On Thu 26 Jul 2012 at 17:10:12 +0000, Camaleón wrote:

> On Thu, 26 Jul 2012 17:27:26 +0100, Roger Leigh wrote:
> 
> > No, while PDF does perhaps allow such things, it's far far better than
> > PostScript.
> 
> (...)
> 
> PostScript is a languge for machines not for human beings. It does not 
> have to be "easy" but "accurate". One only have to read the full 
> specification manual of both to start guessing "why" (hint: one of them 
> has around 200 less pages) :-)
> 
> (note that I don't want my printer to "read" but "interpret" the document 
> I am sending it exactly "as is" and PS complexity is precisely for doing 
> so)

Roger Leigh gave a good explanation of the role played by PDF in the
CUPS printing process on Debian. You snipped most of it, including this:

   > A native PDF workflow is far, far better and vastly more
   > flexible than a native PostScript workflow.

To understand its importance you need a better reference than the one
given to a page on the cups website a few posts back. For example, there
is:

   
http://www.linuxfoundation.org/collaborate/workgroups/openprinting/pdfasstandardprintjobformat

To illustrate the difference between printing in the olden days and now
we'll take someone who has set up a print queue to send a job to a
printer as PostScript. A text file is sent to CUPS, which filters it.

   On Lenny:   text --> texttops  --> pstops ----> printer

   On Squeeze: text --> texttopdf --> pdftopdf --> pdftops ----> printer

Note that the printer still gets PostScript (which should make you
happy) and the advantages of the PDF workflow which have been described
occur at the pdftopdf filtering stage.


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