Add files via upload

jquery.wh2tr.js

@@ -0,0 +1,45 @@
+
+
+(function($){
+	$.fn.wh2tr = function() {
+		var image = $(this).get(0);
+
+		var w = image.width, h = image.height;
+		var accuracy = $(this).data("accuracy");
+		if(accuracy == undefined)
+			accuracy = 1;
+
+		var canvas = document.createElement('canvas');
+		canvas.width = w;
+		canvas.height = h;
+
+		var ctx = canvas.getContext('2d');
+		ctx.width = w;
+		ctx.height = h;
+		ctx.drawImage(image, 0, 0, w, h);
+		var imageData = ctx.getImageData(0,0, w, h);
+		var pixel = imageData.data;
+
+		var r=0, g=1, b=2, a=3;
+		var cl = 255*accuracy;
+
+		for (var p = 0; p<pixel.length; p+=4){
+		if(
+			pixel[p+r] >= cl &&
+			pixel[p+g] >= cl &&
+			pixel[p+b] >= cl) // change alpha to 0
+		{ pixel[p+a] = 0; }
+		}
+		ctx.putImageData(imageData,0,0);
+
+		image.src = canvas.toDataURL('image/png');
+
+		return this;
+	};
+})( jQuery );
+
+$(document).ready(function() {
+	$(".wh2tr").each(function(){
+		$(this).wh2tr();
+	});
+});