[Poppler-bugs] [Bug 46880] New: Bitmap aliasing and coordinates inaccuracies

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=46880

             Bug #: 46880
           Summary: Bitmap aliasing and coordinates inaccuracies
    Classification: Unclassified
           Product: poppler
           Version: unspecified
          Platform: Other
        OS/Version: Mac OS X (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
        AssignedTo: poppler-bugs at lists.freedesktop.org
        ReportedBy: chocolate.camera at gmail.com


Created attachment 57904
  --> https://bugs.freedesktop.org/attachment.cgi?id=57904
PDF with bitmap aliasing and object placement inaccuracies.

(Note: I only know how to install Macports version, today 0.18.2; I do not know
if this happens in a later version)

The following PDF has two problems when rendered with `pdftoppm`:

    pdftoppm -r 159 -f 27 -l 27 -tiff sample.pdf > output.tiff

1. Either the rendered bitmaps have aliasing problems or the output has some
horizontal lines missing.

2. The placement of one bitmap layer (top black ink) with respect to the other
one (bottom color) is inaccurate. As a result color seems displaced.

See embedded "output(pdftoppm).jpg" pointing out areas where this happens.

Rendering with `pdftocairo` provides no bitmap antialias whatsoever (which I
would consider a bug too), so it makes it difficult to see whether the two bugs
above happen or not too.

None of these issues happen when rendering with Acrobat X (i.e. Acrobat renders
this PDF flawlessly).

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