Let me explain how I found this issue. It might help you understand my process and perhaps sort out things other than outlier clipping. From my Play Raw processing, I notice something peculiar. That I was getting more noise issues than other members’ edits. I wanted to know the reason. One thing that influenced the noise and artifacts was the raw developer setting here:
clip negative values on or off yield different results; among other factors, artifacts and noise. Couple this with export colour space and encoding, you would have different combinations and results.
Early on, I would simply go the Rec2020 linear no-clip route but then I started alternating among
– Rec2020 linear no-clip + pass through (Working profile)
– Rec2020 linear no-clip + sRGB linear
– Rec2020 linear no-clip + sRGB standard
– Rec2020 linear neg-clip + pass through (Working profile)
– Rec2020 linear neg-clip + sRGB linear
– Rec2020 linear neg-clip + sRGB standard
First thing I noticed while making the comparison was that colour space conversion in export could create negative values, which a user would not expect but makes complete sense if one understood what was going on. Raw developer gives the user the power to choose to clip or not. Export doesn’t.
The other thing was that certain combinations yield uglier results than others. In my preliminary G’MIC experiments, I found the bolded combination yield the best minimal raw starting point.
Source: my colour Play Raw post.
where the girl’s iris and the woman’s hair doesn’t have much detail left due to noise and artifacts. I tried (not very hard) to correct some of that in the image but it still looks bad compared to the top one that only has minimal processing to bring up the brightness and contrast.
PS I didn’t do Rec2020 with another encoding. For now, I am satisfied with Rec2020 linear and don’t have the time or energy to experiment combinations with another encoding combination.
PPS It isn’t only detail in the shadows but also in the highlights. The highlighted region of the woman’s nose is small in the bolded combination.