The colour look is a simple colour adjustment layer (Colour Balance in darktable) with a warm yellow cast on the highlights (increase red and reduce blue on slope) and a blue cast on the mid tones (increase red and reduce blue power).
The rest is a shadows/highlights adjustment to tame the dynamic range and a curve to adjust contrast to taste. I also boosted the saturation of the mid-tones using a colour adjustment layer with a luminance mask.
Yes, difficult!
I believe that @s7habo presented a dt tutorial on something similar, x months ago…
Have fun!
Claes in Lund, Sweden
That was a difficult task. Done with darktable and GIMP.
just testing darktable 3.0.0.rc2
20191001T162108.ORF.xmp (16,3 KB)
This is a quick edit with RT5.7dev. The main tool has been Wavelets, with a good help from Shadows/Highlights.
I don’t know if it would be to the liking of everybody, but from there the contrast, noise reduction, color and details could be changed to taste.
The main problem (the high contrast of the mountain) has been reduced to a workable level, I think.
20191001T162108.png.out.pp3 (11.4 KB)
I’ve downscaled it because the resulting image was huge at 100%. But you have the pp3 to check it locally, if you want. No sharpening applied.
Thanks to all for the many edits!
filmicRGB + tone equalizer do a great job on this image in dt 3.0. The result look quite natural to me.
20191001T162108.ORF.xmp (8.7 KB)
@pk5dark, nice. Any chance you can manage a less bright mountain that shows more detail? I haven’t tried darktable 3 and the tone equalizer yet and am looking forward to doing so!
dt filmic + colour balance + local contrast only:
running the extra mile on top of that with tone equalizer:
I’d like to check the sidecar but laying in bed with my phone. Shoud finally sleep. So tomorrow. But thanks for participating. I like your results somehow similar to mine aren’t they?
Thank you for the amazingly challenging photograph. Quite beautiful as well. This one really made me put the filmic videos to the test. Along with some color balance and a few other things I enjoy using.
darktable 3.0.0rc2: 20191001T162108.ORF.xmp (9.1 KB)
Middle of the night insomnia. Abstract take.
PhotoFlow demosaicing (blend, RCD), lens correction (all), rotation, Rec2020 linear float
gmic HLG, dehaze (broken), brighten-contrast (test), sharpen (FFT), crop, resize
Zoom 100% and enjoy!
I think it is interesting that few people here use masks.
I did not feel the need for any parametric or drawn masks. The Tone Equalizers guided mask did a great job allowing control over the different regions.
Yes, but @anon41087856 is the benchmark here ;-). Since I watched his video about filmic I’ve an idea what to do and I’m really impressed by the power of filmicRGB (and tone equalizer) now.
I prefer your version as the areas in shadow are that bit darker and more believable/natural-looking to me. A lot of versions here have the path and trees in shadow very light and saturated which looks over-cooked to me when viewed as part of the scene as a whole, but I’d say you’ve just about avoided that. Mine may be too dark. 
I enjoyed both of your entries. 
