encode and decode img from base64

imgtobase64.js

/*
 * creator: Danj (https://github.com/DanBrothers)
 * description: encode and decode img from base64
 * license: MIT, please link to this if you copy (thanks)
 * 
 * usage:
	var base64 = getBase64FromImage(document.getElementById("imageid"));
	var img = getImageFromBase64(base64);
 */

function getBase64FromImage(img) {
	var canvas = document.createElement("canvas");
	canvas.width = img.width;
	canvas.height = img.height;
	var ctx = canvas.getContext("2d");
	ctx.drawImage(img, 0, 0);
	var dataURL = canvas.toDataURL("image/png");
	return dataURL.replace(/^data:image\/(png|jpg);base64,/, "");
}

function getImageFromBase64(base64) {
	var image = new Image();
	image.src = 'data:image/png;base64,' + base64;
	return image;
}