To those who want to see what selecting "Colors, Invert Images" can do quick/easy, check out the link below. It is moderately NSFW.
The link is to a crackpot 'Be scared of the Gov't' website that I do not necessarily endorse, but hosts the images in question. I should also note that I have personally tried the invert (Using MS Paint believe it or not) and verified that it works.
http://www.prisonplanet.com/inverted...ing-color.html