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Convert RGB color to CIE LAB color
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function rgbToXyz(r, g, b) { | |
r /= 255 | |
g /= 255 | |
b /= 255 | |
if (r > 0.04045) r = Math.pow(((r + 0.055) / 1.055), 2.4) | |
else r = r / 12.92 | |
if (g > 0.04045) g = Math.pow(((g + 0.055) / 1.055), 2.4) | |
else g = g / 12.92 | |
if (b > 0.04045) b = Math.pow(((b + 0.055) / 1.055), 2.4) | |
else b = b / 12.92 | |
r = r * 100 | |
g = g * 100 | |
b = b * 100 | |
//Observer. = 2°, Illuminant = D65 | |
return { | |
x: r * 0.4124 + g * 0.3576 + b * 0.1805, | |
y: r * 0.2126 + g * 0.7152 + b * 0.0722, | |
z: r * 0.0193 + g * 0.1192 + b * 0.9505 | |
} | |
} | |
function xyzToLab(x, y, z) { | |
var refX = 95.047 | |
var refY = 100.000 | |
var refZ = 108.883 | |
x /= refX | |
y /= refY | |
z /= refZ | |
if (x > 0.008856) x = Math.pow(x, 1/3) | |
else x = 7.787 * x + 16 / 116 | |
if (y > 0.008856) y = Math.pow(y, 1/3) | |
else y = 7.787 * y + 16 / 116 | |
if (z > 0.008856) z = Math.pow(z, 1/3) | |
else z = 7.787 * z + 16 / 116 | |
return { | |
l: (116 * y) - 16, | |
a: 500 * (x - y), | |
b: 200 * (y - z) | |
} | |
} |
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