From:	Vic <tudor AT cam DOT org>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: ALLEGRO - 256 shades of grey?? How?
Date:	Sun, 19 Oct 1997 12:01:50 -0400
Organization:	Communications Accessibles Montreal, Quebec Canada
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Message-ID:	<344A2EEE.164C@cam.org>
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To:	djgpp AT delorie DOT com
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Sean Gilley wrote:
>  on a related note. we humans can only see about
>  60,000 distinct colors/shades.
which is simply not true. It was proven in JPL tests in the 70's that
the human eye can only distinguish 16 *million* colors on a *display*
because the eye does not work well with that type of emittors.The human
eye is decoding the color in RGB. So in the end it's a matter of
distinguishing between 256 values of reg, green or blue. The brain does
the rest. The JPL guys discovered that on a paper (or a surface, not a
display) the eye can distinguish around 50 million colors. 
They (The JPL guys) had the abbility to print approx. 50 million
distinct colors. The guys that were tested could read a text written
with a color that differed only by an index value from the background
color.The eye is great at detecting edges and color variations.
And saying an eye can only see 20 shades of gray is ridiculous...
-- 
--> http://www.cam.org/~tudor <--
Go ahead and build another Messiah
We dig another grave...

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