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Sprites and opengl question

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Is there an easy way of setting a transparent color that will not be displayed in bitmap textures? I'm starting a simple 2d rpg and would like to avoid using seperate masking textures, is this possible? If it is not, then does anyone know an easy way of creating a mask for a bitmap? I'm using openGL and c++ Thanks for your help!

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Is there a problem with using 32 bit colour? This is what the alpha channel is for.

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