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

[Chris Schur <comets133@yahoo.com>]

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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