https://bugs.kde.org/show_bug.cgi?id=402554
Bug ID: 402554
Summary: Gwenview upscales image on high-DPI monitors when
scaling factor (in display settings) is set to >1
Product: gwenview
Version: 18.08.3
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: gwenview-bugs-n...@kde.org
Reporter: tamius....@gmail.com
Target Milestone: ---
SUMMARY
On high-DPI monitors where scaling factor is set to more than one, gwenview
seems to upscale the image by scaling factor. Image appears pixelizated. Issue
is demonstrated in the screenshot.
STEPS TO REPRODUCE
1. Set scaling factor in settings > display settings to more than one (I use
1.3)
2. Open any image in gwenview
OBSERVED RESULT
Image is pixelizated, with jagged edges everywhere and generally looks pretty
atrocious. (Right side of the screenshot/Gwenview window)
EXPECTED RESULT
Image is displayed normally, with no scaling applied (Left side of the
screenshot/GIMP)
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 4.19.8-2-MANJARO
KDE Plasma Version: 5.14.4
KDE Frameworks Version: 5.52.0
Qt Version: 5.11.2
ADDITIONAL INFORMATION
Judging by the image quality, it appears that gwenview rescales image twice. It
seems the following happens:
1. Gwenview calculates how big the window would be if the scaling factor was
set to 1
2. Gwenview rescales the image to fit inside a window of dimensions calculated
in step 1
3. Gwenview then upscales the image to fit inside the actual window, using
nearest neighbour (upscaling the image from step 2)
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