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I often use VirtualDub to delete the bad frames, where the frame is obviously blurry due to bad seeing, bumping the scope or when the planet slightly drifts out of the FOV and I use my EQ platform speed control knob to bring it back in.
I then save the avi as a bmp sequence, which I then run through ppmcentre to reduce the height/width to 400/400 and centre the planet in the frame.
All of this appears to:
a) Help registax align on the features better
b) Helps registax process faster (thanks to reduced frame size)
It generally produces a better image for me, but sometimes I don't do it and I think I get just as good a result.
The reasons I don't do it all the time, is simply because it adds at least 20 minutes to processing an avi, much longer if you spend a lot of time deleting bad frames in virtual dub.
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