Quote Originally Posted by Tannin View Post
The lines are curved. Banding as a sensor issue, as a PP issue, as a firmware issue, and as a monitor issue should produce straight lines! At least I can't see how the maths could make sense if any of the causes mentioned just now are relevant.

Curved lines just about have to be coming from a waveform disturbance: i.e., something optical (lens weirdness) or something electrical (interference patterns - something that I'd have only expected to apply to analogue monitors and signal chains. I just can't see how these lines can be a digital artifact.

PS: you are not doing any picture-bending PP by any chance? (De-fishing or similar.)
Very true, good points.