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help with transparency in SDL

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I just started using SDL today. I am able to make an image move on the screen, but I can''t figure out how to set the transparency using this statement: SDL_SetColorKey(surface, SDL_SRCCOLORKEY, SDL_MapRGB(surface->format, r, g, b)); I want to make it so green 255 is transparent, but I can''t figure out what to do with the surface->format statement. Can anyone help me out? Thanks in advance

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