RGB filters for different forms of color blindness

Question

My father is color blind and given that I work in games where the visuals are important, I\'ve always wanted to write a filter for screen shots (or even some type of shader) tha

Answer 1

Google came up with a number of links, perhaps one provides source or algorithm descriptions: http://www.google.com/search?hl=en&q=simulating+color+blindness&aq=f&oq=

Edit: Thanks Torlack for pointing out that everybody knows about Google. But using Google effectively requires using the proper search terms, and good search terms aren't always obvious. Judging by the returned page titles and a couple of the links, this particular search seemed highly relevant. I don't think it was a bad enough answer for a downvote.