dependencies": {
"hsluv": "^0.0.3",
"mumath": "^3.3.4"
},
"devDependencies": {
"almost-equal": "^1.1.0",
"closurecompiler": "^1.x",
"gzip-size": "^3.0.0",
"mocha": "latest",
"queried": "^1.4.1"
},
"scripts": {
"test": "mocha",
"build": "browserify --standalone colorSpace ./index.js > dist/color-space.js",
"min": "ccjs dist/color-space.js --language_in=ECMASCRIPT5 > dist/color-space.min.js && cat dist/color-space.min.js | gzip-size | pretty-bytes",
"watch": "watchify -r ./index:../index -r hsluv -r assert -r mumath -r queried -d -o test/bundle.js"
}
}

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/**
* RGB space.
*
* @module color-space/rgb
*/
'use strict'
module.exports = {
name: 'rgb',
min: [0,0,0],
max: [255,255,255],
channel: ['red', 'green', 'blue'],
alias: ['RGB']
};

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/**
* https://en.wikipedia.org/wiki/TSL_color_space
* http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.86.6037&rep=rep1&type=pdf
*
* Tint, Saturation, Lightness
*
* @module color-space/tsl
*/
'use strict'
var rgb = require('./rgb');
var tsl = module.exports = {
name: 'tsl',
min: [0,0,0],
max: [1, 1, 1],
channel: ['tint','saturation','lightness']
};
/**
* TSL to RGB
*
* @param {Array} tsl RGB values
*
* @return {Array} TSL values
*/
tsl.rgb = function(tsl) {
var T = tsl[0],
S = tsl[1],
L = tsl[2];
//wikipedia solution
/*
// var x = - 1 / Math.tan(Math.PI * 2 * T);
var x = -Math.sin(2*Math.PI*T);
if ( x != 0 ) x = Math.cos(2*Math.PI*T)/x;
var g = T > .5 ? -S * Math.sqrt( 5 / (9 * (x*x + 1)) ) :
T < .5 ? S * Math.sqrt( 5 / (9 * (x*x + 1)) ) : 0;
var r = T === 0 ? 0.7453559 * S : (x * g + 1/3);
var R = k * r, G = k * g, B = k * (1 - r - g);
*/
var x = Math.tan(2 * Math.PI * (T - 1/4));
x *= x;
var r = Math.sqrt(5 * S*S / (9 * (1/x + 1))) + 1/3;
var g = Math.sqrt(5 * S*S / (9 * (x + 1))) + 1/3;
var k = L / (.185 * r + .473 * g + .114);
var B = k * (1 - r - g);
var G = k * g;
var R = k * r;
return [
R * 255, G * 255, B * 255
];
};
/**
* RGB to TSL
*
* @param {Array} tsl TSL values
*
* @return {Array} RGB values
*/
rgb.tsl = function(rgb) {
var r = rgb[0] / 255,
g = rgb[1] / 255,
b = rgb[2] / 255;
var r_ = (r / (r + g + b) || 0) - 1/3,
g_ = (g / (r + g + b) || 0) - 1/3;
var T = g_ > 0 ? .5 * Math.atan(r_/ g_) / Math.PI + .25 :
g_ < 0 ? .5 * Math.atan(r_/ g_) / Math.PI + .75 : 0;
var S = Math.sqrt(9/5 * (r_*r_ + g_*g_));
var L = (r * 0.299) + (g * 0.587) + (b * 0.114);
return [T, S, L];
};

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node_modules/color-space/ucs.js generated vendored Normal file
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/**
* https://en.wikipedia.org/wiki/CIE_1960_color_space
*
* Obsolete color space
*
* @module color-space/ucs
*/
'use strict'
var xyz = require('./xyz');
var ucs = module.exports = {
name: 'ucs',
min: [0,0,0],
max: [100, 100, 100],
channel: ['U','V','W'],
alias: ['UCS', 'cie1960']
};
/**
* UCS to XYZ
*
* @param {Array} ucs XYZ values
*
* @return {Array} UCS values
*/
ucs.xyz = function(ucs) {
var u = ucs[0],
v = ucs[1],
w = ucs[2];
return [
1.5 * u,
v,
1.5 * u - 3 * v + 2 * w
];
};
/**
* XYZ to UCS
*
* @param {Array} ucs UCS values
*
* @return {Array} XYZ values
*/
xyz.ucs = function(xyz) {
var x = xyz[0],
y = xyz[1],
z = xyz[2];
return [
x * 2/3,
y,
0.5 * (-x + 3*y + z)
];
};

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/**
* https://en.wikipedia.org/wiki/CIE_1964_color_space
*
* Very similar to LUV, but w and v are calculated a bit differently.
*
* @module color-space/uvw
*/
'use strict'
var ucs = require('./ucs');
var xyz = require('./xyz');
var uvw = module.exports = {
name: 'uvw',
min: [-134, -140, 0],
max: [224, 122, 100],
channel: ['U','V','W'],
alias: ['UVW', 'cieuvw', 'cie1964']
};
/**
* UVW to XYZ
*/
uvw.xyz = function (arg, i, o) {
var _u, _v, w, u, v, x, y, z, xn, yn, zn, un, vn;
u = arg[0], v = arg[1], w = arg[2];
if (w === 0) return [0,0,0];
//get illuminant/observer
i = i || 'D65';
o = o || 2;
xn = xyz.whitepoint[o][i][0];
yn = xyz.whitepoint[o][i][1];
zn = xyz.whitepoint[o][i][2];
un = (4 * xn) / (xn + (15 * yn) + (3 * zn));
vn = (6 * yn) / (xn + (15 * yn) + (3 * zn));
y = Math.pow((w + 17) / 25, 3);
_u = u / (13 * w) + un || 0;
_v = v / (13 * w) + vn || 0;
x = (6 / 4) * y * _u / _v;
z = y * (2 / _v - 0.5 * _u / _v - 5);
return [x, y, z];
};
/**
* XYZ to UVW
*
* @return {Array} An UVW array
*/
xyz.uvw = function (arr, i, o) {
var x = arr[0], y = arr[1], z = arr[2], xn, yn, zn, un, vn;
//find out normal source u v
i = i || 'D65';
o = o || 2;
xn = xyz.whitepoint[o][i][0];
yn = xyz.whitepoint[o][i][1];
zn = xyz.whitepoint[o][i][2];
un = (4 * xn) / (xn + (15 * yn) + (3 * zn));
vn = (6 * yn) / (xn + (15 * yn) + (3 * zn));
var _u = 4 * x / (x + 15 * y + 3 * z) || 0;
var _v = 6 * y / (x + 15 * y + 3 * z) || 0;
//calc values
var w = 25 * Math.pow(y, 1/3) - 17;
var u = 13 * w * (_u - un);
var v = 13 * w * (_v - vn);
return [u, v, w];
};
/**
* UVW to UCS
*
* @param {Array} uvw UCS values
*
* @return {Array} UVW values
*/
uvw.ucs = function(uvw) {
//find chromacity variables
};
/**
* UCS to UVW
*
* @param {Array} uvw UVW values
*
* @return {Array} UCS values
*/
ucs.uvw = function(ucs) {
// //find chromacity variables
// var u = U / (U + V + W);
// var v = V / (U + V + W);
// //find 1964 UVW
// w = 25 * Math.pow(y, 1/3) - 17;
// u = 13 * w * (u - un);
// v = 13 * w * (v - vn);
};

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/**
* https://en.wikipedia.org/wiki/XvYCC
*
* Sony xvYCC is extended YCbCr
*
* It uses same transformation as
* SD: ITU-R BT.601
* HD: ITU-R BT.709
*
* But have extended mins/maxes, which (may) result in negative rgb values
*
* https://web.archive.org/web/20130524104850/http://www.sony.net/SonyInfo/technology/technology/theme/xvycc_01.html
*
* //TODO: look for a spec (120$) - there are xvYCC ←→ XYZ conversion formulas
*
* @module color-space/xvycc
*/
'use strict'
var rgb = require('./rgb');
var ypbpr = require('./ypbpr');
var xvycc = module.exports = {
name: 'xvycc',
min: [0, 0, 0],
max: [255, 255, 255],
channel: ['Y','Cb','Cr'],
alias: ['xvYCC']
};
/**
* From analog to digital form.
* Simple scale to min/max ranges
*
* @return {Array} Resulting digitized form
*/
ypbpr.xvycc = function (ypbpr) {
var y = ypbpr[0], pb = ypbpr[1], pr = ypbpr[2];
return [
16 + 219 * y,
128 + 224 * pb,
128 + 224 * pr
];
}
/**
* From digital to analog form.
* Scale to min/max ranges
*/
xvycc.ypbpr = function (xvycc) {
var y = xvycc[0], cb = xvycc[1], cr = xvycc[2];
return [
(y - 16) / 219,
(cb - 128) / 224,
(cr - 128) / 224
];
}
/**
* xvYCC to RGB
* transform through analog form
*
* @param {Array} xvycc RGB values
*
* @return {Array} xvYCC values
*/
xvycc.rgb = function (arr, kb, kr) {
return ypbpr.rgb(xvycc.ypbpr(arr), kb, kr);
};
/**
* RGB to xvYCC
* transform through analog form
*
* @param {Array} xvycc xvYCC values
*
* @return {Array} RGB values
*/
rgb.xvycc = function(arr, kb, kr) {
return ypbpr.xvycc(rgb.ypbpr(arr, kb, kr));
};

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/**
* Additional xyY space, where xy are relative chromacity params
*
* @module color-space/xyy
*/
'use strict'
var xyz = require('./xyz');
var xyy = {
name: 'xyy',
min: [0,0,0],
max: [1,1,100],
channel: ['x','y','Y'],
alias: ['xyY', 'Yxy', 'yxy']
};
xyy.xyz = function(arg) {
var X, Y, Z, x, y;
x = arg[0]; y = arg[1]; Y = arg[2];
if (y === 0) {
return [0, 0, 0];
}
X = x * Y / y;
Z = (1 - x - y) * Y / y;
return [X, Y, Z];
};
xyz.xyy = function(arg) {
var sum, X, Y, Z;
X = arg[0]; Y = arg[1]; Z = arg[2];
sum = X + Y + Z;
if (sum === 0) {
return [0, 0, Y];
}
return [X / sum, Y / sum, Y];
};
module.exports = xyy;

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/**
* CIE XYZ
*
* @module color-space/xyz
*/
'use strict'
var rgb = require('./rgb');
var xyz = {
name: 'xyz',
min: [0,0,0],
channel: ['X','Y','Z'],
alias: ['XYZ', 'ciexyz', 'cie1931']
};
/**
* Whitepoint reference values with observer/illuminant
*
* http://en.wikipedia.org/wiki/Standard_illuminant
*/
xyz.whitepoint = {
//1931 2°
2: {
//incadescent
A:[109.85, 100, 35.585],
// B:[],
C: [98.074, 100, 118.232],
D50: [96.422, 100, 82.521],
D55: [95.682, 100, 92.149],
//daylight
D65: [95.045592705167, 100, 108.9057750759878],
D75: [94.972, 100, 122.638],
//flourescent
// F1: [],
F2: [99.187, 100, 67.395],
// F3: [],
// F4: [],
// F5: [],
// F6:[],
F7: [95.044, 100, 108.755],
// F8: [],
// F9: [],
// F10: [],
F11: [100.966, 100, 64.370],
// F12: [],
E: [100,100,100]
},
//1964 10°
10: {
//incadescent
A:[111.144, 100, 35.200],
C: [97.285, 100, 116.145],
D50: [96.720, 100, 81.427],
D55: [95.799, 100, 90.926],
//daylight
D65: [94.811, 100, 107.304],
D75: [94.416, 100, 120.641],
//flourescent
F2: [103.280, 100, 69.026],
F7: [95.792, 100, 107.687],
F11: [103.866, 100, 65.627],
E: [100,100,100]
}
};
/**
* Top values are the whitepoint’s top values, default are D65
*/
xyz.max = xyz.whitepoint[2].D65;
/**
* Transform xyz to rgb
*
* @param {Array} xyz Array of xyz values
*
* @return {Array} RGB values
*/
xyz.rgb = function (_xyz, white) {
//FIXME: make sure we have to divide like this. Probably we have to replace matrix as well then
white = white || xyz.whitepoint[2].E;
var x = _xyz[0] / white[0],
y = _xyz[1] / white[1],
z = _xyz[2] / white[2],
r, g, b;
// assume sRGB
// http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html
r = (x * 3.240969941904521) + (y * -1.537383177570093) + (z * -0.498610760293);
g = (x * -0.96924363628087) + (y * 1.87596750150772) + (z * 0.041555057407175);
b = (x * 0.055630079696993) + (y * -0.20397695888897) + (z * 1.056971514242878);
r = r > 0.0031308 ? ((1.055 * Math.pow(r, 1.0 / 2.4)) - 0.055)
: r = (r * 12.92);
g = g > 0.0031308 ? ((1.055 * Math.pow(g, 1.0 / 2.4)) - 0.055)
: g = (g * 12.92);
b = b > 0.0031308 ? ((1.055 * Math.pow(b, 1.0 / 2.4)) - 0.055)
: b = (b * 12.92);
r = Math.min(Math.max(0, r), 1);
g = Math.min(Math.max(0, g), 1);
b = Math.min(Math.max(0, b), 1);
return [r * 255, g * 255, b * 255];
}
/**
* RGB to XYZ
*
* @param {Array} rgb RGB channels
*
* @return {Array} XYZ channels
*/
rgb.xyz = function(rgb, white) {
var r = rgb[0] / 255,
g = rgb[1] / 255,
b = rgb[2] / 255;
// assume sRGB
r = r > 0.04045 ? Math.pow(((r + 0.055) / 1.055), 2.4) : (r / 12.92);
g = g > 0.04045 ? Math.pow(((g + 0.055) / 1.055), 2.4) : (g / 12.92);
b = b > 0.04045 ? Math.pow(((b + 0.055) / 1.055), 2.4) : (b / 12.92);
var x = (r * 0.41239079926595) + (g * 0.35758433938387) + (b * 0.18048078840183);
var y = (r * 0.21263900587151) + (g * 0.71516867876775) + (b * 0.072192315360733);
var z = (r * 0.019330818715591) + (g * 0.11919477979462) + (b * 0.95053215224966);
white = white || xyz.whitepoint[2].E;
return [x * white[0], y * white[1], z * white[2]];
};
module.exports = xyz;

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/**
* https://en.wikipedia.org/?title=YCbCr
*
* YCbCr is a digital form of YPbPr conversion
* Thence limits are [16...235], according to the ITU-R BT.709 or ITU-R BT.601
*
* @module color-space/ycbcr
*/
'use strict'
var rgb = require('./rgb');
var ypbpr = require('./ypbpr');
var ycbcr = module.exports = {
name: 'ycbcr',
min: [16, 16, 16],
max: [235, 240, 240],
channel: ['Y','Cb','Cr'],
alias: ['YCbCr', 'YCC']
};
/**
* From analog to digital form.
* Simple scale to min/max ranges
*
* @return {Array} Resulting digitized form
*/
ypbpr.ycbcr = function (ypbpr) {
var y = ypbpr[0], pb = ypbpr[1], pr = ypbpr[2];
return [
16 + 219 * y,
128 + 224 * pb,
128 + 224 * pr
];
}
/**
* From digital to analog form.
* Scale to min/max ranges
*/
ycbcr.ypbpr = function (ycbcr) {
var y = ycbcr[0], cb = ycbcr[1], cr = ycbcr[2];
return [
(y - 16) / 219,
(cb - 128) / 224,
(cr - 128) / 224
];
}
/**
* YCbCr to RGB
* transform through analog form
*
* @param {Array} ycbcr RGB values
*
* @return {Array} YCbCr values
*/
ycbcr.rgb = function (arr, kb, kr) {
return ypbpr.rgb(ycbcr.ypbpr(arr), kb, kr);
};
/**
* RGB to YCbCr
* transform through analog form
*
* @param {Array} ycbcr YCbCr values
*
* @return {Array} RGB values
*/
rgb.ycbcr = function(arr, kb, kr) {
return ypbpr.ycbcr(rgb.ypbpr(arr, kb, kr));
};

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node_modules/color-space/yccbccrc.js generated vendored Normal file
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/**
* YcCbcCrc is ITU-R BT.2020
*
* @module color-space/yccbccrc
*/
'use strict'
var rgb = require('./rgb');
var ypbpr = require('./ypbpr');
var yccbccrc = module.exports = {
name: 'yccbccrc',
min: [0, -0.5, -0.5],
max: [1, 0.5, 0.5],
channel: ['Yc','Cbc','Crc'],
alias: ['YcCbcCrc']
};
/**
* YcCbcCrc to RGB
*
* @param {Array} yccbccrc RGB values
*
* @return {Array} YcCbcCrc values
*/
yccbccrc.rgb = function(yccbccrc) {
return ypbpr.rgb(yccbccrc, 0.0593, 0.2627);
};
/**
* RGB to YcCbcCrc
*
* @param {Array} yccbccrc YcCbcCrc values
*
* @return {Array} RGB values
*/
rgb.yccbccrc = function(arr) {
return rgb.ypbpr(arr, 0.0593, 0.2627);
};

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node_modules/color-space/ycgco.js generated vendored Normal file
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/**
* https://en.wikipedia.org/?title=YCgCo
*
* @module color-space/ycgco
*/
'use strict'
var rgb = require('./rgb');
var ycgco = module.exports = {
name: 'ycgco',
min: [0, -0.5, -0.5],
max: [1, 0.5, 0.5],
channel: ['Y','Cg','Co'],
alias: ['YCgCo']
};
/**
* YCgCo to RGB
* transform through analog form
*
* @param {Array} ycgco RGB values
*
* @return {Array} YCgCo values
*/
ycgco.rgb = function (arr) {
var y = arr[0], cg = arr[1], co = arr[2];
var tmp = y - cg;
return [
(tmp + co)*255,
(y + cg)*255,
(tmp - co)*255
];
};
/**
* RGB to YCgCo
* transform through analog form
*
* @param {Array} ycgco YCgCo values
*
* @return {Array} RGB values
*/
rgb.ycgco = function(arr) {
var r = arr[0]/255, g = arr[1]/255, b = arr[2]/255;
return [
0.25*r + 0.5*g + 0.25*b,
-0.25*r + 0.5*g - 0.25*b,
0.5*r - 0.5*b
];
};

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node_modules/color-space/ydbdr.js generated vendored Normal file
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/**
* https://en.wikipedia.org/?title=YDbDr
*
* @module color-space/ydbdr
*/
'use strict'
var rgb = require('./rgb');
var yuv = require('./yuv');
var ydbdr = module.exports = {
name: 'ydbdr',
min: [0,-1.333,-1.333],
max: [1, 1.333, 1.333],
channel: ['Y','Db','Dr'],
alias: ['YDbDr']
};
/**
* YDbDr to RGB
*
* @param {Array} ydbdr RGB values
*
* @return {Array} YDbDr values
*/
ydbdr.rgb = function(ydbdr) {
var y = ydbdr[0], db = ydbdr[1], dr = ydbdr[2];
var r = y + 0.000092303716148*db - 0.525912630661865*dr;
var g = y - 0.129132898890509*db + 0.267899328207599*dr;
var b = y + 0.664679059978955*db - 0.000079202543533*dr;
return [r*255, g*255, b*255];
};
/**
* RGB to YDbDr
*
* @param {Array} ydbdr YDbDr values
*
* @return {Array} RGB values
*/
rgb.ydbdr = function(rgb) {
var r = rgb[0]/255, g = rgb[1]/255, b = rgb[2]/255;
return [
0.299*r + 0.587*g + 0.114*b,
-0.450*r - 0.883*g + 1.333*b,
-1.333*r + 1.116*g + 0.217*b
];
};
/**
* To YUV
*/
yuv.ydbdr = function (yuv) {
return [
yuv[0], 3.059*yuv[1], -2.169*yuv[2]
]
};
/**
* From YUV
*/
ydbdr.yuv = function (ydbdr) {
return [
ydbdr[0], ydbdr[1] / 3.059, -ydbdr[2] / 2.169
]
};

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/**
* YES color space
* http://www.atlantis-press.com/php/download_paper.php?id=198
*
* @module color-space/yes
*/
'use strict'
var rgb = require('./rgb');
var yes = module.exports = {
name: 'yes',
min: [0,0,0],
max: [1,1,1],
channel: ['luminance', 'e-factor', 's-factor']
};
yes.rgb = function(arg){
var y = arg[0], e = arg[1], s = arg[2];
var m = [
1, 1.431, .126,
1, -.569, .126,
1, .431, -1.874
];
var r = y * m[0] + e * m[1] + s * m[2],
g = y * m[3] + e * m[4] + s * m[5],
b = y * m[6] + e * m[7] + s * m[8];
return [r*255, g*255, b*255];
};
rgb.yes = function(arg) {
var r = arg[0] / 255, g = arg[1] / 255, b = arg[2] / 255;
var m = [
.253, .684, .063,
.500, -.50, .0,
.250, .250, -.5
];
return [
r * m[0] + g * m[1] + b * m[2],
r * m[3] + g * m[4] + b * m[5],
r * m[6] + g * m[7] + b * m[8]
];
};

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node_modules/color-space/yiq.js generated vendored Normal file
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/**
* YIQ https://en.wikipedia.org/?title=YIQ
*
* @module color-space/yiq
*/
'use strict'
var rgb = require('./rgb');
var yiq = module.exports = {
name: 'yiq',
min: [0,-0.5957,-0.5226],
max: [1, 0.5957, 0.5226],
channel: ['Y','I','Q'],
alias: ['YIQ']
};
yiq.rgb = function(yiq) {
var y = yiq[0],
i = yiq[1],
q = yiq[2],
r, g, b;
r = (y * 1) + (i * 0.956) + (q * 0.621);
g = (y * 1) + (i * -0.272) + (q * -0.647);
b = (y * 1) + (i * -1.108) + (q * 1.705);
r = Math.min(Math.max(0, r), 1);
g = Math.min(Math.max(0, g), 1);
b = Math.min(Math.max(0, b), 1);
return [r * 255, g * 255, b * 255];
};
//extend rgb
rgb.yiq = function(rgb) {
var r = rgb[0] / 255,
g = rgb[1] / 255,
b = rgb[2] / 255;
var y = (r * 0.299) + (g * 0.587) + (b * 0.114);
var i = 0, q = 0;
if (r !== g || g !== b) {
i = (r * 0.596) + (g * -0.275) + (b * -0.321);
q = (r * 0.212) + (g * -0.528) + (b * 0.311);
}
return [y, i, q];
};

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node_modules/color-space/ypbpr.js generated vendored Normal file
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/**
* https://en.wikipedia.org/?title=YPbPr
*
* YPbPr is analog form of YCbCr
* hence limits are [0..1]
*
* Default conversion is ITU-R BT.709
*
* @module color-space/ypbpr
*/
'use strict'
var rgb = require('./rgb');
var ypbpr = module.exports = {
name: 'ypbpr',
min: [0,-0.5,-0.5],
max: [1, 0.5, 0.5],
channel: ['Y','Pb','Pr'],
alias: ['YPbPr', 'Y/PB/PR', 'YPRPB', 'PRPBY', 'PBPRY', 'Y/Pb/Pr', 'YPrPb', 'PrPbY', 'PbPrY', 'Y/R-Y/B-Y', 'Y(R-Y)(B-Y)', 'R-Y', 'B-Y']
};
/**
* YPbPr to RGB
*
* @param {Array} ypbpr RGB values
*
* @return {Array} YPbPr values
*/
ypbpr.rgb = function(ypbpr, kb, kr) {
var y = ypbpr[0], pb = ypbpr[1], pr = ypbpr[2];
//default conversion is ITU-R BT.709
kb = kb || 0.0722;
kr = kr || 0.2126;
var r = y + 2 * pr * (1 - kr);
var b = y + 2 * pb * (1 - kb);
var g = (y - kr * r - kb * b) / (1 - kr - kb);
return [r*255,g*255,b*255];
};
/**
* RGB to YPbPr
*
* @param {Array} ypbpr YPbPr values
*
* @return {Array} RGB values
*/
rgb.ypbpr = function(rgb, kb, kr) {
var r = rgb[0]/255, g = rgb[1]/255, b = rgb[2]/255;
//ITU-R BT.709
kb = kb || 0.0722;
kr = kr || 0.2126;
var y = kr*r + (1 - kr - kb)*g + kb*b;
var pb = 0.5 * (b - y) / (1 - kb);
var pr = 0.5 * (r - y) / (1 - kr);
return [y, pb, pr];
};

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node_modules/color-space/yuv.js generated vendored Normal file
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/**
* YUV https://en.wikipedia.org/?title=YUV
*
* @module color-space/yuv
*/
'use strict'
var rgb = require('./rgb');
var yuv = module.exports = {
name: 'yuv',
min: [0,-0.5,-0.5],
max: [1, 0.5, 0.5],
channel: ['Y','U','V'],
alias: ['YUV', 'EBU'],
};
yuv.rgb = function(yuv) {
var y = yuv[0],
u = yuv[1],
v = yuv[2],
r, g, b;
r = (y * 1) + (u * 0) + (v * 1.13983);
g = (y * 1) + (u * -0.39465) + (v * -0.58060);
b = (y * 1) + (u * 2.02311) + (v * 0);
r = Math.min(Math.max(0, r), 1);
g = Math.min(Math.max(0, g), 1);
b = Math.min(Math.max(0, b), 1);
return [r * 255, g * 255, b * 255];
}
//extend rgb
rgb.yuv = function(rgb) {
var r = rgb[0] / 255,
g = rgb[1] / 255,
b = rgb[2] / 255;
var y = (r * 0.299) + (g * 0.587) + (b * 0.114);
var u = (r * -0.14713) + (g * -0.28886) + (b * 0.436);
var v = (r * 0.615) + (g * -0.51499) + (b * -0.10001);
return [y, u, v];
};