[Poppler-bugs] [Bug 9860] low resolution graphic appears smoothed

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=9860


Tom Davidson <tjd at mit.edu> changed:

           What    |Removed                     |Added
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                 CC|                            |tjd at mit.edu




--- Comment #3 from Tom Davidson <tjd at mit.edu>  2008-08-12 21:40:38 PST ---
Smoothing of low-res graphics is not always a bug. In the PDF spec (at least in
version 1.7), there is a flag (called 'Interpolate') for each image which is
supposed to control smoothing. It defaults to 'false', for no interpolation. 

On Fedora 8, (poppler 0.6.2.2, cairo 1.5.8, evince 2.20.2), this flag is
ignored by evince, which renders all images as smoothed. Acroread (8.1.2_SU1)
gets it right. 

I'm attaching 3 pdf files and screenshots showing acroread and evince with the
3 files open. 

-pixels.Imissing.pdf: Interpolate not specified (should be blocky)
-pixels.Itrue.pdf:    Interpolate=true (should be smoothed)
-pixels.Ifalse.pdf:   Interpolate=false (should be blocky)

-acroread_interp_examples.png (Acroread gets it right)
-evince_interp_examples.png (evince renders all as smoothed)


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