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From: josh@turb01.dmc.com
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To: grassu-list@max.cecer.army.mil, <gibb@hubers.cecer.army.mil>
Subject: Postscript
X-Mailer: <PC Eudora Version 1.4>
As in many languages, there is postscript and there is postscript. Many
programs such as pbmplus of image alchemy can convert images (pixelmaps) to
and from postscript format. But this is not vector format. Ghostscript can
convert a "vector" postscript file to an image but not back. The native
"vector" or "object-oriented" file formats for Adobe Illustrator and
Interviews idraw are true "postscript" in that you can dump the file
directly to a postscript printer. However both of these are very specialized
dialects of postscript, and neither program can read / edit an arbitrary
postscript file. Rumor has it that a new version of Illustrator (5.5?) will
be able to read in and edit the Adobe Exchange format of postscript. It may
be that the "Exchange" dialect of postscript can be created from any
arbitrary postscript by Adobe Acrobat Distiller (this may require a
postscript printer or other licensed interpreter to function). If this
capability does exist, then any arbitrary postscript file will be editable
by Illustrator...for a price.
At present, the most practical means of editing postscript images on a
workstation is a text editor side by side with either ghostview or xpsview
(Display Postscript), and practical knowledge of the particular postscript
dialect used by whatever produced your postscript file. Fortunately, most
programs with a postscript output option rather than a postscript basis
generate fairly simple forms of postscript without the extensive convoluted
nests of macros and definitions typical of a Mac or Windows (or Illustrator
or Canvas) postscript file.
Another practical step would be output files in the idraw form of
postscript, but in most cases this would mean completely rewriting the
postscript output routines such as ps.map...
It's surprising that no one has made more of an effort at an editing or
conversion program which takes off from ghostscript's postscript parsing
abilities, but I do not know of any to date. Any volunteers?
Cheers,
Joshua Lieberman, Ph.D.
ENSR Consulting and Engineering
josh@turb01.dmc.com
Joshua Lieberman, Ph.D. josh@turb01.dmc.com
ENSR Consulting and Engineering wasser@world.std.com
35 Nagog Park, Acton, MA 01720 508-635-9500