On Wed, 7 Mar 2018 20:36:14 +0100, Matej Martinovic 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 
> Denoise – profiled -> mode.

I've tried this also a number of times, and also find the NR from
Darktable unsatisfactory compared to RawTherapee.  I'm using a
7DnmkII, typically at ISO 6400-8000.  I've posted a number of examples

It's unfortunate; there are other reasons I'd prefer to use Darktable,
but when I need significant noise reduction, the artifacts I get are
simply not satisfactory.

> 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?

Robert Krawitz                                     <r...@alum.mit.edu>

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