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@TengoHipo It is an indexed colour palette, which is how many (but not all) graphics systems on 1980s and early 1990s microcomputers worked. You have a list containing a number of colours called the palette, and the colours in the palette can sometimes use up to 24 bits (8 per primary colour), but the individual pixels use much fewer bits since they don't encode the actual colour of the pixel but just its colour index number. This is pretty neat because it means that you can use the same image for different purposes by just changing its palette, or even create pseudo-animation by using colour cycling.