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From: tyler@eniac.seas.upenn.edu (Tyler W Phillips)
Newsgroups: comp.sys.apple2
Subject: Re: More extended graphics on the IIgs
Message-ID: <36041@netnews.upenn.edu>
Date: 22 Jan 91 01:22:58 GMT
References: <1991Jan18.170510.1@gacvx1.gac.edu> <14908@smoke.brl.mil> <1991Jan20.123430.7039@ee.rochester.edu> <35978@netnews.upenn.edu> <42874@ut-emx.uucp>
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 In article <42874@ut-emx.uucp> ifar355@ccwf.cc.utexas.edu (David H. Huang) writes:
 >In article <35978@netnews.upenn.edu> tyler@eniac.seas.upenn.edu (Tyler W Phillips) writes:
 >>
 >>	Why does the alternating colors only yield 32 total.  You (meaning an
 >>uninformed you) would think that you could make any combination of 2 colors
 >>which would yield 15! (In other words, a lot) colors.
 >>
 >>P.S.  I think this would look great with a Zip or Transwarp
 >>
 >>tyler@eniac.seas.upenn.edu
 >
 >15! would be a combination of 15 different colors, not 2. BTW, my trusty HP
 >sez that 15!=1.307674368E12. That would be a lot of colors :-)
 >
 >There would only be 32 different colors since gray 4 and gray 6 will make
 >gray 5, which already exists. The possible intensities from this method are
 >0, 0.5, 1, 1.5, ..., 14.5, and 15. Hmmm... I guess that only makes 31 grey
 >levels...
 >
 >Also, I don't think a Zip or a Transwarp would make much of a difference
 >in terms of the picture quality... the screen can only be refreshed 60 times
 >a second.
 >
 >
 >-- 
 >David Huang                                 |
 >Internet: ifar355@ccwf.cc.utexas.edu        |     "My ganglion is stuck in
 >UUCP: ...!ut-emx!ccwf.cc.utexas.edu!ifar355 |      a piece of chewing gum!"
 >America Online: DrWho29                     |

	Granted, my math was a little off, but what I meant was to mix colors
in this fashion, not gray levels.  I would think that that would theoretically
give you 120 colors per scan line (16 x 15 / 2).  I would also think that an
accellerator would be very useful in keeping up with all 120 colors 
(especially if the 120 colors are different on each scan line = 120 x 200 = 
24,000 colors (although many would probably be indistinguishable)) although
it would probably not be enough anyway.

tyler@eniac.seas.upenn.edu

P.S.  I could be wrong.