[APML] Noise Reduction was Deep M81 (12 Hours) (My image...really!)

["Robert Gendler" <robgendler@worldnet.att.net>]

Thank you to everyone who responded.
I found a little technique while trying to deal with a blotchy background
from deconvolution. I first deselected the galaxy (select,
feather,deselect).
I then selected all the background pixels using the color range tool using
a "fuzziness of about 12. You need to be careful at this stage to avoid
selecting any small background galaxies.I then blurred the background
pixels using "dust and scratches" at a radius of 3. This smooths the
background
but is unnaturally smooth. I then reinject some noise by using "add noise"
using gaussian mode at about 1 to 3%. Then use the fade function (under
edit)
to fine tune the background noise (image mag to 400%) to your satisfaction.
Basically I'm removing all the noise and then reinjecting some noise to
achieve
an acceptable appearance without an unnatural blurred look.

Rob Gendler
email: robgendler@att.net
Web Site: http://www.robgendlerastropics.com
----- Original Message ----- 
From: "Robert Gendler" <robgendler@worldnet.att.net>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Friday, March 11, 2005 7:49 PM
Subject: Re: [APML] OT: Deep M81 (12 Hours) (My image...really!)


> Bobby,
> Thanks. Those are deconvolution artifacts. I usually try to replace the
> deconvolved stars with a separate layer (predeconvolved image) but
> I was so busy with the rest of the image I sort of neglected to fix the
> stars. I'm sure you know what its like....you work so many hours on
> an image that I don't even want to see it for a few days <g>.
> Rob Gendler
> email: robgendler@att.net
> Web Site: http://www.robgendlerastropics.com
> ----- Original Message ----- 
> From: "Bobby Middleton" <bobm@koyote.com>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Friday, March 11, 2005 6:31 PM
> Subject: Re: [APML] OT: Deep M81 (12 Hours) (My image...really!)
>
>
> > Truley one of the best M81's I've seen Rob. What's the bright
semi-circle
> > loop with accompanying dark artifact on the right side of most stars
seen
> on
> > the high-res images?
> > Bobby Middleton
> >
> >
> > ----- Original Message ----- 
> > From: "Robert Gendler" <robgendler@worldnet.att.net>
> > To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> > Sent: Friday, March 11, 2005 5:40 AM
> > Subject: [APML] OT: Deep M81 (12 Hours) (My image...really!)
> >
> >
> > > Finally an image I can call my own <g>. This is a composite
> > > image of M81 with data from both my 12.5" RC and a small
> > > contribution from a 20" RC which I was trialing remotely at
> > > New Mexico Skies. Actually the 20" data made a very small
> > > contribution. The luminance is about 8 hours total and RGB about
> > > 4 hours. RGB and 6 hours of luminance from Connectuicut.
> > > http://www.robgendlerastropics.com/M81RCComposite.html
> > >
> > >
> > > Rob Gendler
> > > email: robgendler@att.net
> > > Web Site: http://www.robgendlerastropics.com
> > > _______________________________________________
> > > Astro-Photo mailing list
> > > Astro-Photo@seds.org
> > > http://seds.org/mailman/listinfo/astro-photo
> > >
> >
> >
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