qodesmith

function avgColor(imageUrl) {
  var canvas = document.createElement('canvas');
  var context = canvas.getContext && canvas.getContext('2d');
  var rgb = {r: 102, g: 102, b: 102}; // Set a base colour as a fallback for non-compliant browsers
  var pixelInterval = 5; // Rather than inspect every single pixel in the image inspect every 5th pixel
  var count = 0;
  var i = -4;
  var img = document.createElement('img');
  var data;
  var length;