Re: [APML] Grain Reduction?

[<cschur@cybertrails.com>]

Alen, Ive tried plenty of experimentation in grain or CCD noise reduction,
and because I like to stretch the low end in even deep exposures to the
limits I deal with unwanted noise this way, for film shots where you are
dealing with the random and quite chunky silver halide granules SGBNR has
always superceeded all other programs in cleaning up the image.  For CCD
work, the noise is smaller, pointlike and more evenly distributed.  A
program called NEAT works best here.  One of the worst programs Ive tried
in recent times is a photoshop plugin called "grain surgery" which leaves
artifacts all over astro images.  There is also something callled NIK
grain reduction or something that I havent tried yet.

Chris Schur

> What is the best was to minimize grain in single
> exposures? (I don't yet have multiple shots to
> composite.) When I play with the transfer curves to
> try to bring out faint detail, the grain comes up
> along for the ride. Is SGBNR what I need, and if so,
> any tips for how and when to use it? For instance,
> do I apply it at the very end, after all the other
> processing steps? Or near the beginning, before
> I've amplified the grain (noise)?
>
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