[Openicc] Google Summer of Code 2011: The Common Printing Dialog and Color Management

[Kai-Uwe Behrmann]

Am 17.05.11, 22:20 +1000 schrieb Graeme Gill:
> Kai-Uwe Behrmann wrote:
>> How do you think PPD and CPD or Gutenprint can interact with the SCPS tag?
>
> Normally it wouldn't. It would normally be generated by Color Profiling
> software, or manually added to pre-defined targets. To facilitate
> pre-matching, it would have to be added to applications that
> do their own color management and want pre-matching.
>
>> So you expect the tag to be preserved after the PDF rasterisation?
>
> It depends on the print spooling workflow. A print workflow or application
> that allows direct submission would work by definition, but I have no
> idea whether that is the case with any existing print systems (the
> ColorBus RIP allowed direct submission of TIFF and PS files to the Windows
> NT base spooler for speed.). If all files are re-interpreted, then the print
> system would have to preserve the tag.

Ah, good.

>> Then
>> pdftoraster would be somehow involved. I would like to read more
>> descriptions about the intented stage in the process and implementation
>> details. That could greatly help.
>
> I'm not sure what you are after. The intent is that the printer driver/RIP
> (or whatever handles the color management) should honour the tag as a
> "this is in device space" type tag, + extras in terms of the printer
> processing. There are details missing in the big picture, such as a means
> of a color management/calibration system knowing what printing stages the
> printer actually uses, what logical & native colorspaces it supports etc.

Well from you above statements I understand, you suggested the SCPS 
information to pass directly to the print driver without involving any 
prior options handling.

>> [Gutenprint has annouced support for the ColorKeyWord colour tagging of
>> options. That information would cover all options of State 1 - 4.]
>
> I'm not aware of the details.

The ColorKeyWords is described here:
http://www.freedesktop.org/wiki/OpenIcc#PPDcolouring

kind regards
Kai-Uwe Behrmann
-- 
developing for colour management 
www.behrmann.name + www.oyranos.org