Bug 485009

Summary: Exposure times greater or equal to 1 second are shown as a fraction in EXIF metadata view.
Product: [Applications] digikam Reporter: zeitler.georg
Component: Metadata-ExifAssignee: Digikam Developers <digikam-bugs-null>
Status: RESOLVED FIXED    
Severity: normal CC: metzpinguin
Priority: NOR    
Version First Reported In: 8.3.0   
Target Milestone: ---   
Platform: Microsoft Windows   
OS: Microsoft Windows   
Latest Commit: https://invent.kde.org/graphics/digikam/-/commit/9808e33bd3ebbcda50ca18c73ea38c14749c846b Version Fixed/Implemented In: 8.4.0
Sentry Crash Report:
Attachments: incorrect display as a fraction
correct display in seconds

Description zeitler.georg 2024-04-04 04:20:27 UTC 
Created attachment 168123 [details]
incorrect display as a fraction

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SUMMARY
After editing EXIF metadata, exposure times are shown as fraction "(x/1)" in EXIF metadata view if exposure times are larger than 1 second.

STEPS TO REPRODUCE
1.  Import unedited .jpg from Canon EOS 6D camera with an exposure time greater or equal to 1 second. In EXIF metadata view, the exposure time is correctly displayed in seconds, e.g. "x s".
2.  Edit any EXIF metadata field in digikam.
3.  Observe that now, the same exposure time in EXIF is shown as a fraction in brackets "(x/1).

OBSERVED RESULT
Exposure time is shown as a fraction "(x/1)".

EXPECTED RESULT
Exposure time is shown as "x s".


SOFTWARE/OS VERSIONS
Windows: Windows 10 Pro
macOS: 
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
Comment 1 zeitler.georg 2024-04-04 04:21:06 UTC 
Created attachment 168124 [details]
correct display in seconds
Comment 2 Maik Qualmann 2024-04-04 06:13:44 UTC 
The behavior is reproducible when Exiv2 is used as the metadata writing engine. The behavior does not occur with activated ExifTool for writing.

Maik
Comment 3 Maik Qualmann 2024-04-04 06:20:48 UTC 
The behavior can only be reproduced with the metadata editor because we set the exposure time tag as a rational value.
ExifTool corrects it automatically.

Maik
Comment 4 zeitler.georg 2024-04-04 18:48:08 UTC 
(In reply to Maik Qualmann from comment #3)
> The behavior can only be reproduced with the metadata editor because we set
> the exposure time tag as a rational value.
> ExifTool corrects it automatically.
> 
> Maik

I can confirm that switching to exiftool for writing the metadata solves the problem. Thanks!
Georg
Comment 5 Maik Qualmann 2024-04-05 21:06:21 UTC 
Git commit 9808e33bd3ebbcda50ca18c73ea38c14749c846b by Maik Qualmann.
Committed on 05/04/2024 at 21:04.
Pushed by mqualmann into branch 'master'.

some Exif tags have to be written as unsigned rational values
FIXED-IN: 8.4.0

M  +1    -1    NEWS
M  +3    -3    core/dplugins/generic/metadata/metadataedit/exif/exifdevice.cpp
M  +3    -3    core/dplugins/generic/metadata/metadataedit/exif/exiflens.cpp
M  +4    -4    core/libs/metadataengine/dmetadata/dmetadata_libraw.cpp
M  +7    -0    core/libs/metadataengine/engine/metaengine.h
M  +22   -0    core/libs/metadataengine/engine/metaengine_exif.cpp

https://invent.kde.org/graphics/digikam/-/commit/9808e33bd3ebbcda50ca18c73ea38c14749c846b