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Roland;
I don't have the latest version
of RegiStar loaded, so perhaps someone else can comment on whether or not there
are more methods of stacking beyond average and overlay. I believe median
combine is available. Where RegiStar really shines is in areas that you don't
have problems with CCD. Film can distort or change dimensions slightly with
humidity, or can buckle slightly. My understanding of Maxim suggests that when
an image is rescaled or rotated, it is applied equally to the entire image. If
one image has non-linear distortion due to humidity, the stars could
never line up across the entire image. With PW this can be done, but requires
many registration points to set up and a lot of checking in "difference" mode.
Registar aligns on EVERY star in the image.
As Bobby pointed out, alignment
of mosaics against a widefield image to reduce edge distortion is easy in
RegiStar. I don't know if Maxim will align just the outer edges of an image.
Registar is often used to clean up lateral chromatic problems with cheap
refractors. Within Registar you can break an image into RGB, align the colours
and recombine. This really helps clean up blue halos which are displaced more
around the edges of an image than they are in the center. Not that you
would have to worry about this.... <g>
John Mirtle
Calgary, Ab. Canada
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