[Poppler-bugs] [Bug 73901] New: pdftocairo sets image background to black instead of white/transparent

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73901

          Priority: medium
            Bug ID: 73901
          Assignee: poppler-bugs at lists.freedesktop.org
           Summary: pdftocairo sets image background to black instead of
                    white/transparent
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: korobkin+lpad at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: cairo backend
           Product: poppler

Created attachment 92547
  --> https://bugs.freedesktop.org/attachment.cgi?id=92547&action=edit
transparent.pdf

There is a semi-transparent image in the attached PDF "transparent.pdf". 

When converted with pdftocairo 0.24.5 based on cairo 1.12.16 with all the
recent patches from master branch, pdftocairo -ps -level3 transparent.pdf
transparent-cairo.ps, we get unexpected black background on that image. 

When converted with pdftops 0.24.5, pdftops -level3 transparent.pdf
transparent-ps.ps, background is rendered properly, white. 


transparent.pdf, transparent-cairo.ps, and transparent-ps.ps are attached.

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