[Openicc] Printing Plans GhostScript

[Kai-Uwe Behrmann]

Am 01.03.11, 10:57 -0800 schrieb Hal V. Engel:
> On Tuesday, March 01, 2011 10:47:28 AM Michael Vrhel wrote:
>> Hi Kai-Uwe,
>>
>> You are free to have the profiles be where ever you want them.  That would
>> be an implementation for how you wanted to invoke ghostscript.  If you want
>> to wrap the PDF in some manner with a set of profiles that is fine.  In the
>> end, ghostscript needs to have the PDF stream and the profiles through its
>> interface.

In some situations we can not easily provide any additional profile than 
what is inside the PDF itself.

>> So you say that it is not robust to have the profiles be the same to avoid
>> conversion.  It would be possible to include a command line option to avoid
>> any color conversion for Device based colors that are native to the target
>> device.    For those that are not native some type of color conversion has
>> to occur.  Is this what you would like to see?
>
> Yes we need an explicit way to tell it to pass things directly to the printer.
> It is clear that anything else will have issues.

To add, this explicite expression should reside inside the PDF. Device 
based colors + OutputIntent would be the prefered signal to the 
rasteriser.

Either the pdftoraster filter will be enabled by Ghostscript to analyse 
the PDF and can find out if no conversion shall occure. Or Ghostscript 
could itself ignore a external provided device profile in that case. 
Thats needed so a canned profile parsed by CUPS in the PPD could trigger a 
unwanted conversion.

With this option inside the PDF itself, we would cover basically all PDF 
colour management needs in one way.
Remote colour management for local and remotely configured device profiles 
would become possible because CUPS has to transportation the PDF in any 
case.

>> We are adding in the proper required support for the output rendering
>> intent right now.  It will probably be in the trunk within the next month.

Great

>> Kind Regards,
>>
>> Michael


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