Oh, I'm not sure where, exactly, it is, but the manual should tell you where to find it. It popped up on the screen the first time I used the program (after installing it) and I haven't needed it since. It's a good idea to "re-visit" this setting every six months or so, as monitors will tend to drift over time due to the aging process on the phosphors in the picture tube. Back when they used mostly tubes in monitors & TV's, it drifted a lot more frequently. Some of the upscale monitors will self adjust by examing the color profile in software(the high end Apple monitors will do this). -Jim