I've gotten pretty good at doing the reverse operation(given an RGB value, guess the color) because I'm red-green colorblind and that's how I figure out what color something is :)
Re:All RGB colors in one image
by robinhouston on Tuesday March 04, 2014 @07:39AM
(#7339807)
The converse game exists: http://yizzle.com/whatthehex/
Edit: Actually, so does the “guess the RGB given the colour” direction, but I don’t find it as fun: http://mallory.jemts.com
Actually, that sounds kind of like a fun challenge game: name a color, then try to guess RGB values for that color.