Re: [APML] Playing with SGBNR

[Jason Ware <jasonw@galaxyphoto.com>]

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
> >
> >
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 -Jason Ware 

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