Re: [APML] Stupid Stacking Question

["Bobby Middleton" <bobm@koyote.com>]

I too have done this and I feel it does yield good results. And with easy
registration software like RegiStar this isn't a big deal.
Bobby M
http://www.koyote.com/users/bobm/astro2.htm

----- Original Message -----
From: <astropix@att.net>


> Thom wrote:
> >couldn't this be done with
> > multiple copies of the same picture?
>
>  Thom...
>
>      There are no stupid questions... only stupid answers. Here comes one
now!
> As others have noted, separate exposures yield the biggest gain in S/N...
but
> following a suggestion by Michael Covington from another list
(AstroAtlanta...
> where Michael hangs out these days)... I first scanned an image...
inverted the
> film 180 deg in the holder... adjusted the scanner settings slightly...
and
> then combined the two individual scans. This didn't increase the info in
the
> detail... but did make the background more managable. Random scanner noise
is
> different on each individual frame... and by inverting/adjusting scanner
levels
> the indivdual film grains recorded on differently in each image... giving
an
> averaging effect to the composite. I ended up with a lo-res image from an
> otherwise junk negative... not up to the standards of this list, but until
I
> get a better exposure of this region... the image is
here ------------------>
>
>      http://home.att.net/~astropix/Trio_in_Leo.html
>
> After my inital trial with SGBNR... this image could benefit from that as
> well... but really isn't worth any more effort, IMO.
>
>  Best...
>
>  Geoff Powers
>
>
>
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