Finding Waldo With Mathematica of the Day

Users of popular programming Q&A forum Stack Overflow have discovered a geeky way to cheat at Where's Waldo? (Where's Wally? outside North America) using a Mathematica algorithm.

Arnoud Buzing kicked off the discussion with a function that makes Waldo's trademark red-and-white shirt easier to spot by dimming all of the non-red colors in the image, but Heike took it to the next l