Hi all! I''ve a Problem with glReadPixels. I want to read RGBA Values from a buffer. But if I want to read the pixels the RGB Values are read correct but nut the alpha values. The alpha value always is 255 (I''m reading unsigned bytes). I have (0,0,0,0) as the clear color and sending the colors for rendering with glColor4f (and alpha is not euqal to 1.0f). But it doesn''t work! Any ideas?? Thanks a lot Corrail

You sure you have a destination alpha channel? If you don''t ask for one, you won''t get one.

Thanks for you quick answer!

But how can I set a destination alpha channel up? Or what do I have to do to use it?

Thanks, problem is solved!!