X-rite has a really neat online Farnsworth-Munsell 100 hue test that you can use to test your color vision. I want to be completely clear that I make no guarantees about the accuracy of this test though. I performed it on a new LED backlit LCD which has particularly vivid colors and scored a 107 on it which is considerably better than my performance using the real thing in a proper viewing booth with a calibrated light source (I got an average of 163 under those conditions). There are a number of reasons the scores could be different as in my case, the least of which is a screen with extra saturated colors. Still, if you want to see what taking the Farnsworth-Munsell 100 hue test is like, this is as close as you're probably going to get on your computer.
What does color blindness look like?
If you've stumbled across this site by accident or because you are curious about how being color blind affects people, you might appreciate getting a sense of how the world appears to a color blind person. There are a number of sites out there that provide demonstrations of color blindness. Here I'll mention some of the web sites and tools that have been made available to people who are "color normal" and some of these will likely result in another post on tools for the colorblind. At Vischeck tools are made available to allow the color normal to see what the world looks like to a deuteranope, tritanope or protanope. They also have tools available for the color blind to make it easier for them to tell certain colors apart, which I will test and hope to report on later.
Other color blindness simulators: Upload an image and see it as a deuteranope, protanope or tritanope. Mac compatible program that simulates color blindness. Interactive Java simulation. Provides examples of images viewed by different observers. Thanks for the link Joey!
I unfortunately cannot attest to the accuracy of any of these for obvious reasons!
An interesting tool on the market now is provided by Eizo for their LCD displays which are definitely some of the best out there. This tool allows the display to go in to a protanope or deuteranope mode, mimicking how the image would appear to someone afflicted with those more severe color vision defects. It is available on some of their new FlexScan models.