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Patrick Marsceill
2017-03-09 13:16:08 -05:00
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113
node_modules/color-diff/lib/convert.js generated vendored Normal file
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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: