rob, ppm centre works well here. if you convert all avis to bmps and then centre them then registax can't move em.
if you splilt the movies and then process each colour separately, then you end up with a different reference frame more than likely, which because the tracking is not perfect could be in a different place.
hence into astra image, you have to move it. i magnify at least 3 times and then align each colour.
depends on how good it is looking to start with. if the data looks great, go the whole hog, ie split, ppmcentre, registax astra image etc
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