Re: [APML] Combining (scratched and unscratched) Images in Registar

["Bert Katzung" <katzung1@attbi.com>]

OK, I checked out the "fudge-a-third-image" method that I suggested earlier
(approach number one below). It works fine. I find Registar a bit confusing
when dealing with more than two images but once I got it to put the 3 images
(one good original, one good dup, one bad original) into the same "group,"
it did a median combine and eliminated all the extraneous stuff in the bad
original. (Has anyone written a good SIMPLE explanation of the groups
manager (or whatever it's called) in Registar?)
Bert

Bert Katzung
katzung1@attbi.com
www.astronomy-images.com

----- Original Message -----
From: "Bert Katzung" <katzung1@attbi.com>
To: <astro-photo@seds.org>
Sent: Thursday, October 17, 2002 9:28 PM
Subject: Re: [APML] Combining (scratched and unscratched) Images in Registar


> Hi Kevin:
> Two approaches:
> 1. Matt's solution using median combine with 3 images might be fudged by
> making a duplicate of your better image so that you have 3 images, 2
"good"
> and one "scratched." Now run the median combine. Of course you won't get
the
> random noise reduction (grain, etc) that you would get with 3 independent
> images, but you should get rid of scratches that are only present on one
> image. Warning: I haven't tried this but I don't see why it wouldn't work
> <G>.
> 2. Use Registar to register and crop-pad (match but don't combine) the two
> images. Then superimpose the two images as separate layers in PS and run
the
> "Dust and scratches" filter (Filters/Noise/Dust and scratches) on the
> scratched layer. A bit of Gaussian blur may help also. Then flatten the
two
> layers for your final. Alternatively, run the PS Dust & scratches on the
> scratched tif file before running Registar. Depending on how bad the
> scratches are, you might be able to come up with something pretty
reasonable
> with very little hand retouching.
> Let us know what happens----
> Bert
>
> Bert Katzung
> katzung1@attbi.com
> www.astronomy-images.com
>
> ----- Original Message -----
> From: "Kevin Wigell" <kwemail@twcny.rr.com>
> To: "APML Discussion List" <astro-photo@seds.org>
> Sent: Thursday, October 17, 2002 6:01 PM
> Subject: [APML] Combining Images in Registar
>
>
> > Is there a way in RegiStar to combine two images such that information
> that
> > is only on one of the images will not be in the combined image? I have
two
> > negatives that have many, many small scratches. It will take me hours to
> > remove the scratches by hand in Photoshop. I was thinking that if I
could
> > combine them in RegiStar so that only the information that is common to
> both
> > ends up in the combined image, I could get rid of most of the scratches,
> > then finish the clean-up by hand in Photoshop.
> >
> > Anyone know if this can be done?
> >
> > Thanks,
> > Kevin Wigell
> >
> >
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