[Bug 115753] New: Option to apply unsharp masking to luma channel only

[Dik Takken]

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           Summary: Option to apply unsharp masking to luma channel only
           Product: digikamimageplugins
           Version: 0.7.3
          Platform: Gentoo Packages
        OS/Version: Linux
            Status: NEW
          Severity: wishlist
          Priority: NOR
         Component: Unsharp
        AssignedTo: digikam-devel kde org
        ReportedBy: d.h.j.takken phys uu nl


Version:           0.7.3 (using KDE KDE 3.4.1)
Installed from:    Gentoo Packages
OS:                Linux

Applying an unsharp mask effect to a digital image (photo, scan, ...) often results in amplification of unwanted chromatic noise. So, I always use the GIMP to split the image into seperate HSV layers and apply the unsharp mask only to the luma (V) channel. After merging back to RGB, it looks really good.

Please add an option to the unsharp mask dialog to only apply the effect to the luma channel. Maybe the option can be called "suppress color noise" or something similar.
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[Gilles Caulier]

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------- Additional Comments From caulier.gilles free fr  2005-11-06 10:08 -------
Try to use Refocus plugin instead UnsharpMask available in 0.8.0 release. Take a look in plugin handbook for more informations :

http://docs.kde.org/development/en/extragear-graphics/digikamimageplugins/refocus.html

Gilles Caulier
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tomalbers kde nl changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |UNCONFIRMED



------- Additional Comments From tomalbers kde nl  2005-12-28 18:37 -------
Dik, close this one?
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------- Additional Comments From mwieser gmx de  2006-05-23 18:40 -------
That's something totally different:
Refocus is a convolution filter.
Unsharp mask is a simple sharpening filter which works by enhancing edge contrast. It's the sharpening filter of choice for "everyday" images. But it's quality can even improved by only applying it to the luma channel. There are many gimp/photoshop/... howtos about this. This can be done with scrips, but digikam does not support scripts. So it would be very convient to include this option into the unsharp mask filter.
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[Dik Takken]

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------- Additional Comments From d.h.j.takken phys uu nl  2006-05-23 20:42 -------
I agree that refocus is something totally different than unsharp masking is. In general, you can't substitute one for the other.
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