[Desktop_printing] Agenda proposal: Replace PostScript by PDF
asjob transfer format
hintak_leung at yahoo.co.uk
Tue Jan 10 01:43:39 PST 2006
--- Till Kamppeter <till.kamppeter at gmx.net> wrote:
> Another question: There are often problems with pre-processing
> PostScript (like re-ordering pages, scaling, n-up, ...) due to lack of
> DSC conformity. How easy/difficult is it to process PDF files?
Yes, I think the reasons Ralph stated are better ones for switching
to pdf :-).
Reordering pages, scaling, n-up are much easier with PDF than with postscript,
I think; that's just because Adobe had learned from postscript and made pdf
having metadata for describing the overall structure, and
pdf's are also randomly seekable/navigable based on the metadata.
(the xref table at the end and what not).
> Ralph Giles wrote:
> > On Mon, Jan 09, 2006 at 03:00:32PM -0800, Bastian, Waldo wrote:
> >>So far the case for PDF seems to be rooted in a vague notion that xpdf
> >>is better maintained than ghostscript.
> > I don't think this is a good way to state the case. As a Postscript
> > interpreter and rasterizer, Ghostscript is *extremely* mature, and
> > Adobe is not longer updating the Postscript specification, so there is
> > little actual need for code updates. As you suggest, I think the
> > argument is actually in the other direction from a security and code
> > stability point of view.
> > But if we were happy with code stability, we'd still be using lpr. :)
> > No, I think the case for migrating the print workflow to PDF rests
> > entirely on its features. In my view, the most important aspects of
> > this are:
> > a) better colour accuracy, especially with deep images and ICC profile
> > support. This is essential for graphic arts work, and helpful for
> > just printing people's digital photos.
> > b) native support for transparency, which greatly improves both file
> > size and scalability with resolution over Postscript for transparent
> > sources. Vector graphics with transparency are coming into
> > increasing artistic use and it is important to support them well.
> > c) portability. PDF is designed as a portable format much more than
> > Postscript is/was and that makes it a more natural format for
> > applications and drawing libraries to produce, and one of the
> > major document formats users will want to print. Very, very
> > few new users are working with Postscript files directly.
> > That's why we at Ghostscript believe it's important to switch, despite
> > the pain of new code and chasing Adobe's updates to the standard.
> > FWIW,
> > -r
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