[dolphin] [Bug 436364] New: Quality of image thumbnails in Desktop is unnecessarily poor

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=436364

            Bug ID: 436364
           Summary: Quality of image thumbnails in Desktop is
                    unnecessarily poor
           Product: dolphin
           Version: 20.12.3
          Platform: openSUSE RPMs
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: view-engine: icons mode
          Assignee: dolphin-bugs-null at kde.org
          Reporter: php4fan at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 138005
  --> https://bugs.kde.org/attachment.cgi?id=138005&action=edit
screenshot of some icons in the desktop

SUMMARY

When I save or copy some image files to the Desktop, the thumbnails that are
displayed have very poor quality.

I attach a screenshot. All the actual images in the screenshot are about 4-5
times the size of the thumbnail, so the thumbnails are scaled down.

I can scale down the images to the same size as the thumbnails in GIMP and they
don't look nearly as bad, so there's no reason why the quality should be so
poor.

They look much better when you browser a folder in Dolphin instead of looking
at the desktop.

I'm assuming the desktop is rendered by Dolphin, apologies if that's not the
case.


STEPS TO REPRODUCE
1. Download some high-quality jpeg image of more than 550x350 pixels in size
2. save or copy it to the desktop
3. look at the desktop

OBSERVED RESULT

The quality of the thumbnail is very bad

EXPECTED RESULT

The quality of the thumbnail should be as high as reasonably possible without
impacting performance.


Operating System: openSUSE Tumbleweed 20210414
KDE Plasma Version: 5.21.4
KDE Frameworks Version: 5.81.0
Qt Version: 5.15.2
Kernel Version: 5.11.12-1-default
OS Type: 64-bit
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-1065G7 CPU @ 1.30GHz
Memory: 7.3 GiB of RAM
Graphics Processor: Mesa DRI Intel® Iris® Plus Graphics

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