> Ideally, you should use whatever color is going to be in the background when you show the image.
Agreed, but the problem is I'm making a collage of pictures where the new pictures are placed above previous pictures, so there's no one consistent background color. > Even better would be if you could blend it with a transparent background, and show it that way, > but that would require an alpha channel, and I don't think jpeg supports that. I'm converting to BMP and assigning an alpha channel so this is indeed a possibility. Another thought I had was making a drop shadow effect, which the thin gray edge outside of my white border already approximates. Interestingly, when I've tried making a transparent canvas in PIL (which I'd have to do to add an alpha border) in the past, I consistently got weird artifacts in the transparent areas. The workaround I used was to make a small blank PNG that was pure alpha and resize it as necessary. If I test out the alpha border I'll post back to this thread.
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