https://bugs.kde.org/show_bug.cgi?id=525736
Bug ID: 525736
Summary: The DNG converter ignores the Sony SR2 data when
converting from ARW to DNG.
Classification: Applications
Product: digikam
Version First unspecified
Reported In:
Platform: Appimage
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Plugin-Bqm-DngConverter
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
DESCRIPTION
The DNG converter ignores the Sony SR2 MakerNotes when converting from ARW to
DNG.
STEPS TO REPRODUCE
1. Open a Sony ARW file.
2. Open batch queue manager and convert the ARW file to DNG without doing any
other operations.
3. Compare `exiftool -a -s -G1` output of the original file and the converted
one.
4. If the Sony ARW has been converted once via Adobe DNG converter (see
"Additional information" below), the resulting file is unusable due to missing
parameters.
OBSERVED RESULT
The "SR2SubIFD" and other Sony metadata are not copied to the resulting DNG
file.
EXPECTED RESULT
All the Sony metadata are copied to the resulting DNG file.
SOFTWARE/OS VERSIONS
Operating System (available in the Info Center app, or by running `kinfo` in a
terminal window): Debian Sid
KDE Plasma Version:
KDE Frameworks Version: 6.28.0
Qt Version: 6.11.2
ADDITIONAL INFORMATION
Adobe's DNG converter has an issue handling Sony SR2 data:
https://community.adobe.com/questions-712/problem-in-dng-converter-while-processing-sony-s-arw-images-1167216
The issue is not fixed and still exists in the latest version of Adobe DNG
converter.
`exiftool` will have a warning about error reading SR2 info. If you try to
convert the file again in DigiKam, the resulting DNG files will have a purple
tint since the black level will be set to 0. Based on the data in original ARW
files, you need to set the black level to 512 and white level to 15360 as a
default (based on my A5100 and A7R4). There is also a "Color Matrix" in SR2
that is different for each model.
If it is possible to recover the values from the broken 0x7250 tag, try using
that as the B/W level and color matrix; otherwise you may need to collect those
values from sample ARW files (they seems to be the same per model).
Also as a "failsafe", try copying all MakerNote fields into a dedicated XMP
namespace in case something goes wrong with MakerNotes.
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