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 3.4.4.3. > 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 here: https://rlk.smugmug.com/Photography/DarktableRawTherapee/i-pZbDfRH 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> *** MIT Engineers A Proud Tradition http://mitathletics.com *** Member of the League for Programming Freedom -- http://ProgFree.org Project lead for Gutenprint -- http://gimp-print.sourceforge.net "Linux doesn't dictate how I work, I dictate how Linux works." --Eric Crampton ____________________________________________________________________________ darktable user mailing list to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
