Fountain of grays

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#657

From: Chung-Pang Lai
Date: Wed, 05 Jul 1989 22:43

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I am trying to produce a fountain of grays.  When I print the fountain on
a 300 dpi LaserWriter, I got 26 steps of grays (due to the 5x5 half tone
cell.)  At the default setting (150 line screen) on a 2540 dpi Linotronic, 
how many gray levels do I get?

Can someone explain how the maximum number of gray levels is related to
the various factors listed below?:
	screen number
	dpi
	angle of the halftone screen grids.

If I like to get a smooth continuous spectrum of grays on a 2540 dpi 
Linotronic, (I like to minimize the stepping effects) what kind of screen 
should I choose to get the best result?  And what is the PS code required
to do such change?

If this has been discussed before, can someone forward the article to me?

Thank you in advance.

-- 
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{pyramid, osu-cis, uunet, killer}!daisy!cplai    C.P. Lai
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Daisy Systems Corp, 700B Middlefield Road, Mtn View CA 94039.  (415)960-6961

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!decwrl!sgi!daisy!cplai
From: cplai@daisy.UUCP (Chung-Pang Lai)
Newsgroups: comp.lang.postscript
Subject: Fountain of grays
Keywords: screen, halftoning, dpi
Message-ID: <3134@daisy.UUCP>
Date: 5 Jul 89 22:43:48 GMT
Organization: Daisy Systems, Mt. View, CA
Lines: 25