[Poppler-bugs] [Bug 74202] New: Transparency doesn't display correctly in PDF from adobe illustrator

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74202

          Priority: medium
            Bug ID: 74202
          Assignee: poppler-bugs at lists.freedesktop.org
           Summary: Transparency doesn't display correctly in PDF from
                    adobe illustrator
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: gpoo at gnome.org
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: general
           Product: poppler

Created attachment 93018
  --> https://bugs.freedesktop.org/attachment.cgi?id=93018&action=edit
PDF test case that it is rendered properly

This was reported in https://bugzilla.gnome.org/show_bug.cgi?id=723261

------------------------------------------
I created a simple pdf with alpha transparency and it looks fine in evince.
However, I need to interact with adobe illustrator for work. When AI opens the
pdf and saves it again, and then I load that pdf that was generated by AI in
evince, then the transparency is broken. Everything looks opaque instead of
transparent.

However, I can open the pdf that is generated by AI in Foxit Reader (on a
computer running windows) and it looks fine. Another workaround is if I save
from AI as PDF1.3 instead of PDF1.7 then it works, but I would rather not have
to do this.

I am using Linux Mint 16 and the version of evince from the package manager
(3.6.1 using cairo/poppler 0.24.1). I can provide more system details upon
request.

I have attached the original file (transparency.pdf) which looks fine. And I
have attached the file that is produced by AI (transparency_fromai.pdf) which
looks wrong in evince.

I realize this is probably more of a bug in AI than it is in evince, but I
would appreciate any suggestions for how I can open these PDF1.7 files in
evince and view the transparency.
------------------------------------------

The problem is reproducible with poppler-glib and poppler-qt4-demo using the
Arthur backend.  The Splash backend renders the document correctly, as well as
acroread.

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