[Poppler-bugs] [Bug 68986] New: pdftoppm doesn't render eci_altona-test-suite-v2_technical2_x4.pdf correctly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68986

          Priority: medium
            Bug ID: 68986
          Assignee: poppler-bugs at lists.freedesktop.org
           Summary: pdftoppm doesn't render
                    eci_altona-test-suite-v2_technical2_x4.pdf correctly
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: Thomas.Freitag at alfa.de
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: splash backend
           Product: poppler

Created attachment 85262
  --> https://bugs.freedesktop.org/attachment.cgi?id=85262&action=edit
regressions

The altona testsuite 2.0 PDF is not rendered correctly by pdftoppm, the PDF is
available on 
http://www.eci.org/_media/downloads/altona_test_suite/eci_altona-test-suite-v2_technical2_x4.pdf. 
I marked some of the regressions in the attached result (rendered with 36 dpi
only to make it as small as possible).
Patch "D" of the test is solved with the patch of bug 34053, the regressions in
patch "P" seem to be almost an openjpeg bug, s. bug 68438 or 
http://code.google.com/p/openjpeg/issues/detail?id=234.
But the other regression should be all in the area "transparency groups",
"knockout" and/or "blending mode". I'm not sure in the moment if the
regressions have all the same reason or different reasons, but I'll try to
solve them step by step.

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