[poppler] lcms usage in poppler
Albert Astals Cid
aacid at kde.org
Mon Aug 5 10:29:18 PDT 2013
El Dilluns, 5 d'agost de 2013, a les 10:23:20, Thomas Freitag va escriure:
> Thanks, Leonard!
> That clearifies it, and also makes the remarks of Olaf clearer: the GWG
> patches use the "ri" stream operator which I missed just looking into
> the PDF objects, and of course the tests set it to "Perceptual", but
> this was only implemented in the patch of Albert for bug 34053 (sorry,
> Albert, I should have taken a deeper look into that patch first).
> I think, I'm now able to create a correct patch to render the GWG files
> correctly, and I'll have also a look into the altona file.
> @Albert: Should we now continue the discussion now on bug 34053? I
> think, I've now all informations necessary, and what You're missing in
> Your patch at that bug is the usage of OutputIntents and probably that
> You'll see only differences if You render the altona file in CMYK mode!
Keeping the discussion in the bug works for me.
> Am 04.08.2013 15:00, schrieb Leonard Rosenthol:
> > On 8/4/13 8:35 AM, "Thomas Freitag" <thomas.freitag.bbr at gmail.com> wrote:
> >> 1. The PDF spec says that the default rendering intent is
> >> RelativeColormetric
> > Correct.
> >> 2. The explanation in the 070-072_ReadMe_Ghent_Output_Patch.pdf says
> >> that the crosses should be rendered with Perceptual rendering
> >> But what inside the patch tests says that not the default, but the
> >> Preceptual rendering intent should be used? I haven't found any
> >> rendering intent parameters in the patches.
> > I haven't looked at the patches, so I can't be certain.
> > However, I can say that the RI can be changed from the default in one of
> > three ways.
> > 1 - the 'ri' operator in the content stream
> > 2 - the 'RI' key in an ExtGState dictionary (which is set with the 'gs'
> > operator)
> > 3 - the 'Intent' key on a specific image XObject.
> > Make sure you've looked at all three.
> >> Does GTS_PDFX as subtype and/or the ICC profile ine OutputIntents
> >> directory forces this?
> > NO! However, when acting as a PDF/X compliant viewer, you WOULD use that
> > profile as the source and/or destination profile for rendering instead of
> > some other "working space".
> > Leonard
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