Bug 338142

Summary: Artifact in blur rendering with "Graphics Antialias" enabled
Product: [Applications] okular Reporter: Lucas Kane <box0>
Component: PDF backendAssignee: Okular developers <okular-devel>
Status: RESOLVED UPSTREAM    
Severity: normal CC: aacid, luigi.toscano
Priority: NOR    
Version First Reported In: 0.19.60   
Target Milestone: ---   
Platform: Other   
OS: Linux   
See Also: https://bugs.freedesktop.org/show_bug.cgi?id=82391
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: rendering artifacts with antialias enabled
correct rendering with antialias disabled
original pdf

Description Lucas Kane 2014-08-09 09:01:32 UTC
Created attachment 88175 [details]
rendering artifacts with antialias enabled

When the option "Graphics Antialias" is enabled some PDFs show rendering artifacts. Please see the attached pictures for a comparison.

The artifacts go away if the option is disabled (however that mean poor general rendering quality). 

Other readers not based on poppler are not affected (e.g. muPDF).
Comment 1 Lucas Kane 2014-08-09 09:03:05 UTC
Created attachment 88176 [details]
correct rendering with antialias disabled
Comment 2 Lucas Kane 2014-08-09 09:07:50 UTC
Created attachment 88177 [details]
original pdf
Comment 3 Lucas Kane 2014-08-09 09:09:18 UTC
In case it is not clear, the problem is in the slight darker outline that can be seen at the end of the blurred region. It should be easy to spot the problem if you open the test pdf in okular first and then with mupdf
Comment 4 Albert Astals Cid 2014-08-09 14:48:26 UTC
This is an issue with poppler the rendering library we use for pdf files. Please report the bug upstream at https://bugs.freedesktop.org/

Thanks for caring about okular :)
Comment 5 Lucas Kane 2014-08-09 15:33:52 UTC
upstream bug: https://bugs.freedesktop.org/show_bug.cgi?id=82391