How do I adjust the color levels within open gl?

My old asus drivers used to have a function that allowed me to do this but I have since upgraded to a leaked version of the ge force 2 mx drivers without any extra functions.

So my question is, is there a program that will allow me to change the color and brightness levels in open GL without ****ing with my desktop gamma (which I prefer somewhat dark)

(I’m a vampire slayers <a half life mod> junkie and all the maps are dark which is why I have to do this)

BTW please dont suggest 3deep, cuz I’ve tried that one and it messes with my desktop and printer settings)

Oh and thanks in advance!