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I've actually used this technique before. You can also use an SVG clip path to do something similar in Firefox. When I used this technique I shipped the mask as a separate file as I wasn't familiar enough with the file format to realize I could attach it. The 63KB limit when attaching the mask to the image might be too close.

If you make an app that can take a PNG and convert it to JPEG with alpha channel can you let me know? I would be VERY interested in this.



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