Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!elroy!cit-vax!tybalt.caltech.edu!wetter
From: wetter@tybalt.caltech.edu (Pierce T. Wetter)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Utilities for RGB to 8-Bit
Message-ID: <6604@cit-vax.Caltech.Edu>
Date: 19 May 88 19:53:34 GMT
References: <92@ai.etl.army.mil>
Sender: news@cit-vax.Caltech.Edu
Reply-To: wetter@tybalt.caltech.edu.UUCP (Pierce T. Wetter)
Organization: California Institute of Technology
Lines: 21

>
>	I have a 24-bit color image on VAX with UNIX:
>	    8-bit red
>	    8-bit green
>	    8-bit blue
>
>	I want to display this on Mac II, 8-bit video.
>
     Sure, get one pixel at a time from your unix file, then SetRGBColor to
  red*256, green*256, blue*256, then SetPixel(x,y). This saves programmer time
  at the expense of user time.

     You might also want to do dithering, best simple dither is 50% of one
  color + 50% of another color, but I don't know any dithering algorithms off 
the top of my head.

Pierce WEtter

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wetter@tybalt.caltech.edu     Race For Space Grand Prize Winner.
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   Useless Advice #986: Never sit on a Tack.