[Bug 224293] New: wavelets NR tool confuses red and blue

[S. Burmeister]

https://bugs.kde.org/show_bug.cgi?id=224293

           Summary: wavelets NR tool confuses red and blue
           Product: digikam
           Version: unspecified
          Platform: openSUSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Version:           1.1.0 svn (using KDE 4.3.4)
OS:                Linux
Installed from:    openSUSE RPMs

svn Rev: 1079999


I noticed a lot of blue spots in the black areas and thus set luminance and
Chrominance red to 0, i.e. only used Chrominance blue, yet the blue spots did
not go away. Then I set blue to 0 and red to some value >0 and the blue spots
disappeared.

So here is my dumb question, am I wrong assuming that red should get rid of the
red spots and blue of the blue ones and that there is a bug that those two are
interchanged?

Then I thought that maybe a treshold of 0 means that it will erase all kinds of
blue. Yet if I set both red and blue to 0 I get more blue noise compared to
blue set to 0 and red to some value >0. Which seems odd as I did not change any
value for blue thus blue noise should stay at the same level.

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=224293


Gilles Caulier <[hidden email]> changed:

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--- Comment #1 from Gilles Caulier <caulier gilles gmail com>  2010-01-26 09:34:17 ---
I agree, sound like something is inverted somewhere.

To be sure, can you test with this gimp tool if problem is the same, because
it's the same algorithm used (in YCbCr color space)

http://registry.gimp.org/node/4235

Thanks in advance

Gilles Caulier

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=224293


Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |Noise Reduction
            Version|unspecified                 |1.1.0
            Product|digikam                     |digikamimageplugins




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[S. Burmeister]

https://bugs.kde.org/show_bug.cgi?id=224293





--- Comment #2 from S. Burmeister <sven burmeister gmx net>  2010-01-26 10:44:37 ---
Ok, I think I got it.

Gimp shopws some tooltips and explains that the treshold is the value below
which everything is considered noise. I think it might be useful to add this to
digikam as well.

Further. If I set Y and Cb to 0 I get the full blue noise. Increasing the
treshold for Cr does not change anything about that so it seems that digikam
has a bug.

Increasing Cb gets rid of the blue noise.

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=224293


Gilles Caulier <[hidden email]> changed:

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




--- Comment #3 from Gilles Caulier <caulier gilles gmail com>  2010-01-26 11:39:01 ---
SVN commit 1080460 by cgilles:

CRed and CBlue parameters are inverted
BUGS: 224293


 M  +20 -20    noisereductionsettings.cpp  


WebSVN link: http://websvn.kde.org/?view=rev&revision=1080460

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[Gilles Caulier-4]

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Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Version Fixed In|                            |1.1.0

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[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=224293

[hidden email] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|digikamimageplugins         |digikam
          Component|Noise Reduction             |Tool-NoiseReduction

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