I'm not altogether "up" on Registax but I had a go on a Ha .avi of the Sun. I stacked 2000 or so frames and ended up with a 534k picture. However, I went to the Resize box and ramped up the size, with Lanczos filter applied.
This gave me a good 5mb .tiff image at the end.
Out of interest, have you tried AutoStakkert as an alternative to Registax? I generally do the align etc in that then save the file and use Registax for the wavelet treatment.
Stu
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