Re: [Printing-architecture] Two more PDF CUPS filters: pstopdf and cpdftocps ("PostScript driver")

[Till Kamppeter <till.kamppeter@gmail.com>]

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