From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Tue, 12 Aug 2008 21:29:51 +0200
From: Till Kamppeter <till.kamppeter@gmail.com>
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Subject: Re: [Printing-architecture] Two more PDF CUPS filters: pstopdf and
 cpdftocps ("PostScript driver")
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To: Michael Sweet <mike@easysw.com>
Cc: OTANI Koji <sho@bbr.jp>, Tobias Hoffmann <th55@gmx.de>, Printing-japan <printing-japan@lists.linux-foundation.org>, "printing-architecture@lists.linux-foundation.org" <printing-architecture@lists.linux-foundation.org>, Hin-Tak Leung <hintak_leung@yahoo.co.uk>

Michael Sweet wrote:
> Till Kamppeter wrote:
>> Michael Sweet wrote:
>>> As for getting options from the PostScript data stream, today we
>>> can embed page size and duplex mode in the PDF document.  Supporting
>>> other embedded features is not feasible, although applications can
>>> use the CUPS PS job ticket comments at the top of the file:
>>>
>>>     %!PS-Adobe-3.0
>>>     %cupsJobTicket: option=value ... option=value
>>>     %cupsJobTicket: option=value ... option=value
>>>     %cupsJobTicket: option=value ... option=value
>>>     ... other PS comments
>>>     %%EndComments
>>>
>>
>> What does CUPS exactly do when it encounters these %cupsJobTicket: 
>> comments?
> 
> It adds them as job template attributes (options) for the job.
> 
>  > Which part of CUPS is handling them?
> 
> The scheduler (cupsd) scans application/postscript files for these
> comments.
> 
>  > How can one benefit from
>> them in a PDF printing workflow (PostScript -> PDF -> pdftopdf -> 
>> pdftoraster ...)?
> 
> We could update cupsd to do the same scan for application/pdf;
> PDF supports comments just like PostScript.
>

Good idea, please do it.

>  > Do they have to be in the beginning of the PS file or
>> can they be anywhere?
> 
> They have to be in the initial comment block, after the "%!PS-Adobe"
> line.  The scheduler stops on the first line that does not begin
> with a "%".
> 

Thank you for the info. Did not find anything about that in the 
documentation.

    Till