Digikam/Støjreduktion

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Støjreducering i digiKam

Fra Mohamed Maliks blog, 12. februar 2011

Alle DSLR-kameraer introducerer støj i en eller anden grad. Dette gælder især almindelige kameraer til ikke-professionelt brug, selv om disse har ret god ISO-ydelse op til omkring ISO 800.

Jeg bruger et Nikon D3000 og dets ISO-ydelse er god op til ISO 800. ISO 1600 er god og kan bruges i små størrelser; men billeder i ISO 3200 bliver kornede og støjreducering skal anvendes.

If you are using digiKam it has a great noise reduction tool. Double click the image where you want to reduce noise and give a right click -> Edit. You can even press f4 on the keyboard and it will do the same thing.

After this you will be presented with the editor view.

From here go to Enhance -> Noise Reduction and you will be presented with this window.

Choose from the settings or you can choose your own settings. Here is a picture of before and after from my tests. They are much more usable and better looking after the noise reduction has been applied.

Before Noise Reduction Was Applied:

After Noise Reduction Was Applied:

Here is another picture in which the noise reduction was applied:

After:

Tip

Matthias Welwarsky added "What I like most about the denoise tool is that I can apply separate amounts of reduction on luma and chroma. This helps a lot in preserving detail while giving a smooth color impression. Luminance noise becomes grain and color blotches are eliminated."