[Poppler-bugs] [Bug 28231] New: Distortion in image scaling

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28231

           Summary: Distortion in image scaling
           Product: poppler
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: cairo backend
        AssignedTo: poppler-bugs at lists.freedesktop.org
        ReportedBy: hadmut at danisch.de


Hi,

I found that evince is producing distorted pictures, slight problems when
displaying an image. 

The authors of evince were able to reproduce the problem and asked me to file
the bug against poppler/cairo. 

The description:

I am preparing pictures for a given screen size to fit in exactly
without rescaling, e.g. to fit into a 1024x768 screen. I therefore
generate a PDF document with the same aspect and paste pictures into to
fully expand to either width or height (depending on aspect).

While in principle evince does what I expect, you'll find little
distortions when comparing the picture with what evince displays


E.g. compare the details at the car or the cables in to top right
corner at

http://www.danisch.de/tmp/evincetest.pdf
http://www.danisch.de/tmp/evincetest.jpg

you'll find a visible loss of image quality both on larger screens
where both need to be rescaled as on screen with the exact height
of 768 pixels.

Screendump with distortions (look at the cables or the car):

http://www.danisch.de/tmp/Screenshot.png

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