Convert RGB Color to HSL Color - Node.js CSS

Node.js examples for CSS:Color

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Description

Convert RGB Color to HSL Color

Demo Code

Util.RGB2HSL = function(rgb) {
  var r = rgb[0], g = rgb[1], b = rgb[2];
  r /= 255, g /= 255, b /= 255;/*  w w w  .  ja  v  a 2  s .c om*/

  var max = Math.max(r, g, b), min = Math.min(r, g, b);
  var h, s, l = (max + min) / 2;

  if(max == min){
    h = s = 0; // achromatic
  } else {
    var d = max - min;
    s = l > 0.5 ? d / (2 - max - min) : d / (max + min);

    switch(max){
      case r: h = (g - b) / d + (g < b ? 6 : 0); break;
      case g: h = (b - r) / d + 2; break;
      case b: h = (r - g) / d + 4; break;
    }
    h /= 6;
  }

  return [h, s, l];
}

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