[Openicc] Printing Plans GhostScript / sRGB / ICC

[Jan-Peter Homann]

Hello Chris and all,
I think having metadata in the spool file for transporting informations, 
which are not part of the PDF but needed for pdftoraster are quite useful.

E.g., if I want to print in draft mode and do screening in gutenprint, 
it would be enough to render a bitmap with 360 DpI in GhostScript. Other 
usescases would be e.g. 720 DpI and highest quality 1440 DpI.

Such information have not a standard place in the PDF, but they are 
useful as an flag like "don´t colormanage"
Also when the user specifies "Duplex Printing", such Metainformation is 
specified in the moment when the spool file is created and must be 
passes through pdftoraster reach the driver (e.g. Gutenprint).

So have a look how CUPS is handling such metada / jobticket and define 
here the flag "don´t colormanage"

Best regards
Jan-Peter



Am 02.03.11 19:36, schrieb Chris Murphy:
>
> On Mar 2, 2011, at 11:18 AM, Jan-Peter Homann wrote:
>>
>> The discussion on how to handle printing DeviceXXX spool data without applied "sRGB to printer profile transformtion" is in my eyes a little bit strange.
>>
>> We only have to take care, that the pdftoraster filter can be easily configured to print straight forward. What should not be complicated both for GhostScript and poppler.
>>
>> If we are able to transport printer specific options like e.g. duplex options beside the PDF spool file, we should also be able to transport a flag for turning colormanagement of in pdftoraster filter beside the PDF spool file. I don´t see any need to integrate a "color management of flag" directly into DeviceXXX PDF files.
>
> How do you communicate to pdftoraster when /DeviceRGB means sRGB vs actually meaning /DeviceRGB?
>
> For a PDF spool file, you can do this with /DeviceRGB without OutputIntent, vs /DeviceRGB with OutputIntent.
>
> For PostScript you don't have OutputIntent, so how do you differentiate for PostScript?
>
>
> Chris Murphy
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