iPhone app corrects for color blindness Dec 16 2010
The vast majority of color blind people are in fact what are known as anomalous trichromats. They still have three photoreceptors, but the 'green' receptor is shifted a bit towards red. The effect is subtle: Certain reds might look like they were green, and certain greens might look like they were red.
Thus the question: Was it possible to convert all reds to a one true red, and all greens to a one true green?
The answer: Yes, given an appropriate colorspace.