[Digikam-devel] [Bug 210581] New: Wish: a tool for purple fringing elimination

[Francisco Lorés]

https://bugs.kde.org/show_bug.cgi?id=210581

           Summary: Wish: a tool for purple fringing elimination
           Product: digikam
           Version: unspecified
          Platform: SuSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel at kde.org
        ReportedBy: plores at telefonica.net


Version:            (using KDE 4.3.1)
OS:                Linux
Installed from:    SuSE RPMs

Purple fringing is a well known and awful effect which often affects some
lenses. It occurs mainly when taking highly contrasted images (dark subjects
against strong background highlights) with wide-angle lenses and large
apertures. A digiKam tool for image defringing would be very interesting, and
it doesn't seem too complicated to implement. An example algorithm can be found
at

http://tams-www.informatik.uni-hamburg.de/applets/hades/webdemos/00-intro/02-imageprocessing/purple.html

Here a simple algorithm written in Java is run under University of Hamburg's
Hades simulator. The effect can be clearly seen in the output vs input images.
However, as also stated in the page above, it would be desirable to combine the
defringing algorithm with edge detection to avoid artifacts in areas with
genuine blue shades.

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