palettes
mapping:
256 colours (8 bits) _ selection of full (24 bit) RGB
options:
application palettes (why funny things happen!)
system palette (slightly different between platforms)
web colours
6 colour levels for each RGB channel 6x6x6 = 216
combinations of hex 00,33,66,99,cc,ff
e.g. #cc3300, #0000ff, #999999
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