[Openicc] PDF srgb Workflow
homann at colormanagement.de
Mon May 16 01:36:21 PDT 2011
In past discussions some people stated, that a colormanagement print
pipeline can´t work with DeviceRGB PDF files and needs instead ICCbased RGB.
From may point of view, the question depends on the possibilities of
the pdftoraster engine. So far as I understand, poppler can´t transform
DeviceRGB objects from sRGB to a printer profile.
But with GhostScript, this can easily eached by activating
ICC-colormanagement for DeviceRGB objects and use the GhostScript
default sRGB profile for this usecase.
As this GhostScript-option doesn´t has side effects for ICC-based
content in PDF print spool files, we can start a color managed printing
path with the print spool files produced by the vast majority aoff
Concerning a poppler based workflow, I recommend to enhance poppler with
this similar feature of GhostScript.
If g-c-m or Oyranos could either adress GhostScript or poppler in a
similar way to provide the printer profile, we are mostly done.
As an addition, handling the rendering intent from sRGB to printer
profile is much more easy, if its specified per printing session, than
if it has to be hardcoded into every single ICCbased PDF objects,
considering also that ICCbased PDF rendering intents can´t transport the
information for blackpoint compensation.
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