[bird (Anthony Wesley)]

Registax is very sensitive to these settings, and they interact in ways that might not seem obvious...

I mostly use 128 pixel alignment boxes if the seeing is good - the important thing is that each box must be placed around a feature that's (1) easy to see , and (2) fits inside the box. This will depend on your image scale of course, but the grs is an example of a feature that's very useful for alignment, and also the very dark storms in the northern belts are good.

You have to avoid areas where there is little or no detail, or where the detail is only in one dimension (eg a horizontal divide between 2 belts).

It takes a bit of practice to find the best places, and again it all depends on your image data.

I try and set 4 or 5 alignment boxes that are completely inside jupiters disk. You can choose to have your alignment box include black space around jupiter if you like but if the seeing is not so good then the alignment may be thrown off by the movement of the planets edge.

Then, as DP mentions above, when you've set all your alignment points go into "general options" -> "fft size" and change the size from the automatically chosen value to something like 9 or 10. If this doesn't seem to work for you (cause your data is probably different to mine!) try other values, both larger and smaller, until you find the right one that produces the least seams.

Smaller values for this size will make the alignment run less prone to noise, but if you make it too small then it will lose the features as well. Smaller values = more blurring.

cheers, Bird