|P is for Practical|
Re^2: I'm not a PhD but...by why_bird (Pilgrim)
|on Feb 04, 2009 at 15:39 UTC||Need Help??|
If you define colour in terms of what the human eye sees, there are only three of them
I think you're misconstruing me! I am limiting colours to be 'things which humans can see' which doesn't correspond to 'the specific frequency ranges which stimulate only one cone type'. (And in fact the frequency ranges overlap so your definition becomes a bit more tricky than you make out)
I can see EM radiation with wavelength 570nm (yellow), so I would define it as a colour! I just happen to see it by stimulating more than one cone type at once.
so if you define colors as wavelengths of electromagnetic radiation then the cardinality of the set of all colours in the rainbow is aleph-sub-one
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