Canvas tainted by cross-origin data

Question

I\'m loading a motion jpeg from third-party site, which I can trust. I\'m trying to getImageData() but the browser (Chrome 23.0) complains that:

Answer 1

You cannot reset the crossOrigin flag once it is tainted, but if you know before hand what the image is you can convert it to a data url, see Drawing an image from a data URL to a canvas

But no, you cannot and should not be using getImageData() from external sources that don't support CORS