Looks like something interesting has been developed to help people with colorblindness distinguish colors in charts, etc. http://www.colorhelper.com
Here's their description:
EyePilot Color Guide Software is an easy to use, interactive software program that enables you to work more effectively with color information. Using eyePilot, you can better understand and work with a wide range of color-dependent web sites, documents, graphics and computer applications. eyePilot helps to end confusion around the use of color graphics such as pie charts, maps, web links and data plots.
eyePilot is designed as an interactive floating window (Capture Window) that can be layered over any web or browser window on your computer screen. The eyePilot tools then can be put to work.
Gray: Isolates all instances of a single color by keeping everything that is that color unchanged and graying out all other colors. This makes it very clear which content is represented by a specific color.
cell phone coverage maps
Flash: When any spot of one color is clicked on, this tool flashes as white or black all other instances of that color in the frame.
Name: When the name of a color (red, green, orange, etc.) is clicked on in a list, this tool flashes as white or black all instances of that color in the frame.
Hue: This tool interactively the rearranges all the colors in the capture frame, allowing you to find a setting where the color information is more easily differentiated.