I am using Darktable as my RAW processing software. In darker pictures that have been taken with an ISO of 800 or more, I frequently encounter great issues with luminance noise.
After doing some standard edits like changing exposure and adding contrast, the noise becomes more notable as can be seen in the next two images. Here, color denoising was already applied but nothing for luminance.
Those artifacts look similar to what a phone camera puts out when you take a picture too dark with it, so I assume it's not a completely obscure problem that I am encountering here.
When I tried to replicate something similar in Adobe Lightroom, the denoising was so much better (see next two images). So apparently, it is possible to implement a better denoising procedure in theory.
I wonder, is there a step that I am missing in my editing workflow which causes these artifacts to be there, or is it simply a bad algorithm that is used by Darktable and there is nothing I can do to improve the image?