> When 4 colours are needed (in board games, for example) it's usual to pick 
> Red, Blue, Green and Yellow, you can add some kind of Purple. Other 
> "secondary" colours like cyan and orange begin to lose contrast.

oh! This is good!  I believe it's the same kind of colors that are used 
in maps to make every adjacent territories have a different color...  Good!


> In case you don't know, it was John Dalton, the father of the Atomic Theory, 
> who gave name to daltonism, he was colour blind and studied that condition. 

I didn't...  I wonder if working in an atomic lab for long can render 
someone color blind! hehe

> I've always wondered how would colour blind persons see the colours, in 
> fact, I wonder how do other people see the colours: do other people 
> experience the same "feeling" when seeing blue as I do? They receive some 
> sensation when looking at the sky, and they call it "blue", I do the same 
> thing, but this doesn't mean that the sensation is the same...

Well, I came to a good personnal explanation of how things work in my 
brain...

Consider the perception of colors on the retina as a POV pigment{} for 
every pixels of my vision...  Then think that we see a 24bit image 
containing information for Red, Green, Blue.  Then there is 8bits for 
every colors, combined they form the 24bit image normal people "see". 
But my daltonism makes the Red pigment shrink to... say 4 bits.  Red 
pigment looses precision.  My view is of 20bits.  But my brain only 
accepts 32bit, so at some place the red pigment is scaled to 8bit, and 
unfortunately, the scaling is done unproperly, so the final image I see 
is wrong or imprecise.

As for sensation, you see, color is a perceived information, nothing 
more, the information is always and ever 24bits long.  And this said, 
the information will make the same kind of sensation in me because once 
the color has been processed, my cognitive judgment of the color is not 
affected by daltonism...

So, I believe, I see everything as you guys do...  But I would have 
difficulty identifying precise shades of color.  In the army, if I'd go 
to war in a jungle, where everything is green/brown and then ennemy is 
also dressed in green/brown clothes, I would definately have a hard time 
finding the ennemy!

Hope this answers your wonders!
   Xilo



-- 
Dedicated to audio/visual and interactive artwork.
Author of The Primary Colors of CSound:
http://www.geocities.com/simonlemieux/PCCS/index.html

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