Hi!
Thanks to everyone who responded. I learned quite a bit.
Key learning for me was the massive but on the other hand subtle (so as
not to lose any details) tweaking of the base curve.
In my own experiments I tried to get as much visual information out of
the shadows as possible. Getting the most natural look was not my top
priority, but at the same time I certainly didn't try to create some
sort of artifical "Wow"-effect (pseudo-HDR really is a modern disease).
I think there are three main challenges when pushing the shadows:
1) Avoiding edge artefacts (halos, "burned" edges, etc. see the building
below the highlight but also the mountain edges to the right)
2) Preserving highlights
3) maintaining or even boosting contrast in the shadows
For example I found the tonemapping module to be quite helpful for 2),
but it introduced heavy artefacts, so I dropped it.
Overall I found the contrast in the shadows to low, thereby losing a lot
of three-dimensionality in the buildings.
What I still don't fully understand is the effect on the noise. To me
the dpreview image looks cleaner (esp. in the areas of homogenous colour
the noise has a somewhat "finer granularity"). I leave this to further
experimentation. ;-)
On a sidenote: I'm still on Ubuntu 12.04. To make use of the .XMP-files
I had to compile dt 1.6 from source and encountered the same behavior as
reported in "[darktable-devel] Compiling with Custom CXXFLAGS?" by Rico
Wendrock (my system: Intel® Core™ i7-4770 CPU @ 3.40GHz × 8 and kernel
3.13.0-43-generic). Proposed workaround worked for me. Seems to be a
general problem and not due to one broken gcc installation.
Regards,
Oliver
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