I'm glad to see someone above already posted about additive and subtractive colour mixing. I think I've been vaguely aware of the basic colours used in printing since peering into my first dot matrix printer but I note in more recent times that some higher end consumer grade printers offer quite a few more pigments than that. Also, not long after my introduction to dot matrix printers, I found out about 24bit colour palettes (8 bits each for red, green & blue - 32bit colour adds an 8bit alpha / transparency channel) and assumed that was the be-all and end-all of digital colour definition. Even then, in the '90s, that didn't last for long. 48bit colour has been around for quite a while - I've got no idea how popular / in-demand it is though... But keep an eye out (so to speak...) for displays (and cameras...) that go beyond the absolute necessity of red, green, blue colour production and 'mere' 24bit colour depth. Companies like Sharp already make displays using additional subpixel yellow... cnet article, Ultra HD 4K TV color, part I: Red, green, blue and beyond
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Even have to up-vote my own comments thanks to @asshole...