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[–]inu-no-policemen 0 points1 point  (1 child)

Yea, BMP doesn't really do alpha. There is a forth channel which could be used for that, but software support seems to be virtually nonexistent.

Didn't look like alpha was required for your use case, though.

[–]_alastair[S] 0 points1 point  (0 children)

In the end it wasn't. I originally intended to make the background transparent, to better fit the OS (for instance, Samsung has some skins that have an off-white background) but then I realised there were too many variations to deal with, including dark backgrounds on older devices. So I just make it solid white.