[poppler] lcms usage in poppler

Thomas Freitag thomas.freitag.bbr at gmail.com
Sun Aug 4 03:34:42 PDT 2013

Am 02.08.2013 19:50, schrieb Albert Astals Cid:
> El Divendres, 2 d'agost de 2013, a les 17:05:38, Thomas Freitag va escriure:
>> Hi Folks!
>> Can anybody tell me how I can really test the lcms integration in
>> poppler? I thought it should work, but now I'm no more sure. Reason for
>> the change of my mind is that I tried to implement the usage of
>> OutputIntents.
> Is your implementation similar to the one i did 2 years ago?
> https://bugs.freedesktop.org/show_bug.cgi?id=34053  
Thanks for the hint, Albert. In the meantime I already encountered, that 
creating the transformation with INTENT_PERCEPTUAL instead of 
INTENT_RELATIVE_COLORIMETRIC works fine with the GWG tests (This time I 
attach only one result, but the two other are also okay). Now I'd read 
the bug comments, but I did't find any intent entries in the PDF. BUT: 
as far as I understand the PDF spec, the settings in output profile 
should be used if there are no intent entries, and indeed, the profile 
pointed by the OutputIntents dictionary says:

icc:RenderingIntent               : Perceptual

Should I try fix it in that way and and attach a patch to bug 34053?

> I could not find either why it was not working.
> Maybe you can mix your idea and my idea and get something that works?
> Cheers,
>    Albert
>> Motivation is the GWG, patch series 7 (07_OutputIntent),
>> but the result of my first tests is not really satisfying, s.
>> attachments. Of course it's a little bit better than without my
>> implementation, see i.e. the shading cross. But it's not like it should
>> be. So I'm wondering now if the reason for it
>> 1. is my wrong implementation (but in the debugger I saw that the lcms
>> transformation is called) or
>> 2. is the integration of lcms in poppler, at least in the CMYK area (I
>> need to test it there, because the profiles in the PDF are CMYK profiles) or
>> 3. is lcms with this kind of profiles (the profiles are REALLY small for
>> CMYK profiles, normally I see CMYK profiles with a size of at least 512
>> kByte).
>> Cheers,
>> Thomas
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