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The color matrix and glDrawPixels()

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Hi! When I draw an image with glDrawPixels() everything works fine. But when I change the contrast or brightness with glScalef() and glTranslatef() on the color matrix, the rendering slows down A LOT! This only happens when I draw with glDrawPixels(). Is it supposed to be like that? Is there any way to make it faster? Thanks!

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color matrix is prolly not supported on your card thus gets done in software (hence the slowdown)

http://uk.geocities.com/sloppyturds/gotterdammerung.html

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But it''s not slow if I draw textured quads or triangles, only when I draw with glDrawPixels()...Anyways, is there a way to change the contrast, brightness etc. without making any changes to the color matrix?

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