Had to look up exactly what dithering (as Egg mentioned) entails, but I believe that's the method to Nadia's madness.

Dithering is a process whereby non-standard colors are simulated by using various shades of the 16 we're limited to. It's an extrapolative (semi-intelligent "figuring out") process -- a sort of clever robot hack on the existing pallette. Photoshop can do it on the fly. That's what I understand the word to mean anyway.

- F