There will be a console command for disabling the color grading entirely in the game included with the next PC game client update. We believe that turning it off gives no major competitive advantage/disadvantage.
IRNV scope and a few others which turn the image into greyscale or greenscale don't work properly without color grading and will look real ugly.
There will be no in-game UI for turning it on/off.
We are unlikely to handle support questions and bug reports regarding stuff that happens when color grading is disabled.
"Both the “left” and the “right” pretend they have the answer, but they are mere flippers on the same thalidomide baby, and the truth is that neither side has a clue."
- Jim Goad