Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!uunet!munnari.oz.au!murtoa.cs.mu.oz.au!murdu!ucsvc!u5569462
From: U5569462@ucsvc.ucs.unimelb.edu.au (DAVID CLUNIE)
Newsgroups: comp.graphics
Subject: Re: VGA Colors
Message-ID: <391@ucsvc.ucs.unimelb.edu.au>
Date: 11 Nov 89 23:27:00 GMT
References: <824@uwm.edu>
Organization: The University of Melbourne
Lines: 17

> I would assume that I should have gotten 256 varying shades of grey.
> But I didn't.  I got 4 sections of 64 shades of grey,  were each section
> had the same 64 colors.
> 
> How would I get 256 DIFFERENT shades of grey?

As others have already pointed out you can't because of the 6 bit DAC's in the
vga. Interestingly, someone mailed me a palette that aims to simulate more than 
64 shades of grey by using colors very close to grey. I have tried it and
really can't perceive the difference between it and just using a 6 bit grey
scale.

Which brings me to the point that I have read somewhere recently (can't
remember where) that the human eye CAN'T distinguish any more than 64 different
shades of grey. Is this so ? Do people beleive it ?

Regards ... David