[Poppler-bugs] [Bug 97599] New: Logo image looks different in Evince compared to other viewers

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97599

            Bug ID: 97599
           Summary: Logo image looks different in Evince compared to other
                    viewers
           Product: poppler
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: cairo backend
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: t.kuchta at imperial.ac.uk

= Transfering this bug from GNOME Bugzilla:
https://bugzilla.gnome.org/show_bug.cgi?id=770429 =

 - Copy Evince bugzilla comments here -

Tomasz Kuchta 2016-08-26 08:25:50 UTC
Created attachment 334209 [details]
test file

File 109865.pdf is displayed slightly different by Evince, compared to other
viewers. The top-left logo is brighter, with horizontal lines going across it.
I have tested that on Ubuntu 15.10, with Evince 3.16.1.


The file is "109865.pdf", from Govdocs1 data set
(http://digitalcorpora.org/corpora/govdocs)

The file can be found in the following archive:
http://digitalcorpora.org/corp/files/govdocs1/zipfiles/109.zip

I would be grateful for confirming.

 backtrace
Comment 1 Germán Poo-Caamaño 2016-08-26 16:55:09 UTC
Created attachment 334232 [details]
Evince 3.21/Poppler 0.46.0 side by side with Acrobat Reader

This is a screenshot side by side of Evince and Acrobat Reader rendering the
same document.

I do not see major difference.

Beware that Ubuntu 15.10 ships poppler 0.33. Poppler is the library used by
Evince to render PDF. Since 0.33 there have been many bugs fixed.

Please, try with a newer version of poppler and let us know if you can
reproduce it the issue then.
Comment 2 Jason Crain 2016-09-04 02:23:34 UTC
Created attachment 334738 [details]
from pdftocairo 0.47.0

I see some odd horizontal banding, but it's only visible on higher zoom levels.
 Attached is the output from pdftocairo version 0.47.0, at 200x200 ppi.  Since
this looks like a bug in poppler, please follow the instructions at
https://wiki.gnome.org/Apps/Evince/PopplerBugs#poppler and open a bug for
poppler's cairo backend.

 - Copy in any links to attachments here -

https://bugzilla.gnome.org/attachment.cgi?id=334209

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