https://bugs.kde.org/show_bug.cgi?id=466658
Bug ID: 466658
Summary: EXIF metadata is used when available for JPEG
thumbnails, resulting to very low quality or even
broken thumbnails
Classification: Frameworks and Libraries
Product: kio-extras
Version: 22.08.2
Platform: Kubuntu
OS: Linux
Status: REPORTED
Keywords: regression
Severity: normal
Priority: NOR
Component: Thumbnails and previews
Assignee: plasma-b...@kde.org
Reporter: stephane.treb...@gmail.com
Target Milestone: ---
Created attachment 156871
--> https://bugs.kde.org/attachment.cgi?id=156871&action=edit
Provided by the user drinktheocean on
https://forum.endeavouros.com/t/any-way-to-make-dolphin-preview-ignore-jpeg-exif-thumbnails/37091
SUMMARY
Since at least Kubuntu 22.10 and Dolphin 22.08.2 EXIF metadata is used when
available for JPEG thumbnails and the thumbnail creation from the JPEG data is
skipped, resulting into low quality thumbnails.
STEPS TO REPRODUCE
1. Save the image 7n36d9.jpg (attached to this bug report) to any folder.
2. Show the folder in Dolphin 22.08.2 or newer.
OBSERVED RESULT
The image preview shows an orange (the thumbnail embedded inside the EXIF
metadata).
This serves only as an example, in real life cases the thumbnail embedded
inside the EXIF metadata will be correct but low resolution and not adequate
for a preview in a file explorer on a personal computer.
EXPECTED RESULT
The image preview should show an apple (the actual content of the image).
The resolution should be sufficient to use on a high resolution display
commonly used with modern personal computers.
This is mostly not the case with the thumbnail embedded inside the EXIF
metadata.
SOFTWARE/OS VERSIONS
Linux: 5.19.0-31-generic
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
ADDITIONAL INFORMATION
This was recently reported in different forums:
https://forum.manjaro.org/t/bad-quality-thumbnails-in-dolphin/126378
https://forum.endeavouros.com/t/any-way-to-make-dolphin-preview-ignore-jpeg-exif-thumbnails/37091
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