How does one convert an image to grayscale in OpenGL?

You might be able to convince GL_DOT3_RGB to do what you want.

– twerdster Dec 29 '10 at 15:32 1 @twerdster: Here are some examples. – genpfault Dec 29 '10 at 19:10 Still seems weird to me that there has never been a simple way to do this. – twerdster Dec 30 '10 at 0:58.

Well I don't know about "fastest", but you should be able to do the opposite of this tutorial and get the greyscale image you're looking for. The techniques are the same just backwards. nehe.gamedev.net/data/lessons/lesson.asp....

He uses GLSL i.e. A shader – twerdster Dec 29 '10 at 15:29.

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