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# Cortex project
build/
# php files
index.php
# Numerous always-ignore extensions
*.bak
*.patch
*.diff
*.err
*.orig
*.log
*.rej
*.swo
*.swp
*.zip
*.vi
*~
*.sass-cache
# OS or Editor folders
.DS_Store
._*
.cache
.project
.settings
.tmproj
*.esproj
*.sublime-project
*.sublime-workspace
nbproject
thumbs.db
# Folders to ignore
.hg
.svn
.CVS
.idea
node_modules
old/
*-old/
*-notrack/
build/
combo/
reference/
jscoverage_lib/
temp/
coverage/

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language: node_js
node_js:
- "0.10"
- "0.8"

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Copyright (c) 2012-2015, Markus Ekholm
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the <organization> nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL MARKUS EKHOLM BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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# Color-diff
[![Build Status](https://travis-ci.org/markusn/color-diff.png)](https://travis-ci.org/markusn/color-diff)
[![Coverage Status](https://coveralls.io/repos/markusn/color-diff/badge.png?branch=master)](https://coveralls.io/r/markusn/color-diff?branch=master)
Implemets the CIEDE2000 color difference algorithm, conversion between RGB and LAB color and mapping all colors in palette X to the closest color in palette Y based on the CIEDE2000 difference.
## Installation
```bash
npm install color-diff --save
```
## Tests
Are located in the `test/` folder and are run by:
npm test
## Usage
```js
var diff = require('color-diff');
```
### diff.closest(color, palette)
Returns the closest color.
```js
var color = { R: 255, G: 1, B: 30 };
// red, green, blue
var palette = [ {R: 255, G: 0, B: 0 }, {R: 0, G: 255, B: 0 }, {R: 0, G: 0, B: 255} ];
diff.closest(color, palette); // {R: 255, G: 0, B: 0 }, red
```
The result above is obvious, but `diff.closest` could deal with more complicated cases.
### diff.furthest(color, palette)
Returns the most different color.
```js
var color = { R: 255, G: 255, B: 255 };
// black, white
var palette = [ {R: 0, G: 0, B: 0 }, {R: 255, G: 255, B: 255 } ];
diff.furthest(color, palette); // {R: 0, G: 0, B: 0 }, black
```
The result above is obvious, but `diff.furthest` could deal with more complicated cases.
#### color
`Object`
`color` is an object containing 3 properties: 'R', 'G', 'B', such as:
```js
{ R: 255, G: 1, B: 0 }
```
#### palette
`Array.<Object>`
Color palette array which contains many `color`-like objects.
## Author
Markus Ekholm
## License
3-clause BSD. For details see `COPYING`.

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/**
* @author Markus Ekholm
* @copyright 2012-2015 (c) Markus Ekholm <markus at botten dot org >
* @license Copyright (c) 2012-2015, Markus Ekholm
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL MARKUS EKHOLM BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* EXPORTS
*/
exports.rgb_to_lab = rgb_to_lab;
/**
* IMPORTS
*/
var pow = Math.pow;
var sqrt = Math.sqrt;
/**
* API FUNCTIONS
*/
/**
* Returns c converted to labcolor.
* @param {rgbcolor} c should have fields R,G,B
* @return {labcolor} c converted to labcolor
*/
function rgb_to_lab(c)
{
return xyz_to_lab(rgb_to_xyz(c))
}
/**
* Returns c converted to xyzcolor.
* @param {rgbcolor} c should have fields R,G,B
* @return {xyzcolor} c converted to xyzcolor
*/
function rgb_to_xyz(c)
{
// Based on http://www.easyrgb.com/index.php?X=MATH&H=02
var R = ( c.R / 255 );
var G = ( c.G / 255 );
var B = ( c.B / 255 );
if ( R > 0.04045 ) R = pow(( ( R + 0.055 ) / 1.055 ),2.4);
else R = R / 12.92;
if ( G > 0.04045 ) G = pow(( ( G + 0.055 ) / 1.055 ),2.4);
else G = G / 12.92;
if ( B > 0.04045 ) B = pow(( ( B + 0.055 ) / 1.055 ), 2.4);
else B = B / 12.92;
R *= 100;
G *= 100;
B *= 100;
// Observer. = 2°, Illuminant = D65
var X = R * 0.4124 + G * 0.3576 + B * 0.1805;
var Y = R * 0.2126 + G * 0.7152 + B * 0.0722;
var Z = R * 0.0193 + G * 0.1192 + B * 0.9505;
return {'X' : X, 'Y' : Y, 'Z' : Z};
}
/**
* Returns c converted to labcolor.
* @param {xyzcolor} c should have fields X,Y,Z
* @return {labcolor} c converted to labcolor
*/
function xyz_to_lab(c)
{
// Based on http://www.easyrgb.com/index.php?X=MATH&H=07
var ref_Y = 100.000;
var ref_Z = 108.883;
var ref_X = 95.047; // Observer= 2°, Illuminant= D65
var Y = c.Y / ref_Y;
var Z = c.Z / ref_Z;
var X = c.X / ref_X;
if ( X > 0.008856 ) X = pow(X, 1/3);
else X = ( 7.787 * X ) + ( 16 / 116 );
if ( Y > 0.008856 ) Y = pow(Y, 1/3);
else Y = ( 7.787 * Y ) + ( 16 / 116 );
if ( Z > 0.008856 ) Z = pow(Z, 1/3);
else Z = ( 7.787 * Z ) + ( 16 / 116 );
var L = ( 116 * Y ) - 16;
var a = 500 * ( X - Y );
var b = 200 * ( Y - Z );
return {'L' : L , 'a' : a, 'b' : b};
}
// Local Variables:
// allout-layout: t
// js-indent-level: 2
// End:

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/**
* @author Markus Ekholm
* @copyright 2012-2015 (c) Markus Ekholm <markus at botten dot org >
* @license Copyright (c) 2012-2015, Markus Ekholm
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL MARKUS EKHOLM BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* EXPORTS
*/
exports.ciede2000 = ciede2000;
/**
* IMPORTS
*/
var sqrt = Math.sqrt;
var pow = Math.pow;
var cos = Math.cos;
var atan2 = Math.atan2;
var sin = Math.sin;
var abs = Math.abs;
var exp = Math.exp;
var PI = Math.PI;
/**
* API FUNCTIONS
*/
/**
* Returns diff between c1 and c2 using the CIEDE2000 algorithm
* @param {labcolor} c1 Should have fields L,a,b
* @param {labcolor} c2 Should have fields L,a,b
* @return {float} Difference between c1 and c2
*/
function ciede2000(c1,c2)
{
/**
* Implemented as in "The CIEDE2000 Color-Difference Formula:
* Implementation Notes, Supplementary Test Data, and Mathematical Observations"
* by Gaurav Sharma, Wencheng Wu and Edul N. Dalal.
*/
// Get L,a,b values for color 1
var L1 = c1.L;
var a1 = c1.a;
var b1 = c1.b;
// Get L,a,b values for color 2
var L2 = c2.L;
var a2 = c2.a;
var b2 = c2.b;
// Weight factors
var kL = 1;
var kC = 1;
var kH = 1;
/**
* Step 1: Calculate C1p, C2p, h1p, h2p
*/
var C1 = sqrt(pow(a1, 2) + pow(b1, 2)) //(2)
var C2 = sqrt(pow(a2, 2) + pow(b2, 2)) //(2)
var a_C1_C2 = (C1+C2)/2.0; //(3)
var G = 0.5 * (1 - sqrt(pow(a_C1_C2 , 7.0) /
(pow(a_C1_C2, 7.0) + pow(25.0, 7.0)))); //(4)
var a1p = (1.0 + G) * a1; //(5)
var a2p = (1.0 + G) * a2; //(5)
var C1p = sqrt(pow(a1p, 2) + pow(b1, 2)); //(6)
var C2p = sqrt(pow(a2p, 2) + pow(b2, 2)); //(6)
var hp_f = function(x,y) //(7)
{
if(x== 0 && y == 0) return 0;
else{
var tmphp = degrees(atan2(x,y));
if(tmphp >= 0) return tmphp
else return tmphp + 360;
}
}
var h1p = hp_f(b1, a1p); //(7)
var h2p = hp_f(b2, a2p); //(7)
/**
* Step 2: Calculate dLp, dCp, dHp
*/
var dLp = L2 - L1; //(8)
var dCp = C2p - C1p; //(9)
var dhp_f = function(C1, C2, h1p, h2p) //(10)
{
if(C1*C2 == 0) return 0;
else if(abs(h2p-h1p) <= 180) return h2p-h1p;
else if((h2p-h1p) > 180) return (h2p-h1p)-360;
else if((h2p-h1p) < -180) return (h2p-h1p)+360;
else throw(new Error());
}
var dhp = dhp_f(C1,C2, h1p, h2p); //(10)
var dHp = 2*sqrt(C1p*C2p)*sin(radians(dhp)/2.0); //(11)
/**
* Step 3: Calculate CIEDE2000 Color-Difference
*/
var a_L = (L1 + L2) / 2.0; //(12)
var a_Cp = (C1p + C2p) / 2.0; //(13)
var a_hp_f = function(C1, C2, h1p, h2p) { //(14)
if(C1*C2 == 0) return h1p+h2p
else if(abs(h1p-h2p)<= 180) return (h1p+h2p)/2.0;
else if((abs(h1p-h2p) > 180) && ((h1p+h2p) < 360)) return (h1p+h2p+360)/2.0;
else if((abs(h1p-h2p) > 180) && ((h1p+h2p) >= 360)) return (h1p+h2p-360)/2.0;
else throw(new Error());
}
var a_hp = a_hp_f(C1,C2,h1p,h2p); //(14)
var T = 1-0.17*cos(radians(a_hp-30))+0.24*cos(radians(2*a_hp))+
0.32*cos(radians(3*a_hp+6))-0.20*cos(radians(4*a_hp-63)); //(15)
var d_ro = 30 * exp(-(pow((a_hp-275)/25,2))); //(16)
var RC = sqrt((pow(a_Cp, 7.0)) / (pow(a_Cp, 7.0) + pow(25.0, 7.0)));//(17)
var SL = 1 + ((0.015 * pow(a_L - 50, 2)) /
sqrt(20 + pow(a_L - 50, 2.0)));//(18)
var SC = 1 + 0.045 * a_Cp;//(19)
var SH = 1 + 0.015 * a_Cp * T;//(20)
var RT = -2 * RC * sin(radians(2 * d_ro));//(21)
var dE = sqrt(pow(dLp /(SL * kL), 2) + pow(dCp /(SC * kC), 2) +
pow(dHp /(SH * kH), 2) + RT * (dCp /(SC * kC)) *
(dHp / (SH * kH))); //(22)
return dE;
}
/**
* INTERNAL FUNCTIONS
*/
function degrees(n) { return n*(180/PI); }
function radians(n) { return n*(PI/180); }
// Local Variables:
// allout-layout: t
// js-indent-level: 2
// End:

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'use strict';
var diff = require('./diff');
var convert = require('./convert');
var palette = require('./palette');
var color = module.exports = {};
color.diff = diff.ciede2000;
color.rgb_to_lab = convert.rgb_to_lab;
color.map_palette = palette.map_palette;
color.palette_map_key = palette.palette_map_key;
color.closest = function(target, relative) {
var key = color.palette_map_key(target);
var result = color.map_palette([target], relative, 'closest');
return result[key];
};
color.furthest = function(target, relative) {
var key = color.palette_map_key(target);
var result = color.map_palette([target], relative, 'furthest');
return result[key];
};

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/**
* @author Markus Ekholm
* @copyright 2012-2015 (c) Markus Ekholm <markus at botten dot org >
* @license Copyright (c) 2012-2015, Markus Ekholm
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL MARKUS EKHOLM BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* EXPORTS
*/
exports.map_palette = map_palette;
exports.palette_map_key = palette_map_key;
/**
* IMPORTS
*/
var color_diff = require('./diff');
var color_convert = require('./convert');
/**
* API FUNCTIONS
*/
/**
* Returns the hash key used for a {rgbcolor} in a {palettemap}
* @param {rgbcolor} c should have fields R,G,B
* @return {string}
*/
function palette_map_key(c)
{
return "R" + c.R + "B" + c.B + "G" + c.G;
}
/**
* Returns a mapping from each color in a to the closest color in b
* @param [{rgbcolor}] a each element should have fields R,G,B
* @param [{rgbcolor}] b each element should have fields R,G,B
* @param 'type' should be the string 'closest' or 'furthest'
* @return {palettemap}
*/
function map_palette(a, b, type)
{
var c = {};
type = type || 'closest';
for (var idx1 = 0; idx1 < a.length; idx1 += 1){
var color1 = a[idx1];
var best_color = undefined;
var best_color_diff = undefined;
for (var idx2 = 0; idx2 < b.length; idx2 += 1)
{
var color2 = b[idx2];
var current_color_diff = diff(color1,color2);
if((best_color == undefined) || ((type === 'closest') && (current_color_diff < best_color_diff)))
{
best_color = color2;
best_color_diff = current_color_diff;
continue;
}
if((type === 'furthest') && (current_color_diff > best_color_diff))
{
best_color = color2;
best_color_diff = current_color_diff;
continue;
}
}
c[palette_map_key(color1)] = best_color;
}
return c;
}
/**
* INTERNAL FUNCTIONS
*/
function diff(c1,c2)
{
c1 = color_convert.rgb_to_lab(c1);
c2 = color_convert.rgb_to_lab(c2);
return color_diff.ciede2000(c1,c2);
}
// Local Variables:
// allout-layout: t
// js-indent-level: 2
// End:

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{
"_args": [
[
"color-diff@^0.1.3",
"/Users/pmarsceill/_projects/just-the-docs/node_modules/colorguard"
]
],
"_from": "color-diff@>=0.1.3 <0.2.0",
"_id": "color-diff@0.1.7",
"_inCache": true,
"_installable": true,
"_location": "/color-diff",
"_npmUser": {
"email": "markus@botten.org",
"name": "markusn"
},
"_npmVersion": "1.4.28",
"_phantomChildren": {},
"_requested": {
"name": "color-diff",
"raw": "color-diff@^0.1.3",
"rawSpec": "^0.1.3",
"scope": null,
"spec": ">=0.1.3 <0.2.0",
"type": "range"
},
"_requiredBy": [
"/colorguard"
],
"_resolved": "https://registry.npmjs.org/color-diff/-/color-diff-0.1.7.tgz",
"_shasum": "6db78cd9482a8e459d40821eaf4b503283dcb8e2",
"_shrinkwrap": null,
"_spec": "color-diff@^0.1.3",
"_where": "/Users/pmarsceill/_projects/just-the-docs/node_modules/colorguard",
"author": {
"name": "markusn kael"
},
"bugs": {
"url": "https://github.com/markusn/color-diff/issues"
},
"dependencies": {},
"description": "Implemets the CIEDE2000 color difference algorithm, conversion between RGB and LAB color and mapping all colors in palette X to the closest or most different color in palette Y based on the CIEDE2000 difference.",
"devDependencies": {
"assert": "~0.4.9",
"coveralls": "~2.1.0",
"istanbul": "~0.1.40",
"mocha": "~1.12.0"
},
"directories": {},
"dist": {
"shasum": "6db78cd9482a8e459d40821eaf4b503283dcb8e2",
"tarball": "https://registry.npmjs.org/color-diff/-/color-diff-0.1.7.tgz"
},
"gitHead": "61269601ac72e65afd111565bfa68a2d13092de0",
"homepage": "https://github.com/markusn/color-diff",
"keywords": [
"CIEDE2000",
"closest",
"color",
"color-diff",
"conversion",
"convert",
"diff",
"pallette"
],
"license": "BSD",
"main": "lib/index.js",
"maintainers": [
{
"name": "kael",
"email": "i@kael.me"
},
{
"name": "markusn",
"email": "markus@botten.org"
}
],
"name": "color-diff",
"optionalDependencies": {},
"readme": "ERROR: No README data found!",
"repository": {
"type": "git",
"url": "git://github.com/markusn/color-diff.git"
},
"scripts": {
"test": "istanbul cover _mocha && ((cat coverage/lcov.info | coveralls) || exit 0)"
},
"version": "0.1.7"
}

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/**
* @author Markus Ekholm
* @copyright 2012-2015 (c) Markus Ekholm <markus at botten dot org >
* @license Copyright (c) 2012-2015, Markus Ekholm
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL MARKUS EKHOLM BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* IMPORTS
*/
var assert = require('assert');
var color_convert = require('../lib/convert');
/**
* TESTS
*/
describe('convert', function(){
describe('#rgb_to_lab()', function(){
it('should convert to expected lab color #1', function(){
assert.deepEqual({'L' : 40.473, 'a' : -6.106, 'b' : -21.417},
round_all(color_convert.rgb_to_lab({'R' : 55,
'G' : 100,
'B' : 130})));
});
it('should convert to expected lab color #2', function(){
assert.deepEqual({'L' : 0, 'a' : 0, 'b' : 0},
round_all(color_convert.rgb_to_lab({'R' : 0,
'G' : 0,
'B' : 0})));
});
it('should convert to expected lab color #3', function(){
assert.deepEqual({'L' : 100, 'a' : 0.005, 'b' : -0.010},
round_all(color_convert.rgb_to_lab({'R' : 255,
'G' : 255,
'B' : 255})));
});
})
});
/**
* INTERNAL FUNCTIONS
*/
function round_all(c){ return {'L' : round(c.L),
'a' : round(c.a),
'b' : round(c.b)};
}
function round(n){ return Math.round(n*1000)/1000; }
// Local Variables:
// allout-layout: t
// js-indent-level: 2
// End:

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/**
* @author Markus Ekholm
* @copyright 2012-2015 (c) Markus Ekholm <markus at botten dot org >
* @license Copyright (c) 2012-2015, Markus Ekholm
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL MARKUS EKHOLM BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* IMPORTS
*/
var assert = require('assert');
var color_diff = require('../lib/diff');
/**
* TESTS
*/
/**
* CIEDE2000 tests the diff.cie2000.
* Cases taken from the paper "The CIEDE2000 Color-Difference Formula:
* Implementation Notes, Supplementary Test Data, and Mathematical Observations"
* by Gaurav Sharma, Wencheng Wu and Edul N. Dalal.
*/
describe('diff', function(){
describe('#ciede2000()', function(){
it("should use the true chroma difference (#1)", function(){
assert_ciede2000_diff(2.0425,
{"L" : 50.0000,
"a" : 2.6772,
"b" : -79.7751
},
{"L" : 50.0000,
"a" : 0.0000,
"b" : -82.7485
});
});
it("should use the true chroma difference (#2)", function(){
assert_ciede2000_diff(2.8615,
{"L" : 50.0000,
"a" : 3.1571,
"b" : -77.2803
},
{"L" : 50.0000,
"a" : 0.0000,
"b" : -82.7485
});
});
it("should use the true chroma difference (#3)", function(){
assert_ciede2000_diff(3.4412,
{"L" : 50.0000,
"a" : 2.8361,
"b" : -74.0200
},
{"L" : 50.0000,
"a" : 0.0000,
"b" : -82.7485
});
});
it("should use the true hue difference (#4)", function(){
assert_ciede2000_diff(1.0000,
{"L" : 50.0000,
"a" : -1.3802,
"b" : -84.2814
},
{"L" : 50.0000,
"a" : 0.0000,
"b" : -82.7485
});
});
it("should use the true hue difference (#5)", function(){
assert_ciede2000_diff(1.0000,
{"L" : 50.0000,
"a" : -1.1848,
"b" : -84.8006
},
{"L" : 50.0000,
"a" : 0.0000,
"b" : -82.7485
});
});
it("should use the true hue difference (#6)", function(){
assert_ciede2000_diff(1.0000,
{"L" : 50.0000,
"a" : -0.9009,
"b" : -85.5211
},
{"L" : 50.0000,
"a" : 0.0000,
"b" : -82.7485
});
});
it("should use the correct arctangent computation (#7)", function(){
assert_ciede2000_diff(2.3669,
{"L" : 50.0000,
"a" : 0.0000,
"b" : 0.0000
},
{"L" : 50.0000,
"a" : -1.0000,
"b" : 2.0000
});
});
it("should use the correct arctangent computation (#8)", function(){
assert_ciede2000_diff(2.3669,
{"L" : 50.0000,
"a" : -1.0000,
"b" : 2.0000
},
{"L" : 50.0000,
"a" : 0.0000,
"b" : 0.0000
});
});
it("should use the correct arctangent computation (#9)", function(){
assert_ciede2000_diff(7.1792,
{"L" : 50.0000,
"a" : 2.4900,
"b" : -0.0010
},
{"L" : 50.0000,
"a" : -2.4900,
"b" : 0.0009
});
});
it("should use the correct arctangent computation (#10)", function(){
assert_ciede2000_diff(7.1792,
{"L" : 50.0000,
"a" : 2.4900,
"b" : -0.0010
},
{"L" : 50.0000,
"a" : -2.4900,
"b" : 0.0010
});
});
it("should use the correct arctangent computation (#11)", function(){
assert_ciede2000_diff(7.2195,
{"L" : 50.0000,
"a" : 2.4900,
"b" : -0.0010
},
{"L" : 50.0000,
"a" : -2.4900,
"b" : 0.0011
});
});
it("should use the correct arctangent computation (#12)", function(){
assert_ciede2000_diff(7.2195,
{"L" : 50.0000,
"a" : 2.4900,
"b" : -0.0010
},
{"L" : 50.0000,
"a" : -2.4900,
"b" : 0.0012
});
});
it("should use the correct arctangent computation (#13)", function(){
assert_ciede2000_diff(4.8045,
{"L" : 50.0000,
"a" : -0.0010,
"b" : 2.4900
},
{"L" : 50.0000,
"a" : 0.0009,
"b" : -2.4900
});
});
it("should use the correct arctangent computation (#14)", function(){
assert_ciede2000_diff(4.8045,
{"L" : 50.0000,
"a" : -0.0010,
"b" : 2.4900
},
{"L" : 50.0000,
"a" : 0.0010,
"b" : -2.4900
});
});
it("should use the correct arctangent computation (#15)", function(){
assert_ciede2000_diff(4.7461,
{"L" : 50.0000,
"a" : -0.0010,
"b" : 2.4900
},
{"L" : 50.0000,
"a" : 0.0011,
"b" : -2.4900
});
});
it("should use the correct arctangent computation (#16)", function(){
assert_ciede2000_diff(4.3065,
{"L" : 50.0000,
"a" : 2.5000,
"b" : 0.0000
},
{"L" : 50.0000,
"a" : 0.0000,
"b" : -2.5000
});
});
it("should work for large color differences (#17)", function(){
assert_ciede2000_diff(27.1492,
{"L" : 50.0000,
"a" : 2.5000,
"b" : 0.0000
},
{"L" : 73.0000,
"a" : 25.0000,
"b" : -18.0000
});
});
it("should work for large color differences (#18)", function(){
assert_ciede2000_diff(22.8977,
{"L" : 50.0000,
"a" : 2.5000,
"b" : 0.0000
},
{"L" : 61.0000,
"a" : -5.0000,
"b" : 29.0000
});
});
it("should work for large color differences (#19)", function(){
assert_ciede2000_diff(31.9030,
{"L" : 50.0000,
"a" : 2.5000,
"b" : 0.0000
},
{"L" : 56.0000,
"a" : -27.0000,
"b" : -3.0000
});
});
it("should work for large color differences (#20)", function(){
assert_ciede2000_diff(19.4535,
{"L" : 50.0000,
"a" : 2.5000,
"b" : 0.0000
},
{"L" : 58.0000,
"a" : 24.0000,
"b" : 15.0000
});
});
it("should produce numbers found in the CIE technical report (#21)", function(){
assert_ciede2000_diff(1.0000,
{"L" : 50.0000,
"a" : 2.5000,
"b" : 0.0000
},
{"L" : 50.0000,
"a" : 3.1736,
"b" : 0.5854
});
});
it("should produce numbers found in the CIE technical report (#22)", function(){
assert_ciede2000_diff(1.0000,
{"L" : 50.0000,
"a" : 2.5000,
"b" : 0.0000
},
{"L" : 50.0000,
"a" : 3.2972,
"b" : 0.0000
});
});
it("should produce numbers found in the CIE technical report (#23)", function(){
assert_ciede2000_diff(1.0000,
{"L" : 50.0000,
"a" : 2.5000,
"b" : 0.0000
},
{"L" : 50.0000,
"a" : 1.8634,
"b" : 0.5757
});
});
it("should produce numbers found in the CIE technical report (#24)", function(){
assert_ciede2000_diff(1.0000,
{"L" : 50.0000,
"a" : 2.5000,
"b" : 0.0000
},
{"L" : 50.0000,
"a" : 3.2592,
"b" : 0.3350
});
});
it("should produce numbers found in the CIE technical report (#25)", function(){
assert_ciede2000_diff(1.2644,
{"L" : 60.2574,
"a" : -34.0099,
"b" : 36.2677
},
{"L" : 60.4626,
"a" : -34.1751,
"b" : 39.4387
});
});
it("should produce numbers found in the CIE technical report (#26)", function(){
assert_ciede2000_diff(1.2630,
{"L" : 63.0109,
"a" : -31.0961,
"b" : -5.8663
},
{"L" : 62.8187,
"a" : -29.7946,
"b" : -4.0864
});
});
it("should produce numbers found in the CIE technical report (#27)", function(){
assert_ciede2000_diff(1.8731,
{"L" : 61.2901,
"a" : 3.7196,
"b" : -5.3901
},
{"L" : 61.4292,
"a" : 2.2480,
"b" : -4.9620
});
});
it("should produce numbers found in the CIE technical report (#28)", function(){
assert_ciede2000_diff(1.8645,
{"L" : 35.0831,
"a" : -44.1164,
"b" : 3.7933
},
{"L" : 35.0232,
"a" : -40.0716,
"b" : 1.5901
});
});
it("should produce numbers found in the CIE technical report (#29)", function(){
assert_ciede2000_diff(2.0373,
{"L" : 22.7233,
"a" : 20.0904,
"b" : -46.6940
},
{"L" : 23.0331,
"a" : 14.9730,
"b" : -42.5619
});
});
it("should produce numbers found in the CIE technical report (#30)", function(){
assert_ciede2000_diff(1.4146,
{"L" : 36.4612,
"a" : 47.8580,
"b" : 18.3852
},
{"L" : 36.2715,
"a" : 50.5065,
"b" : 21.2231
});
});
it("should produce numbers found in the CIE technical report (#31)", function(){
assert_ciede2000_diff(1.4441,
{"L" : 90.8027,
"a" : -2.0831,
"b" : 1.4410
},
{"L" : 91.1528,
"a" : -1.6435,
"b" : 0.0447
});
});
it("should produce numbers found in the CIE technical report (#32)", function(){
assert_ciede2000_diff(1.5381,
{"L" : 90.9257,
"a" : -0.5406,
"b" : -0.9208
},
{"L" : 88.6381,
"a" : -0.8985,
"b" : -0.7239
});
});
it("should produce numbers found in the CIE technical report (#33)", function(){
assert_ciede2000_diff(0.6377,
{"L" : 6.7747,
"a" : -0.2908,
"b" : -2.4247
},
{"L" : 5.8714,
"a" : -0.0985,
"b" : -2.2286
});
});
it("should produce numbers found in the CIE technical report (#34)", function(){
assert_ciede2000_diff(0.9082,
{"L" : 2.0776,
"a" : 0.0795,
"b" : -1.1350
},
{"L" : 0.9033,
"a" : -0.0636,
"b" : -0.5514
});
});
it("should throw error", function(){
assert.throws(
function(){ color_diff.ciede2000({"L" : NaN,
"a" : NaN,
"b" : NaN},
{"L" : 0,
"a" : 0,
"b" : 0
})
},
Error)
});
})
});
/**
* INTERNAL FUNCTIONS
*/
function assert_ciede2000_diff(expected, c1, c2){
assert.equal(expected, round(color_diff.ciede2000(c1, c2)));
assert.equal(expected, round(color_diff.ciede2000(c2, c1)));
}
function round(n){ return Math.round(n*10000)/10000; }
// Local Variables:
// allout-layout: t
// js-indent-level: 2
// End:

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/**
* @author Markus Ekholm
* @copyright 2012-2015 (c) Markus Ekholm <markus at botten dot org >
* @license Copyright (c) 2012, Markus Ekholm
* All rights reserved.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the <organization> nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL MARKUS EKHOLM BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* IMPORTS
*/
var assert = require('assert');
var color_palette = require('../lib/palette');
/**
* CONSTANTS
*/
var white = {'R':255 , 'G':255 ,'B':255};
var black = {'R':0 , 'G':0 ,'B':0};
var navy = {'R':0 , 'G':0 ,'B':128};
var blue = {'R':0 , 'G':0 ,'B':255};
var yellow = {'R':255 , 'G':255 ,'B':0};
var gold = {'R':255 , 'G':215 ,'B':0};
var colors1 = [white, black, navy, blue, yellow, gold]
var colors2 = [white, black, blue, gold]
var colors3 = [white, black, yellow, blue]
/**
* TESTS
*/
describe('palette', function(){
describe('#map_palette()', function (){
it('should map all colors to themselves when possible',
function(){
var expected1 = {};
expected1[color_palette.palette_map_key(white)] = white;
expected1[color_palette.palette_map_key(black)] = black;
expected1[color_palette.palette_map_key(navy)] = navy;
expected1[color_palette.palette_map_key(blue)] = blue;
expected1[color_palette.palette_map_key(yellow)] = yellow;
expected1[color_palette.palette_map_key(gold)] = gold;
assert.deepEqual(expected1, color_palette.map_palette(colors1, colors1));
});
it('should map navy->blue and yellow->gold when navy and yellow are missing',
function(){
var expected2 = {};
expected2[color_palette.palette_map_key(white)] = white;
expected2[color_palette.palette_map_key(black)] = black;
expected2[color_palette.palette_map_key(navy)] = blue;
expected2[color_palette.palette_map_key(blue)] = blue;
expected2[color_palette.palette_map_key(yellow)] = gold;
expected2[color_palette.palette_map_key(gold)] = gold;
assert.deepEqual(expected2, color_palette.map_palette(colors1, colors2));
});
it('should map white->black & black,navy,blue->yellow & yellow,gold->blue',
function(){
var expected3 = {};
expected3[color_palette.palette_map_key(white)] = black;
expected3[color_palette.palette_map_key(black)] = yellow;
expected3[color_palette.palette_map_key(navy)] = yellow;
expected3[color_palette.palette_map_key(blue)] = yellow;
expected3[color_palette.palette_map_key(yellow)] = blue;
expected3[color_palette.palette_map_key(gold)] = blue;
assert.deepEqual(expected3, color_palette.map_palette(colors1, colors3, 'furthest'));
});
})
});
// Local Variables:
// allout-layout: t
// js-indent-level: 2
// End: