denoising in darktable is somewhat tricky:

Use the *denoise (profiled)*, set it to "wavelet" and set blend mode to "color". This eliminates the awful color noise. Use a *second instance* of denoise (profiled), set it to non-local means and choose blend mode "lightness". With that second instance i'll usually reduce the strength or opacity to my liking to keep some detail.

You can set some presets and have them apply the correct denoising automatically.

This info is also available in the manual https://www.darktable.org/usermanual/en/correction_group.html, under Denoise – profiled -> mode.


On 2018-03-07 19:59, darkta...@911networks.com wrote:
DT 2.4.1

I'm having problems with the denoising:
Canon 7DMkII and Canon 70-200L IS f/4 ISO1250

* before denoise: https://i.imgur.com/k9Njy70.png
* denoise profiled: https://i.imgur.com/Unw2i8O.png and it's very
* equalizer denoise: https://i.imgur.com/8E1CzHt.png (w/o the
   denoise profiled). Less blotchy than profiled but not good either.

I have also tried Rawtherapee
* after noise reduction: https://i.imgur.com/Js5ZGfd.png and it's

What can I do to improve the image?

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