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rgb transparacy (sdl)

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I want to make a sertian collor be transparesnt in sdl, how do I use SDL_SetColorKey() properly? it crashes the program on me. I am not using sprites, I am trying to get the color transparent.

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Make sure the image loaded correctly. You could also use:

int r=0, g=0, b=1;
if(img)
SDL_SetColorKey(img, SDL_SRCCOLORKEY, SDL_MapRGB(img->format, r, g, b));
SDL crashes if you try using the pointer that hasn't been loaded into. Check sdlerr.txt .

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