To get an image squeaky clean, you can set the blend mode to multiply and then work the opacity slider to taste. Mind you, this tends to make things a bit clinical.

Jack


On 2018-03-07 12:10 PM, darkta...@911networks.com wrote:
Thanks to all. It does help.


On Wed, 7 Mar 2018 20:36:14 +0100
Matej Martinovic <matejmartino...@zoho.com> wrote:

Hey,

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
3.4.4.3. Denoise – profiled -> mode.

BR
Matej


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

Darktable:
* before denoise: https://i.imgur.com/k9Njy70.png
* denoise profiled: https://i.imgur.com/Unw2i8O.png and it's very
    blotchy
* 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
    excellent

What can I do to improve the image?


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