[okular] [Bug 493163] New: Wrong rendering of some PDF files.

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=493163

            Bug ID: 493163
           Summary: Wrong rendering of some PDF files.
    Classification: Applications
           Product: okular
           Version: unspecified
          Platform: Mint (Ubuntu based)
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: njuanchi at gmail.com
  Target Milestone: ---

SUMMARY
Some PDF files are rendered "incorrectly" or rather on a very difficult way for
us to read them.

STEPS TO REPRODUCE
1. Open a PDF file with these characteristics.
2. See how it is pretty much unreadable.
3. See comparisons here:
Default PDF viewer from Linux Mint:
https://images2.imgbox.com/bd/8b/qFzQQ3cP_o.png
Okular: https://images2.imgbox.com/35/e0/SiEpq6OO_o.png
Default PDF viewer: https://images2.imgbox.com/6d/44/0Cf4ul3p_o.png
Okular: https://images2.imgbox.com/70/bc/uM6JJmUR_o.png

OBSERVED RESULT
PDF's are rendered incorrectly.

EXPECTED RESULT
Correct rendering so as to be able to read them.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Linux Mint 20.3 Cinnamon.
KDE Plasma Version: -.
KDE Frameworks Version: 5.68.0. 
Qt Version: 5.12.8.
xcb window system.

ADDITIONAL INFORMATION
Wrong rendered files are provided for reference and testing if needed:
aHR0cHM6Ly9tZWdhLm56L2ZpbGUvTmlGV0FBSWEjU09xZTgtdmJUSm02YWVETkQyMU1GU3pHcWdabnl1R2tuS2xyX0JsbVA5MA==
aHR0cHM6Ly9tZWdhLm56L2ZpbGUva2lrMjFTWUEjd2xYUFlRQXNQYjdwckN1Umdvdk9jVUt1NE1FMFdPUmx2NUdPUlkyOWh2aw==
(base64).

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