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    <p>In your demo code, you should be changing the temporary canvas width/height, not the context’s.</p> <pre><code> helperCanvas.width = image.width; helperCanvas.height = image.height; </code></pre> <p>Here is code with a test filter that just turns all non-transparent pixels red.</p> <p>It also renders the filtered canvas image to an image on the page.</p> <p>BTW, when creating an image object, there is a new Chrome bug that can be avoided if you create like this:</p> <pre><code> var img=document.createElement("img"); </code></pre> <p>Fiddle that must be viewed in Chrome or FF (IE==CORS failure): <a href="http://jsfiddle.net/m1erickson/LeGD5/" rel="nofollow">http://jsfiddle.net/m1erickson/LeGD5/</a></p> <p>Here is code: </p> <pre><code>&lt;!doctype html&gt; &lt;html&gt; &lt;head&gt; &lt;link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /&gt; &lt;!-- reset css --&gt; &lt;script type="text/javascript" src="http://code.jquery.com/jquery.min.js"&gt;&lt;/script&gt; &lt;style&gt; body{ background-color: ivory; } canvas{border:1px solid red;} &lt;/style&gt; &lt;script&gt; $(function(){ var canvas=document.createElement("canvas"); var ctx=canvas.getContext("2d"); var img=document.createElement("img"); img.onload=function(){ canvas.width=img.width; canvas.height=img.height; ctx.drawImage(img,0,0,img.width,img.height); // test -- turn every non-transparent pixel red var imgData = ctx.getImageData(0, 0, canvas.width, canvas.height); var pixels = imgData.data; // get pixel data for (var i = 0; i &lt; pixels.length; i +=4) { // if this pixel is not transparent, // mask it in pure red if(pixels[i+3]&gt;0){ pixels[i]=255; // this is the red component of the pixel pixels[i+1]=0; // this is the green component of the pixel pixels[i+2]=0; // this is the blue component of the pixel pixels[i+3]=255; // this is the alpha component of the pixel } } ctx.putImageData(imgData, 0, 0); var theImage=document.getElementById("theImage"); theImage.src=canvas.toDataURL(); } img.crossOrigin="anonymous"; img.src="https://dl.dropboxusercontent.com/u/139992952/stackoverflow/KoolAidMan.png"; }); // end $(function(){}); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;img id="theImage" width=300 height=300&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. COthank you markE !!!
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