@kendal I examined your raw file briefly and I didn't see anything wrong or suspicious on RawTherapee's side. RawTherapee has good per-ISO support for the Panasonic DMC-GX80/DMC-GX85/DMC-GX7MK2.
@ilias_giarimis added the per-ISO white levels for your camera, maybe he knows what's up, if anything.
The question remains why the thumbnail of the RW2 is so different from the raw data. It's normal for the raw data to look flat and underexposed, but not that much. There is a possibility that RawTherapee expects an e.g. 12-bit raw file while this is a 10-bit one. Such a situation would explain the thumbnail, but I saw no sign of that being the case.
I see two reasons to believe that what RawTherapee shows is indeed correct:
- The raw values of your photo match the ones from
and this cat photo matches the thumbnail when applying the usual tone curve.
- The DNG thumbnail is usually more reflective of the real raw data than the out-of-camera RW2 thumbnail. In this case the DNG thumbnail matches what RawTherapee shows. It's not likely that both RawTherapee and Adobe DNG Converter would be wrong.
That would mean that your out-of-camera thumbnail lies - not surprising.
Assuming that RawTherapee does in fact show you the raw contents correctly, I created a PP3 as a starting point for your camera. It's based on that cat photo which is better exposed, and the tone curve in this PP3 is similar to the one you would find in the DCP - i.e. you don't need to use the DCP.
Panasonic DMC-GX80 natural.pp3 (9.3 KB)