How to disable the flash in Photobooth

I read this on a forum somewhere, I think it was at macrumors. You can take an iSight picture in Photo Booth without the flash washing out your photo by inverting the screen colors. That way you screen flashes black instead of white. Inverting your screen colors is kind of scary if you have never done it before or if you accidently do it. Just strike your pose in front of your isight. Its better to pose before inverting your screen because its gets kind of hard to see what your taking once you invert (in my experience).

To invert (and to go back to normal when your done), hold down crtl+option+apple and hit 8.

Then take your picture and invert back.