On Thu, Jul 21, 2011 at 5:51 PM, Mikael Ståldal wrote:

Is there any better noise reduction filter for GIMP than the built in Wavelet Denoise? It does remove the noise, but also make the image a bit blurry.

Try the GMIC plugin. There are 2 methods in that plugin that do a great job of noise reduction, but the options are so vast and complex, it's tough to know where to start. There are a couple of tutorials online that show you how to use GMIC specifically for noise reduction. Unfortunately I've misplaced those links.

-- Frank Gore
www.ProjectPontiac.com

Le 21/07/2011 23:51, Mikael Ståldal a écrit :

Is there any better noise reduction filter for GIMP than the built in Wavelet Denoise? It does remove the noise, but also make the image a bit blurry.

Wavelet Denoise in ufraw has the same problem.

I know it is possible to do it better since my new camera, Canon PowerShot S95, does it better when saving to JPEG. But the camera doesn't do noise reduction when saving to RAW.

There are several denoising scripts here : registry.gimp.org/ I like Unsharp Mask 2 0.12 which gives me very fine results (I use only the first five settings).

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On Thu, 21 Jul 2011 23:51:20 +0200, Mikael Ståldal wrote:

Is there any better noise reduction filter for GIMP than the built in Wavelet Denoise? It does remove the noise, but also make the image a bit blurry.

Try Selective Gaussian Blur - it often gives very good results (just lower the threshold).

On 07/21/2011 03:14 PM, JPL wrote:

Le 21/07/2011 23:51, Mikael Ståldal a écrit :

Is there any better noise reduction filter for GIMP than the built in Wavelet Denoise? It does remove the noise, but also make the image a bit blurry.

Wavelet Denoise in ufraw has the same problem.

I know it is possible to do it better since my new camera, Canon PowerShot S95, does it better when saving to JPEG. But the camera doesn't do noise reduction when saving to RAW.

There are several denoising scripts here : registry.gimp.org/ I like Unsharp Mask 2 0.12 which gives me very fine results (I use only the first five settings).

In your camera it's able to do a black shot to get the average noise of your sensors. That gives it a HUGE advantage. It can just subtract that from the image. Some of the sensor wells are always more noisy than others. You can do the same if you know a bit about graphics, take a few shots with your lens cap on in raw mode, get them on to your computer, make a noise mask with averaged values from each pixel, then subtract that from all your raw images. Surely there's someone's software that can do that already given the black images. Anyone?

Patrick

On Fri, Jul 22, 2011 at 2:50 PM, Patrick Horgan wrote:

In your camera it's able to do a black shot to get the average noise of your sensors. That gives it a HUGE advantage. It can just subtract that from the image. Some of the sensor wells are always more noisy than others. You can do the same if you know a bit about graphics, take a few shots with your lens cap on in raw mode, get them on to your computer, make a noise mask with averaged values from each pixel, then subtract that from all your raw images. Surely there's someone's software that can do that already given the black images. Anyone?

Black frame noise reduction only applies to long exposures for removing hot pixels. It does nothing beneficial to reduce high-ISO noise.

--
Frank Gore
www.ProjectPontiac.com

Frank Gore writes:

On Thu, Jul 21, 2011 at 5:51 PM, Mikael Ståldal wrote:

Is there any better noise reduction filter for GIMP than the built in Wavelet Denoise? It does remove the noise, but also make the image a bit blurry.

Try the GMIC plugin. There are 2 methods in that plugin that do a great job of noise reduction, but the options are so vast and complex, it's tough to know where to start. There are a couple of tutorials online that show you how to use GMIC specifically for noise reduction. Unfortunately I've misplaced those links.

I believe the most important G’MIC filters are:

- Anisotropic smoothing - Patch-based smoothing

both under the "Enhancement" menu. See

https://jcornuz.wordpress.com/2009/02/07/gmic-next-gen-greycstoration/ http://www.gimpforphotos.com/tutorials-beginner/noise-reduction-with-gmic.html

for some more information.