#CD Writes
I think "illegal NTSC color" has to do with the color values, not whether the
RGB value is built up with 24-bit, 18-bit, HAM or whatever color. You can make
the same bad colors in any system. Making legal NTSC colors is a matter of
understanding the limits of how fast the color signal can change across a scan
line, and limiting the total color saturation of some colors. Color TV can
only handle a relatively small number of complete color swings across a single
scan line. To put it another way, there are some sequences of colors that
aren't "legal" in NTSC.