[Openicc] CUPS Color Management under Linux gets into distros

[Hal V. Engel]

On Tuesday, February 08, 2011 12:40:10 PM Till Kamppeter wrote:
> On 02/08/2011 09:33 PM, Alastair M. Robinson wrote:
> > Hi :)
> > 
> > Exciting news to hear about the new CM CUPS filter.
> > 
> > On 08/02/11 20:25, Hal V. Engel wrote:
> >> This appears to be unchanged since 2009. So it appears
> >> that poppler currently always does relative colormetric intent
> >> regardless of what intents
> >> in coded into the PDF file for it's objects. I can live with this for
> >> initial testing of the
> >> workflow but it does need to be fixed before this is considered
> >> production.
> > 
> > It does need fixing properly, but in the meantime, for testing, (and at
> > least for the Natty release) can you get it changed to Perceptual, or at
> > least RelCol + BPC? It'd be a real shame for the first CM-capable
> > distro-provided print system to have a hard-coded intent that will clip
> > shadow detail on most printers.
> 
> Is the rendering intent hard-coded in Poppler or in the pdftoraster
> filter? 

poppler

> Or can the problem be fixed by the pdftoraster filter directly
> communicating with the liblcms stuff?

no

> If it requires changes in Poppler
> we should report a bug in Poppler ASAP and it is a bug of high impact as
> it makes Poppler's color management very restricted.

I reported this to the poppler email list May 2009 so they are aware of this 
but there is nothing about this specific issue in buzilla.  So it does need to 
be reported.  In particular since the fix is not trivial.

> 
> If it is possible to fix it in pdftoraster, then, Otani-san, could you
> fix it?
> 
>     Till
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