Hello, When I blit an image such as this (generated dynamically with PIL, and saved here by pygame.image.save)- http://xs432.xs.to/xs432/08412/mask808.png to this screen, using the line "screen.blit(mask, (0, 0), None, BLEND_RGBA_SUB)"- http://xs432.xs.to/xs432/08412/screen136.png it results in this- http://xs432.xs.to/xs432/08411/tsukiyo3634.jpg
Is this what is supposed to happen? It seems to me that BLEND_RGBA_SUB should respect the the alpha of the surface being blitted and avoid subtracting the fully transparent gray pixels. Of course an alternate solution is to get rid of those gray pixels, but I'm wondering whether it is a bug in pygame, or if there is a solution that doesn't require altering the way the surface is generated.