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

I have these transformations and code explained in detail on my color blindness page. Essentially, for each type of color blindness you first linearize the RGB values then apply a transformation matrix (this is a product of 5 matrices that I list individually) and then clip to [0,1] and de-linearize back to sRGB.

For example, for deuteranopia, the matrix product is

 0.33066007 0.66933993 0
 0.33066007 0.66933993 0
-0.02785538 0.02785538 1   

This is a combination of: rgb -> XYZ -> LMS -> deuteranopia correction -> XYZ -> rgb.

You can download my R code that illustrates these calculations.

Answer 2

Can't help you on algorithms, but the following article was quite an eye-opener (excuse the pun): http://critiquewall.com/2007/12/10/blindness.

Ah, actually, http://www.vischeck.com/ is useful.