I don’t know if you’d want this in the “current knowledge” thread in the uploader discussion forum since only you have posts there, but I wanted to mention that for deviantart images that are provided as the fullview jpegs, editing the quality parameter from q_xx (usuall 75 or 80) to q_100 at least gives far better quality. If the DA uploader doesn’t do this already, it should (I just checked some DA-sourced pics which do have the notable artifacts of non-fixed urls. Although I suppose one of the png fixes may work on those images).