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From: jbm@aurora.UUCP
Newsgroups: comp.graphics
Subject: Re: Amiga World Ray-tracing article...
Message-ID: <662@aurora.UUCP>
Date: Fri, 17-Apr-87 13:54:04 EST
Article-I.D.: aurora.662
Posted: Fri Apr 17 13:54:04 1987
Date-Received: Sat, 18-Apr-87 06:11:43 EST
References: <239@rocky.STANFORD.EDU>
Distribution: comp
Organization: NASA Ames Research Center, Mt. View, Ca.
Lines: 28

in article <239@rocky.STANFORD.EDU>, ali@rocky.STANFORD.EDU (Ali Ozer) says:
+ 
+ In article <647@puff.WISC.EDU> beilke@puff.WISC.EDU (Matthew Beilke) writes:
+>Make that 320X400 6-bit H.A.M.  The Amiga doesn't have the capability to
+>display > 6 bit planes.
+ 
+ Despite that (just to set the record straight for comp.graphics 
+ readers not familiar with the Amiga), the Amiga can display 4096 
+ colors at once, using 6 bit planes.

Could you elaborate a bit on how they achieve this remarkable feat?
(No sarcasm intended.)

With the systems I have used (a set not including the Amiga):

# colors that can be displayed AT ONCE = 2 ** ( # of bit planes )

# of "distinct" colors = 2 ** ( r_DAC_bits + g_DAC_bits + b_DAC_bits )

The word distinct is quoted since rgb triples which are distinct
from a programming standpoint may not be perceptually distinct.


-- 

	Jeff Mulligan (jbm@ames-aurora.arpa)
	NASA/Ames Research Ctr., Mail Stop 239-3, Moffet Field CA, 94035
	(415) 694-5150