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Okay, here's what I did...
step 1 - break each colour frame into 3 monochrome frames (red,green,blue).
step 2: process all the red frames through registax and astra image, make a final red master
steps 3 and 4, same as (2) for the other colours
step 5: recombine the red,green and blue frames in astra image.
Doing each colour seperately allows registax to get a better lock on the details, it's evident that the colours all all slightly out of alignment in the raw frames, this is normal for an object that's low in the sky.
Processing the frames in colour mode makes life tough for registax, as the images all look a little blurry, so I don't do that.
The other processing step in Astra Image was to use the "maximum" filter, it has the effect of narrowing the cassini division back to where it's supposed to be, and Maximum Entropy deconvolution.
I used the commandline netpbm tools to automate the splitting of colour planes, via a short shellscript on my Linux machine (sorta like a batch file if you're using Windows).
regards, Bird
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