Gimpで高ISOノイズを除去する方法


14

それで、暗い場所で高いISO値で写真を撮りました。撮り直すことはできません。粒子の効果が悪いので、これが良い写真になることはないと思いますが、それでも最大限に活用したいと思っています。では、写真編集ソフトウェアと... それでは

ISOノイズを最大限に低減し、画像を最大の鮮明度に復元するために適用するフィルター/ツール/手法は何ですか?

GIMPをお勧めしますが、他のオープンソースソフトウェアで動作する優れたテクニックを知っている場合は、ぜひ共有してください。

5

I'm not sure about GIMP, I use Lightroom 4 and there is this wonderful plugin Noiseware 5. I used it myself and I got good results. Some report Noise Ninja to be a good tool too but I didn't try it myself.

I'm sure that you can do this in GIMP without plugins, a quick googling results that maybe helpful:


3

Usually, the blue channel has more noise than the others. So an old trick is applying a slight blur to the blue channel might help.

That said, noise reduction software like Noiseware and Noise Ninja are so far advanced beyond this old trick that you might find it worth your time and money to look into a more automated solution.


1

You can always scale down your picture to reduce noise. The scaling operation will average groups of noisy pixels, this cancels some of the noise out. You can do this alone or after you apply other noise reduction techniques.


4

Adding some info to Akram's answer.

You could use try some of the filters from G'mic (a "plugin pack" for the Gimp which has a lot more filters than just noise removal ones). Here's its website and download page.

For a tutorial: Noise reduction with G'Mic . An excerpt:

Anisotropic Smoothing is the best solution for pure noise reduction, it can be found under Enhancement and will give you the lower loss of details, and last but not least is really easy to setup. [...] Generally you should have really good results with default values, if you need more sharpness, change the value from 0.70 to 0.90.

When I'm in a hurry I personally use Iain's Fast Denoise because it's faster.


2

The Wavelet denoise GIMP Plugin might be interesting for you. See for example this video tutorial and Post processing on low light/fast shutter photo.

I think RawTherapee also has wavelet tools (I'm no expert, though), see http://scribble-jpc.blogspot.se/2015/03/first-view-wavelet-tool.html and http://scribble-jpc.blogspot.co.uk/2012/07/first-look-rawtherapees-new-noise.html in case you are looking for any open-source solution.