trying to develop a series of high-ISO shots taken with my EOS R7 in cRAW, I recognized some strange artifacts/areas in the developments. See attached screenshots that should show this clearly.
Interesting thing is, that developing a DNG file generated from the very same Raw via Adobe DNGConverter does not show this behavior.
Has anybody here experienced such a thing before? I would assume, that this is an issue of the used raw-development engine …
Lightroom Classic behaves nicely as desired without any issues with the Raws…
cRAW import is handled by the LibRaw engine. You could try testing just the LibRaw decoding to rule it out first, perhaps via the unprocessed_raw test program they ship (you’ll need LibRaw 0.21 installed on your system).
What are the artifacts…you added an exposure bump to the second image…what do they look like at the same exposure and short of the noise and maybe some issues above the number on the singlet I didn’t notice something clearly different but not sure what I am looking for??
If the white point is wrong, highlight reconstruction may think those areas are overexposed and may try to paint something in? What happens if you disable that module for now?
Another thing you could try is the demosaic module (use a different algo).
Yes, I am talking about the weird blurred regions.
I would also assume this is related more to libRaw than to darktable-internal processing.
If I go back to “history point 0” the regions also are visible.
Here two 100% screenshots of another image in which I see this happening:
“History step 0”
