I've done this in the early '90s, when I implemented all published algorithms back then into a Turbo Pascal program, which was allowing me to see full-color images on poor post-Soviet color displays - it wasn't just doing dithering, but also allowing you to pan and zoom, while switching algorithms. Give the limitations of the hardware, I had to implement the algorithms with a running buffer, optimized for panning, i.e. incrementally dithering the image. As some could guess, not a small part of these images was erotic. The program also was able to print on a matrix printer and I was improving it and had some test printouts in my bag. As I was in high school back. At one point some kids put a classroom on fire and they were doing an investigation, so, at one point they asked me to open my school bag and show them the contents. And, yes, I got into a big, big trouble. It was really tough to provide a meaningful explanation that I had only limited set of true-color images and, of course, the most popular were erotic given the post-Soviet interest in erotica and pornography. So, every time when I read something about dithering here on HN, it brings back my memory of being taken to the police station by two cops in front of the entire school for "distributing pornographic materials".