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

[Caulier Gilles]

Le Mardi 14 Mars 2006 12:03 AM, Caulier Gilles a écrit :
> 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...

Forget to said that i need some RAW file samples taken with important noise to 
test 16 bits image support. You can capture these pictures to boost ISO 
settings of your camera for example. 

Thanks in advance

Gilles Caulier