[okular] [Bug 448462] New: PDF images may display repeated rectangular artefacts in the background at certain zooms

[rgreen]

https://bugs.kde.org/show_bug.cgi?id=448462

            Bug ID: 448462
           Summary: PDF images may display repeated rectangular artefacts
                    in the background at certain zooms
           Product: okular
           Version: 21.12.0
          Platform: Mint (Ubuntu based)
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: printing
          Assignee: okular-devel at kde.org
          Reporter: greenandpleasant2000-support at yahoo.co.uk
  Target Milestone: ---

Created attachment 145458
  --> https://bugs.kde.org/attachment.cgi?id=145458&action=edit
PDF showing visual artefacts at certain zoom settings

SUMMARY
***
At certain zoom levels pdf images may display repeating rectangual markings
whose size is related to the zoom level.. 
***
STEPS TO REPRODUCE
1. Open the attached pdf ("artefact"). This is actually an image, although text
is displayed.
2. Set zoom level to 100%, then 110%.
3. Now, set zoom to 120%, then 125%.

OBSERVED RESULT

The view is as expected up to 110%. However, at 120%, you can definately make
out repeating, bluish, rectangles in the background. These become very much
smaller at 125%, and gradually fade away at incrementally larger zooms up to
150% or so.

EXPECTED RESULT

Obviously, there should be no such visual artefacts at any zoom.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma:  Linux Mint
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 5.89
Qt Version: 5.15.3

ADDITIONAL INFORMATION

No artefacts were visible when viewing the same document at similar zooms in
Xreader.

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