These links seem relevant: http://stackoverflow.com/questions/934012/get-image-data-in-javascript http://stackoverflow.com/questions/366145/image-manipulation-with-javascript It is rather dependent on the browser though, since the <canvas> element is not (natively) supported in Internet Explorer, and probably not in most older web browsers. Another, possibly easier, solution is to simply use a proxy for the image, and cache the image at server side. Simon
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