https://bugs.kde.org/show_bug.cgi?id=459822
Bug ID: 459822
Summary: Blending raw images (-2,0,+2 Ev) does not result in
exposure blend. (all three TIFFs are corrected for 0Ev
before merging.)
Classification: Applications
Product: digikam
Version: 7.8.0
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Plugin-Generic-ExpoBlending
Assignee: digikam-bugs-n...@kde.org
Reporter: newmi...@gmail.com
Target Milestone: ---
SUMMARY
***
When merging/blending a series of bracketed exposures (-2,0 and +2Ev) in Pentax
PEF format, the align_image_stack step creates three near identical files in
/tmp (aligned0000.tif, aligned0001.tif and aligned0002.tif) after the
align_image_stack step but before the merge dialog. The final merged file ends
up exactly identical to the original 0Ev exposure.
I shoot RAW+ so I did the merge on the associated JPEG files (like the PEF
raws, straight out of the camera) and there the results are as expected. The
/tmp sligned images clearly show correct-, under- and overexposed versions and
the final merged tiff file clearly show the blended version.
***
STEPS TO REPRODUCE
1. Select 3 handheld PEF (presumably/maybe all raw formats) and start the blend
process
2. Accept the location for enfuse and align_image_stack
3. Wait until the dialog indicates alignment step is complete
4. Check intermediate aligned000x.tif files in /tmp
OBSERVED RESULT
Exposure blending raw files causes align_image_stack to convert raw to
auto-exposed aligned tiffs before merging (by...libraw?) negating the expected
result of a merged (HDR-based) end image.
EXPECTED RESULT
An exposure blended version where the best exposed parts of multiple exposures
in a bracketed series are blended into the final result.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro with kernel 5.19.7-1-MANJARO 64 bits
(available in About System)
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.97.0
Qt Version: 5.15.5
ADDITIONAL INFORMATION
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