Javascript generate lighter darker color - Node.js CSS

Node.js examples for CSS:Color

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Description

Javascript generate lighter darker color

Demo Code


var colorLuminance = function(hex, lum) {
  // Validate hex string
  hex = String(hex).replace(/[^0-9a-f]/gi, '');
  if (hex.length < 6) {
    hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2];
  }/*  w  w  w  .  j a  v  a  2 s.c o  m*/
  lum = lum || 0;

  // Convert to decimal and change luminosity
  var rgb = '#';
  var c;
  var i;

  for (i = 0; i < 3; i++) {
    c = parseInt(hex.substr(i * 2, 2), 16);
    c = Math.round(Math.min(Math.max(0, c + c * lum), 255)).toString(16);
    rgb += ('00' + c).substr(c.length);
  }

  return rgb;
};

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