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Re: [APML] Playing with SGBNR
Jason
Did you get a reply from Juan??
Ray Rochelle
----- Original Message -----
From: "Jason Ware" <jasonw@galaxyphoto.com>
To: <astro-photo@seds.org>
Sent: Monday, March 18, 2002 5:39 PM
Subject: Re: [APML] Playing with SGBNR
>
> Do you have any helpfull hints on picking parameters? You
> can learn by trial and error but that is time consuming.
> Any hints like "for images like _____ use a setting of ____"
> would be great.
>
> Thanks!
>
> Juan Conejero wrote:
> >
> > Jeff,
> >
> > Happy to see you're successfully using our software. I've taken the
> > freedom to reprocess your original M33 shot with SGBNR. I've found the
> > following set of parameters to substantially improve your image:
> >
> > Channel-specific Parameters
> > Radius = 1.50 for all the R, G, B channels
> > Histogram midtones = 0.500 for all the R, G, B channels
> > Histogram shadows and highlights set up through global
> > auto-levels
> >
> > Global Mask Parameters
> > Blur mask disabled
> > Auto-All Levels
> > Shadows clip = 0.005
> > Highlights clip = 0.700
> >
> > Global Filter Parameters
> > order = 0.50
> > truncation = 0.001
> > (matrix size is 35 for all the R, G, B channels)
> >
> > Edges Protection
> > Threshold = 0.190
> > Overdrive = none (0)
> >
> > I've tried SGBNR on your "Before SGBNR" JPEG image. If you work with a
> > significatively greater image you'll probably need to increase the
> > filter radius value, as well as to enable mask blurring. Maybe you'll
> > need also to use a slightly different filter order. Let us know how it
> > goes.
> >
> > Don't worry too much if SGBNR warns when you open certain TIFF files.
> > The libtiff library is extremely rigorous (that's one of the reasons
> > for which we use it) with the TIFF format and some programs generate
> > improperly constructed TIFF files.
> >
> > Best regards,
> > ______________________________________
> > Juan Conejero, Pleiades Astrophoto Lab
> > skycad@ctv.es
> > http://www.pleiades-astrophoto.com/en.html
> >
> > At 21:46 16/03/2002 -0500, you wrote:
> >
> > > Hey all,
> > > Rain here in the Ohio Valley:-( I have been playing with some
> > > software
> > > today and printing images. I must say, I am impressed with SGBNR.
> > > I
> > > have found Neat Image gives me some very odd green boogers.
> > > Sometimes
> > > it is green stars, but other times it is green streaks. Small, but
> > > there nonetheless. At first, I thought Neat Image was working
> > > better
> > > for me than SGBNR. But as usual, it was operator error. After
> > > walking
> > > through the guide/help one time, I think I have a little better
> > > handle
> > > on the software. I cranked up the noise on an M33 shot to see how
> > > SBBNR
> > > could clean it up. It is still a little bit over the edge, but I
> > > think
> > > SGBNR did a great job on it. I mainly went with auto settings. I
> > > think
> > > I increased the radius in the red channel a bit. I did not use any
> > > overdrive. Sorry for the large files. I am getting some value
> > > errors
> > > when opening .tif files. Again, probably operator error. Something
> > > about a value of 1 and the software expecting a value of 3. I am
> > > sure
> > > it will be worked out on my end. I used .bmp files to start and
> > > saved
> > > into .tif.
> > > Jeff
> > >
> > > Before SGBNR
> > >
> > > http://www.astro-photography.com/M33_grain.htm
> > >
> > > After
> > >
> > > http://www.astro-photography.com/M33_new.htm
> > >
> > > Jeff Ball
> > > www.astro-photography.com
> > > Ohio Valley Astronomical Society
> > > www.ovas.org
> > >
> > >
> > > -- APML Archives at <http://astro.umsystem.edu/apml/> ---
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> >
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> --
> -Jason Ware
>
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