Wow, I honestly got "Perfect Color Vision" on my first try.
I then went back and moved just one tile over one space, and checked what my score would be, and that then gave me a score of "3".
It was definitely at least partially luck as there were a few tiles I was unsure of.
This was done on a low quality HP matte LCD monitor at work.
edit: Just read through the thread and saw that I wasn't the only one. Oops, sorry for the pictures and getting so excited.
I remember taking this a few years back and getting in the 20s.