Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!oliveb!amiga!boing!dale
From: dale@boing.UUCP (Dale Luck)
Newsgroups: comp.sys.amiga
Subject: Re: grey scale --> HAM picture
Message-ID: <613@boing.UUCP>
Date: 1 Feb 89 02:14:12 GMT
References: <6432@thorin.cs.unc.edu> <sXtR57y00VsI8ieaZL@andrew.cmu.edu>
Reply-To: dale@boing.UUCP (Dale Luck)
Organization: Boing, Milpitas, Ca.
Lines: 19

In article mp1u+@andrew.cmu.edu (Michael Portuesi) writes:
#skinner@unc.cs.unc.edu (Andrew Skinner) writes:
#> Does anyone have any free source code I could use
#> to convert (8 bit greyscale) images to HAM mode? 
#
#There is no need to use HAM mode for greyscale images.  The Amiga
#display hardware can only generate 16 shades (4 bits) of grey, which can be
#displayed simultaneously in any resolution without using HAM.  Better
#for you would be a program that converts 8 bit greyscale to 4 bit
#greyscale, and saves the results in IFF.
#

Not completely true, by using the mono output of the 500 or the 2000 you
can get closer to few thousand shades of grey. The rgb values are weighted
differently to produce a single luminance value. It is probably close
to .587g .299g and .11b or something like that.
-- 
Dale Luck     GfxBase/Boing, Inc.
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