I’ve been playing around with Darktable 3.0 to check out the promising new Filmic RGB module and the associated RGB workflow for a while. When I threw the attached test image at it, I discovered black artefacts within highly saturated blue areas. This happens only if “preserve chrominance” is set to “no” or “Luminance Y”. The RAW file shows no signs of clipping in the affected areas, so I suspect a numerical problem. Or maybe I’m doing something completely wrong.
The black artefacts are in the upper right part of the image. Only whitebalance (set manually) and Filmic RGB with default settings except preserve chrominance is used.
No artefacts are created when “preserve chrominance” is set to “max RGB”
Finally, here’s the corresponding RAW file
IMGP7644.DNG (16.1 MB)
I’m using DT 3.0 on openSUSE 15.1
Any thoughts? Thanks!