Rounding errors on LaserWriter II?

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#8232

From: Russ Chamberlain
Date: Thu, 13 Apr 1989 20:55

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I have experienced problems with character alignment on the LaserWriter II
at work.  The discrepancy shows up best when an 80x25 block of white-on-black
chars (an IBM PC screen dump of reverse-video chars) is printed.  I get 
blank lines (one LaserWriter-pixel wide) appearing as ugly white streaks; both
vertical and, more often, horizontal.

I set about to fix the problem, since the printouts involved are destined for
publication, and after intense sessions of swearing and hair-pulling, I heard
a rumor that some or all PostScript interpreters have a numerical rounding
error in them.  I also heard that there is a relatively simple fix.

Could someone please enlighten me?  Please send your replies to this newsgroup.


  - Russ Chamberlain

PS -- Sorry if this is an old topic, but I had this account made just to be
      able to read from and post to this news group. I'M DESPERATE!!

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Message-ID: <124@maytag.waterloo.edu>

Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!maytag!aries5!rjc

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!maytag!aries5!rjc
From: rjc@aries5 (Russ Chamberlain)
Newsgroups: comp.lang.postscript
Subject: Rounding errors on LaserWriter II?
Message-ID: <124@maytag.waterloo.edu>
Date: 13 Apr 89 20:55:16 GMT
Sender: daemon@maytag.waterloo.edu
Reply-To: rjc@aries5 (Russ Chamberlain)
Distribution: na
Organization: Computer Systems Group, University of Waterloo
Lines: 19