[Digikam-users] New image editor noise reduction plugin...

Gilles Caulier caulier.gilles at kdemail.net
Tue Mar 14 08:55:37 GMT 2006

A new version of the diff file is availalble at the same place:


 I have fixed some settings limit to prevent crash, especially with advanced 
parameters, and fixed some uninitialized variable in memory (thanks Mr 


On Tuesday 14 March 2006 12:03 am, Caulier Gilles wrote:
> Hi all,
> I have recently backported the new despeckle algorithm from gimp 2.2.x to
> digiKam like noise reduction tool with support of 16 bits images.
> After to have played with it, i have been unsatisfied... The result are a
> little bit strange, especially with recursive option.
> After to have serching on the web the best NR technics, my conclusion is
> that this algorithm is a wrong way. despeckle use RGB color space to fix
> noise and this is a wrong issue.
> After to any investigation, i have found a great GPL plugin tool named
> dcamnoise2. The code is really impressive and very well documented...
> I have backported the code this week end, and the result look great :
> http://digikam3rdparty.free.fr/Screenshots/new_noisereduction_plugin.png
> The only one NR tool that i have already used witch provide a similar
> result is Noise Nija plugin for photoshop... If you want to test it, there
> is a diff file against current NR tool implementation from svn trunk here :
> http://digikam3rdparty.free.fr/misc.tarballs/nr.diff
> To test it, just go to digikamimageplugins/noisereduction directory, and
> apply it like this:
> # diff -p0 < nr.diff
> make, and install the plugin. You can play with it in digikam. There are
> some noisy images to use here :
> http://digikam3rdparty.free.fr/Images_2_Test_DImg/NOISE/
> To use it, especially with parameters, I recommend you to read the comments
> of the algorithm author from the original gimp plugin source code here :
> http://digikam3rdparty.free.fr/misc.tarballs/dcamnoise2-0.63.c
> Nota :
> - The most important settings are in General tab.
> - The plugin do not support yet 16 bits images. It's just a question of
> time. I will do it later, if the fedback is right from digiKam users.
> Please, let's me hear your viewpoints. Thanks in advance...
> Gilles Caulier
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