[Digikam-devel] [Bug 127374] New: unsharp mask: max. radius way too small!

[Matthias Wieser]

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http://bugs.kde.org/show_bug.cgi?id=127374         
           Summary: unsharp mask: max. radius way too small!
           Product: digikamimageplugins
           Version: unspecified
          Platform: unspecified
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel kde org
        ReportedBy: mwieser gmx de


Version:           unknown (using KDE 3.5.2 Level "a" , SUSE 10.0 UNSUPPORTED)
Compiler:          Target: i586-suse-linux
OS:                Linux (i686) release 2.6.13-15.8-default

The radius of the "unsharp mask" digikam-imageplugin filter (svn version, as of 15.05.2006) is limited to a radius of 10 which is way too low.

The unsharp mask filter has too uses: to sharpen a image (radius 0.1 to ~5 pixel) and to apply a local contrast enhancement (radius ~5% of image width). The second use case is not possible with digikam's unsharp mask plugin.

Example:
Take a 5MPixel image done at a day with bad weather and apply an unsharp mask with radius: 90 pixel, strength: 0.3, threshold:0. (you can do this with gimp, too)

Would be nice, if someone could remove this artificial constraint of digikam's unsharp mask.