37 lines
909 B
JavaScript
37 lines
909 B
JavaScript
//put in red green blue values and get out hue saturation luminosity values
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function rgbToHsl(argument0, g, b){
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var r;
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//if the first argument is an object
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if (typeof argument0 === 'object'){
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r = argument0.r;
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g = argument0.g;
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b = argument0.b;
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}
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else
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r = argument0;
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r /= 255, g /= 255, b /= 255;
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var max = Math.max(r, g, b), min = Math.min(r, g, b);
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var hue, saturation, luminosity = (max + min) / 2;
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if(max == min){
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hue = saturation = 0; // achromatic
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}else{
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var d = max - min;
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saturation = luminosity > 0.5 ? d / (2 - max - min) : d / (max + min);
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switch(max){
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case r: hue = (g - b) / d + (g < b ? 6 : 0); break;
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case g: hue = (b - r) / d + 2; break;
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case b: hue = (r - g) / d + 4; break;
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}
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hue /= 6;
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}
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return {h:hue, s:saturation, l:luminosity};
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}
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