Re: [APML] Image Processing Question: Gaussian Blur vs Unsharp Masking

["Stuart Heggie" <stuart.j.heggie@sympatico.ca>]

Chris, this is interesting. A couple of questions?

What settings do you use? I just tried it with these settings: Radius 3, Threshold 3.0, Quality
HIGH and Mode NORMAL. I liked the result.
How is this different from Gaussian Blur?

Stuart
----- Original Message -----
From: "Chris Schur" <comets133@yahoo.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Friday, November 05, 2004 1:13 PM
Subject: Re: [APML] Image Processing Question: Gaussian Blur vs Unsharp Masking


> Charles, another option that works remarkably well at
> removing grain but retaining all the detail in an
> image is the Smart Blur filter in PS.  Set just right,
> you can rid the grain, yet keep nebula detail.  Try
> it!
>
> Chris
> --- Charles Shahar <charles19@sympatico.ca> wrote:
>
> > Hi Everyone:
> >
> > I have an image processing question: I am getting
> > quite adept at pulling out faint nebulosity using
> > the curves and levels tools in Photoshop. The
> > problem, of course, is that these faint wisps of
> > nebulosity often have a "grainy" appearance to them.
> > Since I intend to print these images, and not
> > wanting to over-emphasize the grain, I am often
> > caught in a quandary over just how far to go when
> > pulling out these faint details.
> >
> > So I am using the Gaussian Blur tool to mask the
> > grain a bit. More specifically, I am using the
> > Adaptive Filter function in Iris, an image
> > processing program. This tool has a similar effect,
> > in that it blurs the object and masks the grain. But
> > now I am bothered by slightly blurry images. So I
> > have tried to use unsharp masking to compensate. But
> > this solution is only half-successful, because the
> > image starts to get grainy again.
> >
> > Does anyone have any solutions for this problem, or
> > should I just settle for the best balance between
> > grain and blur? Thanks for your insights,
> >
> > -Charles>
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