Is there anyway to treat black as transparent in AppGameKit rather than using transparent png files? I have been using those fine in the main however I have a sprite animation which I want to include. It has a black background and I can't see any way to replace that with a transparency in a paint package ( the sprite has 42 frames and would be a nightmare to try to edit each one, especially as it fades to black also.)
Really, I could do with treating just that sprite (the rest are have transparencies) in the same way I used to use them in DB, by treating black as transparent. I actually generated the sprite using a program and so am stuck with black as the background for this and possibly a couple of others.
Other than that is there a real fast and easy way in a paint package to edit them manually? I have tried colour replace, but it looks horrible(offshades of black remain where there shouldn't be etc) and will take a fair bit of work

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Any ideas would be great!