[Printing-architecture] On the Continued Need for PostScript Workflows
cloos at jhcloos.com
Tue Jun 18 00:14:55 UTC 2013
I've been trying for months to write a whitepaper on this subject, but
haven't been comfortable with the tone I end up with. This is getting
more important, though. So I'll try to be succinct, even if that might
come off as blunt. Apologies in advance for feather ruffling.
*Any* conversion of PostScript into PDF in the print work flow -- ie, in
the cups filters -- is broken and unacceptable.
PostScript files exist; they do not magically disappear just because PDF
PostScript printers are still more common than PDF printers. And they
have *long* lifetimes. (In the US, printers have a five-year depreci-
ation schedule and one can expect a much longer service life.)
When printing an existing ps file -- including when printing from
programs which can generate ps but not pdf -- the postscript MUST be
modified only by pstops when sending on to a ps printer, or MUST be
rendered directly to a raster format when printing to printers which
require raster input.
Conversions can only cause damage.
Artifex refuses to ensure that gs' pdfwriter generates device indepen-
dent colour when given a source file with device independent colour
(evidently it is a large job for which they do not have a paying
customer). Cf the relevant WONTFIXes.
And it is not always even possible to convert jobs which use postscript
as a language into equivilent PDF. The formats are just too different.
It is perfectly OK -- even welcome -- to prefer PDF when the original
file is not already in a page description format or language.
But the only molestation a postscript file should endure is that
specified by the ppd and user-selected options.
James Cloos <cloos at jhcloos.com> OpenPGP: 1024D/ED7DAEA6
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