In the Color Memory Game posted last month, you were challenged to recall a color you saw a few seconds ago. Another game takes the memory variable out of it, but it's still a challenge.
In the game What's My ΔE(OK) JND? you are given two colors at a time, and your job is to find the line between them. JND stands for Just Noticeable Difference, and you'll find a rather dense explanation of it here. That doesn't make the game any less fun.
You'll be given 40 pairs of colors. The first ten are very easy, but the rounds get harder after that as the color pairs become more similar. You will most likely notice that your screen needs to be cleaned. Or your glasses. Like the earlier game, you'll get some snarky comments along the way. Your score at the end may be confusing, but it appears that the lower the number, the better you did. My score was .0054, but you can beat that easily, since I have cataracts. -via Metafilter
My best and most common score for a complete game is 0.0013. I played it through several more times, with final scores of either 0.0013 or 0.0020.
It's not a surprise to me because I used to work in a laboratory, doing color matching, regularly finding differences between colors no one else could see until I changed the lighting on the samples to highlight the differences. My eyesight has gotten much poorer since then, but apparently I still see differences in color as well as I ever have.
What is a surprise is that my score is considerably lower than color theorists say is possible with the human eye, according to the feedback within the game.
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