https://bugs.kde.org/show_bug.cgi?id=411711
Bug ID: 411711
Summary: Curve Module : Drops do not behave correctly
Product: digikam
Version: 6.3.0
Platform: MS Windows
OS: MS Windows
Status: REPORTED
Severity: normal
Priority: NOR
Component: Plugin-Editor-Curves
Assignee: digikam-bugs-n...@kde.org
Reporter: alexandre.b...@live.fr
Target Milestone: ---
SUMMARY
Using the drops to calibrate the curve leads to greyish picture.
STEPS TO REPRODUCE
1. Open a JPG in the editor (use attached pattern for instance)
2. Selet the "curve" tool
3. Select the black drop
4. Click on a black area
5. Select the white drop
6. Click on a white area
OBSERVED RESULT
The blackest point is moved up to a greyish value ; the white point is moved
down to a greyish value.
The histogramm is compressed in a central area , close to middle values.
EXPECTED RESULT
I would expect the black drop to define luminance = 0 ; white drop to define
luminance =255 (wide histogram).
Note that I expect global luminance adjustment (black;gamma;white) correction,
not individual channel adjustment (RGB) that would lead to white balance
drifts.
SOFTWARE/OS VERSIONS
Windows: 10
ADDITIONAL INFORMATION
Please tell me if I can download & test 6.4.0 weekly build.
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