Edge blending of image with alpha on iOS after masking color?

You could try zooming the mask image larger by some multiple (say 2X, 3X or 4X) before creating the mask. Then a size-reduced copy of this larger mask might be better antialiased.

I've tried that as well - it smooths the pixels a bit, but they are still too jagged. – user1094590 Dec 13 at 22:50.

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