[Digikam-devel] [Bug 290442] New: Unsharp mask with radius less than 1.0 burns images
Tap at people.homeip.net
Tap at people.homeip.net
Mon Jan 2 21:10:37 GMT 2012
https://bugs.kde.org/show_bug.cgi?id=290442
Summary: Unsharp mask with radius less than 1.0 burns images
Product: digikam
Version: 2.4.1
Platform: Compiled Sources
OS/Version: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: Image Editor
AssignedTo: digikam-devel at kde.org
ReportedBy: Tap at people.homeip.net
Version: 2.4.1 (using KDE 4.5.5)
OS: Linux
When I try to use a radius less than 1 with the Unsharp mask method in the
digiKam Image Editor, the image becomes noticeably brighter and shows channel
clipping in bright areas. I do not know the math involved but the GIMP does not
share this behavior -- it simply sharpens the image as requested.
I am using digiKam 2.4.1 but this bug was also evident in 1.9.0.
Reproducible: Always
Steps to Reproduce:
1. Select an image in the lighttable and press F4 to open the Image Editor
2. Go to Enhance > Sharpen...
3. Set the following parameters, for example:
radius 0.3
amount 0.8
threshold 0.00
4. Click OK and compare the before and after images.
Actual Results:
The image becomes noticeably brighter.
Expected Results:
The image should become sharper on a fine scale, but not noticeably brighter.
OS: Linux (i686) release 2.6.32.41-smp
Compiler: gcc
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