I was searching for this topic, but could not find anything comparable. I have a lowkey image, which I wanted to process with DxO PL 5 (latest version). When I export it to JPEG or even TIFF PL create block artifacts in the dark areas. The vignette filter is disabled (I saw the bug description). When I process the same CR3 raw file with Mylio I do not get such artifacts. So PL is doing something wired here.
Artifacts (increased brightness to show the issue):
@Tobi , you could attach the original raw file and the sidecar .dop file for us to check. Please also add a screenshot of the output settings you used.
I see some posterization, which is usually caused by insufficient bit depth and adjustments that surpass “normal” adjustments by a wide margin, like e.g. brightening an image that was way underexposed:
Both images have been raised by 7 EV using the tone curve (change from 255/255 to 15/255) and the Exposure Correction tool set to +3. No other corrections were made.
It seems like banding issues, which normally occur in dark areas when there are little bits available.
You said you also have it when exporting TIFF. Did you try 16bit TIFF, you’re sure?
Sometimes adding a small amount of (almost invisible) grain could help. But that would seem like a workaround that should not be needed, in my opinion.
If the 16bit exported has no issues, but JPEG / 8bit TIFF do have issues… it means that DxO seems to change it entire pipeline to 8bit or something when exporting to a 8bit file format. Which seems wrong (normally, you run the pipeline in the full quality available, and convert it to the output format as the last step when everything is done).
thanks for your feedback. I need to check why I did not receive any notification. Sorry for the delay. I am using Windows 11 as OS. To make the effect visible, I do not need to change image, just apply PureRaw and export to JPG.
Here a screnshot from the live preview of the CR3 (on the left I
brightness and gamma to show artifacts):
For tiff I have to correct my original post. Within DxO PL it is fine, the artifacts I saw where within Mylio and disappeared when adjusting the sliders. So tiff should be alright (I will edit the inital post - I can not edit ):
Here the same picture without adjustments exported within Mylio to jpg, in the dark areas I see some to be expected artifacts. Something just goes wrong in DxO PL. I had a similar issue with another image in the past, but did not further investigate. When I find it, I will add it to the thread:
why is this only happening in PL and not in another tool like Mylio? The workaround here is then the export to tiff and then creating from the tiff the jpg in Mylio. For me this still lools like a bug. Another example: On the left you see the JPG export from DxO PL, on the right you see a TIFF exported to Mylio and then a JPG generated by Mylio out of it: