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From: mike@THUMPER.BELLCORE.COM (Mike A. Caplinger at thumper.bellcore.com)
Newsgroups: comp.laser-printers
Subject: PostScript, patterns, and device independence
Message-ID: <8707282034.AA20107@brillig.umd.edu>
Date: Wed, 22-Jul-87 16:58:09 EDT
Article-I.D.: brillig.8707282034.AA20107
Posted: Wed Jul 22 16:58:09 1987
Date-Received: Thu, 30-Jul-87 02:00:21 EDT
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I recently tried to print a PostScript document, produced and debugged with
an Apple LaserWriter, on a Linotronics phototypesetter.  One of the
illustrations in the paper was done with MacDraw, and used a variety
of dashed and patterned lines (using line patterns, which is the only
way to do dashed lines in MacDraw).  These looked just fine on the LaserWriter,
but on the Lino some of the lines disappeared completely, and others
looked the same when they were supposed to be different, and were different on
the LaserWriter.

This is a naive question, because I haven't thought through the interaction
of patterns with device resolution, but should this kind of thing be allowed
to happen?  One of the reasons I was so enthused about PostScript was
its total device independence, but this experience has told me that it
isn't quite as portable as I thought.

        Mike Caplinger
        mike@bellcore.com
        {decvax,ihnp4}!thumper!mike