http://www.nicholsonprints.com/Articles/colorblind.htm The article that I've chosen is "Even a Color Blind Person Can Color-Correct a Photo" from Nicholson Prints. The website is a personal photography site. The article gives reasons for how a person can be color blind and still be a photographer and color-correct. It also has a few tutorials on how it can be attained.
You will have to start preparations by making levels adjustments to find the black and white points of the image. You will have to find a gray point as well. The article also mentions further that you will have to do things such as reset the RGB, and finding the average of the RGB values