I tried different export formats using different bit depths.I tried setting “high quality resampling” to “no”.I use AMaZE as demosaic, but also tried PPG and VNG.I export at the same size as the original RAW file.
non-local-means), but again, I set the profile as above and increased the patch size to 7. One using chroma preset (wavelets auto) and manually set profile to “DSC-RX100M5A iso 1600”. I use two “denoise (profiled)” instances.So it does not seem to be related to the image viewer. When loading the exported JPG back in darktable I can see those noise/grain in darktable, too. Unfortunately I cannot share the whole image or raw file :/ (NOTE: The cyan colors are caused by the gamut check. You can see it in the screenshot I made, for example the structure of the white lines (on the left side you can see darktable and on the right the exported JPG).
When I export that image as JPG (Quality 100), view it at 100% and compare the result to the image shown in darktable at 100% I can see that the exported JPG is not as soft as shown in darktable, but noisier/grainier. I used darktable to reduce noise of a high ISO image.
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