Path: utzoo!utgpu!water!watmath!clyde!bellcore!decvax!ucbvax!agate!ig!uwmcsd1!leah!itsgw!imagine!pawl21.pawl.rpi.edu!jesup
From: jesup@pawl21.pawl.rpi.edu (Randell E. Jesup)
Newsgroups: comp.sys.amiga.tech
Subject: Re: 32 shades of gray
Keywords: gray scale
Message-ID: <498@imagine.PAWL.RPI.EDU>
Date: 9 Mar 88 07:22:12 GMT
References: <2801@gryphon.CTS.COM>
Sender: news@imagine.PAWL.RPI.EDU
Reply-To: beowulf!lunge!jesup@steinmetz.UUCP (Randell Jesup)
Organization: RPI Public Access Workstation Lab - Troy, NY
Lines: 20

In article <2801@gryphon.CTS.COM> richard@gryphon.CTS.COM (Richard Sexton) writes:
>I've been using this tip to acheive what looks for all the world
>like 32 gray scales.
...
>Now, to get the additional 16 shades of gray, dither 1:1 between
>every n'th color and it's n+1'th counterpart. Use the following pattern:

	Not only does it work for pure grays, but if you take a set of grays,
say 5, and 1 or two different shades of another color, and then use the
50% dither, you produce what appears to be several new shades of that other
color (MD Blue + DK gray = DK Blue, for example.  The gray and the color you
dither with can't be TOO far apart in luminance, or it's noticable, but in
general it is useful.

     //	Randell Jesup			      Lunge Software Development
    //	Dedicated Amiga Programmer            13 Frear Ave, Troy, NY 12180
 \\//	beowulf!lunge!jesup@steinmetz.UUCP    (518) 272-2942
  \/    (uunet!steinmetz!beowulf!lunge!jesup) BIX: rjesup

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