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Jan
11-23-2002, 04:12 AM
Hi,

i would like to use the color matrix to adjust brightness and contrast. I read in a book how to do this, but it seems not to work:

glMatrixMode (GL_COLOR);
glTranslatef (0.5,0.5,0.5);

(I call those functions after glClear, but before everything is drawn.)

This should darken everything i think, but it just happens nothing.

I checked for error codes, but there are none. I checked the required extension (ARB_imaging), but itīs there (Geforce 2).
So, where could be the error?

Hope someone knows how to do it properly.

Jan.

tbfx
11-23-2002, 09:37 AM
Appears you are using it correctly.
What are you drawing?
Color Matrix should work with
glDrawPixels as well as glTexSubImage2D
but I dont believe it works with
primatives like lines or polys.

Also, wont work with the new ati radeon
drivers at all. Nvidia is generally supported
but slow slow slow.