getImageData & putImageData ! http://www.fujidig.com/misc/js/canvas/transparent-color-copy.html var Color = function Color(r, g, b, a) { this.r = r & 255; this.g = g & 255; this.b = b & 255; this.a = a; if (typeof (this.a) == 'undefined') …

getImageData!! http://www.fujidig.com/misc/js/canvas/trim.html var canvas = document.body.appendChild(document.createElement('canvas')); canvas.width = 200; canvas.height = 200; var ctx = canvas.getContext('2d'); for(var i = 0; i < 3; i++)…