https://bugs.kde.org/show_bug.cgi?id=489250

            Bug ID: 489250
           Summary: The wallpaper is cropped with poor quality
    Classification: Plasma
           Product: plasmashell
           Version: master
          Platform: Neon
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Image Wallpaper
          Assignee: plasma-b...@kde.org
          Reporter: katze_...@alt-kde.ru
                CC: notm...@gmail.com, qydwhotm...@gmail.com
  Target Milestone: 1.0

Created attachment 171026
  --> https://bugs.kde.org/attachment.cgi?id=171026&action=edit
The wallpaper that I'm installing

SUMMARY
We created our wallpapers in 3000x3000 resolution and set them as desktop
wallpapers through the context menu. They looked clear and everything was fine. 

Our next step was to prepare the wallpaper as a system wallpaper for all users.
We put the wallpaper in "/usr/share/wallpapers/Wallpaper
Name/content/images/3000x3000.png", having previously filled in the metadata
file.json

After preparation, we apply these wallpapers through the system parameters and
suddenly notice that the picture quality has deteriorated. The problem was
solved by reducing the image resolution to 3000x1687, but it seems to me that
this is a bug and this should not be.

STEPS TO REPRODUCE
1. Take a wallpaper of 3000x3000 or higher (attached to this message)
2. Put the wallpaper in "/usr/share/wallpapers/Folder/contents/images" or
"~/.local/share/wallpapers/Folder/contents/images" (you should also configure
metadata.json)
3. Open the system settings and apply the wallpaper.

OBSERVED RESULT
The wallpaper is slightly blurred, losing quality.

EXPECTED RESULT
High-quality wallpapers, as when they are installed through the context menu.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: KDE Neon Unstable
KDE Plasma Version: 6.1.80
KDE Frameworks Version: 6.4.0
Qt Version: 6.7.0
Graphics Platform: Wayland
Screen Resolution: 1920x1080 (the global scale is not used)

ADDITIONAL INFORMATION
This bug is also relevant in KDE Plasma 5.27.11 and 6.1.1. Just below I will
take two screenshots where the difference between wallpapers installed through
the context menu and wallpapers installed in another way will be clearly
visible

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