Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!pasteur!agate!ucbvax!husc6!contact!umb!ram
From: ram@umb.umb.edu (Robert Morris)
Newsgroups: comp.lang.postscript
Subject: Re: I need a finer setgray
Summary: typesetting is only the start
Message-ID: <732@umb.umb.edu>
Date: 5 Jan 89 00:24:17 GMT
References: <21801.1989Jan3.12:29:38@hammer.me.toronto.edu> <13321@ico.ISC.COM>
Reply-To: ram@typo.umb.edu (Robert Morris)
Distribution: na
Organization: Dept of Math and CS, UMass Boston.
Lines: 11

Replying to a plea for better screening, mar@athena.mit.edu advises
typesetter output. I concur, but it has been my experience that a
random Linotronic and a random LaserWriter, even if both are well
maintained, have radically different transfer functions.  Contrasts
which are satisfactory on one are not necessarily satisfactory on the
other. You can expect to have to make several iterations with the
typesetter, twiddling the transfer function in your PostScript to
increase or decrease the contrast. Further, the final reproduction
process may also have substantial impact on the contrast, and what you
really can expect is the possiblity of iterating again. So don't leave
it until the last minute....