Re: Colors in Sherall

Robert B Wilson <han_solo55@...> writes:

> hmm... most kinsi rorotan speakers have color receptors that are
> sensitive to red, yellow, blue, and purple... i'm not sure what the word
> for the secondary color made by combining blue and red is, but i've had
> dreams where i could differentiate between red+blue and purple...
> also, sometimes i'll be just walking along and all of a sudden i see
> everything as completely red and completely blue at the same time (it's
> really weird and hard to explain), but not purple, and i can
> differentiate between things that are different colors (even though both
> are red and blue at the same time)...
Hmmm, there is no single wavelength range corresponding to "purple":
purple is ALWAYS a mixture of red and blue light and not part of the spectrum.
Magenta, which was mentioned in this thread, is a particular kind of purple,
defined as 100% red + 100% blue.

So there is no physical difference between "red+blue" and "purple",
and a colour receptor sensitive to purple light would have to be one
with two pigments, one sensitive to red and the other to blue light,
which only fires if both pigments are activated.  Such a receptor
*might* evolve in an environment where something important
(a food source, for instance) is purple.

But this is becoming off-topic.

--
Jörg.

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