[Desktop_printing] Agenda proposal: Replace PostScript by PDF
asjob transfer format
till.kamppeter at gmx.net
Tue Jan 10 01:34:23 PST 2006
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?
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.
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