[poppler] Color Management

[Hal V. Engel]

On Thursday 07 August 2008 06:58:13 pm Leonard Rosenthol wrote:
> Correct.  You'd need to make MAJOR changes to the rendering
> architecture of Poppler to do proper color management - especially
> where transparency is involved.
>
> But it would be a very good thing...
>
> Leonard

Isn't the use of ICC Profiles in PDFs an integral part of the PDF 
specification?  

If I have an image with a BetaRGB profile embedded into the image (this has a 
wide gamut and unless color managed will not be displayed correctly) as part 
of a PDF how does poppler transform that image to the monitor color space? 

I notice in GfxState that there is logic for deciding if an object uses an ICC 
based color space (IE. virtual GfxColorSpaceMode getMode() { return 
csICCBased; }).   If there is no color management support what is being done 
with this information?

Yes it would be a very good thing if poppler had proper color management.  In 
fact I don't understand how any PDF library can bet by without it.   These 
things are not that hard to do if they are done as part of the initial design 
but are generally difficult to retro fit after the fact.

Ok what color space does poppler use for it's output when rendering to a 
monitor (I don't mean RGB I mean what ICC profile describes the color space 
used for this).  Maybe I can take care of this at the applcation level if 
popple renders to a known color space.

Hal

>
> On Aug 7, 2008, at 1:33 PM, Albert Astals Cid wrote:
> > A Dijous 07 Agost 2008, Hal V. Engel va escriure:
> >> I am looking at adding color managed display of PDF files to an
> >> application
> >> that is using poppler.  But I have not found much in the way of
> >> documentation for the poppler API.  Is there documentation on how
> >> to setup
> >> poppler so that it will use monitor ICC profiles to correctly
> >> display PDF
> >> documents?  If not is there a piece of code that does this that
> >> someone can
> >> point out to me?
> >
> > As far as i know we don't support color management at all.
> >
> > Albert
> >
> >> Hal
> >
> > _______________________________________________
> > poppler mailing list
> > poppler at lists.freedesktop.org
> > http://lists.freedesktop.org/mailman/listinfo/poppler

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