Created
March 19, 2012 18:02
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RGB to HSL to RGB
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function RGBToHSL(r, g, b) { | |
var | |
min = Math.min(r, g, b), | |
max = Math.max(r, g, b), | |
diff = max - min, | |
h = 0, s = 0, l = (min + max) / 2; | |
if (diff != 0) { | |
s = l < 0.5 ? diff / (max + min) : diff / (2 - max - min); | |
h = (r == max ? (g - b) / diff : g == max ? 2 + (b - r) / diff : 4 + (r - g) / diff) * 60; | |
} | |
return [h, s, l]; | |
} | |
function HSLToRGB(h, s, l) { | |
if (s == 0) { | |
return [l, l, l]; | |
} | |
var temp2 = l < 0.5 ? l * (1 + s) : l + s - l * s; | |
var temp1 = 2 * l - temp2; | |
h /= 360; | |
var | |
rtemp = (h + 1 / 3) % 1, | |
gtemp = h, | |
btemp = (h + 2 / 3) % 1, | |
rgb = [rtemp, gtemp, btemp], | |
i = 0; | |
for (; i < 3; ++i) { | |
rgb[i] = rgb[i] < 1 / 6 ? temp1 + (temp2 - temp1) * 6 * rgb[i] : rgb[i] < 1 / 2 ? temp2 : rgb[i] < 2 / 3 ? temp1 + (temp2 - temp1) * 6 * (2 / 3 - rgb[i]) : temp1; | |
} | |
return rgb; | |
} |
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I am not sure about the HSLToRGB function because when you convert HSL(0,0,92) to RGB, you will get [92, 92, 92] instead of [235, 235, 235].