--- In [email protected], "Gilles Roux"
<[EMAIL PROTECTED]> wrote:
> We'd need some expert in color discrimination by the human eye to tell
> the perfect set of colors for speed-cubing. Black may be one of them.
Yes, we do need an expert to help.
But, disregarding that, we could make a start by selecting colours that
are entirely unlike all other colours. For example, you would rule out
purple, because we perceive it as both "bluish" and "reddish". Those
fundamental colours that are unlike all others are usually called the
psychological primaries (PPs).
For centuries, artists have agreed that the PPs are red, yellow, blue,
and green. Lay those 4 out on a circle with R opp G and Y opp B and
you can fit all other colours into the gaps -- as you probably did in
art classes at school.
[There is supposed to be a good physiological basis for the 4 PPs, too:
it is /not/ based in the retina -- where there are only 3 kinds of
colour receptor -- but in the way that colour information is
transmitted from eye to brain. My limited understanding of this is
that there is a red/green channel (which transmits EITHER R OR G
information, but not both) and a blue/yellow channel (similarly).]
So that gives 4 colours that it should be hard to confuse in good
light. Perhaps the non-colours black/white could be used for the other
2 faces, but (personally) I have found that black makes me feel vaguely
uncomfortable -- it looks too "empty" on a cube.
Mike
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