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I have no idea if i'm missing something crucial here but:
tint(0,0); tint(color(x,0)); tint(color(0,0));
Is giving different results... With the first line the image becomes invisible, with the second line you get a grey image if x > 0. With the third line however the image becomes black, and not transparant at all.
Is this a bug or does it have to do something with color representation?