Hi Marc. I have to admitt I always considered the best registration tool I had but of late playing with RGB filters and NB filters and a mix of both it has let me down a bit, maybe not quite this graphically but it has struggled none the less.
I have found that an initial alignment in Images plus also leaves a bit wanting but then to run the aligned images through Registar does seem to improve the end result.
CCDIS and CCD Stack seem to suffer a similar problem when carrying out an initial registration of mixed data.
I don't know what the answer is.
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