[Bug 225491] New: Unsharp mask artifacts (value overflow?)

https://bugs.kde.org/show_bug.cgi?id=225491

           Summary: Unsharp mask artifacts (value overflow?)
           Product: showfoto
           Version: 1.1.0
          Platform: Ubuntu Packages
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Version:           1.1.0 (using KDE 4.3.2)
OS:                Linux
Installed from:    Ubuntu Packages

Using unsharp masking can lead to solarisation-like artifacts in near-black or
near-white areas.

Use unsharp masking. If necessary, apply several times to achieve the effect or
make it more visible.
Look at areas that were near-black or near-white before sharpening.
They should tend even more towards the extreme now, at least at their borders.
Instead, where one would expect the result to be whiter than white, you will
find a dark area and vice versa.
So even the slightest sharpening of an image which uses all the available tonal
range will damage highlights and shadows.

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=225491


Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[hidden email]
          Component|general                     |Unsharp
            Product|showfoto                    |digikamimageplugins




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[Gilles Caulier-4]

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--- Comment #1 from Gilles Caulier <caulier gilles gmail com>  2011-12-17 19:08:58 ---
Droebbel,

This file still valid using digiKam 2.4 ?

Gilles Caulier

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Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |DUPLICATE




--- Comment #2 from Gilles Caulier <caulier gilles gmail com>  2012-01-02 22:56:46 ---


*** This bug has been marked as a duplicate of bug 290442 ***

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[hidden email] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Unsharp                     |Tool-Sharpen
            Product|digikamimageplugins         |digikam

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