[dolphin] [Bug 484734] New: Images with bit depths higher than 8 do not have previews

[TheFeelTrain]

https://bugs.kde.org/show_bug.cgi?id=484734

            Bug ID: 484734
           Summary: Images with bit depths higher than 8 do not have
                    previews
    Classification: Applications
           Product: dolphin
           Version: 24.02.1
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: thefeeltrain at thefeeltrain.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 167928
  --> https://bugs.kde.org/attachment.cgi?id=167928&action=edit
An 8-bit and 16-bit PNG side-by-side

SUMMARY

Image files with bit depths higher than 8 do not have previews/thumbnails
regardless of settings. 
See the attached screenshot for a 16-bit screenshot from mpv and its converted
8-bit counterpart next to it.



STEPS TO REPRODUCE

1. Create a 16-bit color image. mpv with screenshot-high-bit-depth=yes can
create one or you can convert an existing image with imagemagick:

convert image.png -depth 16 output.png

OBSERVED RESULT

Preview is not displayed.

EXPECTED RESULT

Preview is displayed.

SOFTWARE/OS VERSIONS

Operating System: Arch Linux 
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.8.1-3-zen (64-bit)
Graphics Platform: Wayland
Processors: 32 × AMD Ryzen 9 7950X 16-Core Processor
Memory: 30.5 GiB of RAM
Graphics Processor: AMD Radeon RX 6800 XT
Manufacturer: ASUS

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