Just to clarify, I was referring to home systems, particularly the Genesis and PlayStation 1 (and I think the N64) where developers "cheated" additional colors and transparency effects beyond the system's true capabilities by employing dithering, exploiting the fact that the majority of people would be playing on a TV set using a composite or RF connection. Without the signal degradation causing adjacent pixels to blend together, the dithering is exposed and it looks really ugly. For example, the first Silent Hill on PS1 definitely exploited composite artifacts to simulate atmospheric fog effects, and it doesn't look very good on higher-grade video outputs (or on emulator).