How well can you judge color changes?

I found this interesting Color IQ test which I thought would be especially fun for painters to try. It takes a few minutes, so don't get impatient, and it may strain your eyes, but I wanted to see my results. The lower number you get, the better, and it tells you which hue(s) you have trouble correctly seeing. Make sure that your monitor is calibrated for optimum viewing!

I got a 4, with a particular weakness in greens.