Yeah Andrew, I usually use Winjupos on Saturn. I like it because it sharpens edges very well. Need a bit of trial and error until an image measurement fit in an exact spot (in another word you never know what is an exact fit. It is a guesswork
). But an issue is an artifact underneath the ring. Sometimes the shadow gets funny artifact as well. My image was derotated three stacked files (3 minutes video each) into one.
Took off a little bit of green from Jupiter and reposted
Hisanori