From: Vic 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 Lines: 19 Message-ID: <344A2EEE.164C@cam.org> References: <19971017150215 DOT 21713 DOT qmail AT hotmail DOT com> <34484B24 DOT 662C AT netunlimited DOT net> NNTP-Posting-Host: dynamicppp-178.hip.cam.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Precedence: bulk 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...