Hi,
Jeremias, thanks for your reply.
I've done a bit more experimenting. Following up on the comment from
the Adobe forum I found a solution to shifting PNG colors with Acroread
at:
http://bmeps.sourceforge.net/examples.html
Adding:
/Group << /S /Transparency /I true /CS /DeviceRGB>>
to the /Type /Page object for each page gets rid of the color shifts.
Is there a way I can get Fop to insert this automatically?
Here are a few additional comments:
Problem occurs with PNGs, indexed PNGs, JPGs, and less frequently with
SVGs.
Problem occurs with both Linux and Windows XP Adobe Reader 9.1. The
color shifts are more pronounced on Linux (on Windows one might just
attribute it to an uncalibrated monitor if one didn't compare directly
the corrected, uncorrected PDFs, and original artwork).
The meanings of the PDF variables can be found starting on page 556 of
the Adobe PDF Reference, Sixth Edition, version 1.7 available at:
http://www.adobe.com/devnet/pdf/
S: Group subtype.
I: Group transparency is isolated.
CS: Group color space.
That's as far as I got trying to understand the PDF spec.
Tav
On Fri, 2009-09-25 at 18:10 +0200, Jeremias Maerki wrote:
> You've probably hit bug #45809 which we still don't know how to fix.
>
> https://issues.apache.org/bugzilla/show_bug.cgi?id=45809
>
> On 25.09.2009 15:51:53 Tavmjong Bah wrote:
> >
> > Hi,
> >
> > I am having problems with colors coming out too dark when I insert PNGs
> > (or JPGs) into a PDF document that is then displayed by Acroread on
> > Linux. Evince gets the colors correct. I've searched the web and found
> > these hints:
> >
> > PDF using DeviceCMYK instead of DeviceRGB:
> > http://forums.adobe.com/thread/395247
> >
> > Converting to index color yields correct color:
> > http://texblog.net/latex-archive/graphics/adobe-reader-wrong-color/
> >
> > XMLGraphicsCommons Bug 47561: png color profiles seem to get lost...
> > https://issues.apache.org/bugzilla/show_bug.cgi?id=47561
> >
> > None of these seems to be the exact problem I have.
> >
> > I've prepared two simple PDF files using DocBook and Fop. The first
> > embeds an indexed PNG. This gives the correct color (the un-indexed one
> > gives the wrong color). I then add a second un-indexed PNG that is
> > forced to be on the next page. The indexed PNG on the first page is now
> > displayed too dark.
> >
> > This is all processed with Fop trunk.
> >
> > I've attached the two PDF files, the two PNG's, and the DocBook file.
> >
> > Any help would be greatly appreciated.
> >
> > Tav
> >
> >
>
>
>
>
> Jeremias Maerki
>
>
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