RE: [APML] Zapping moonlight glow with PS

["Richard Klappal" <klappal@xnet.com>]

Emmanuele:
	Make a duplicate layer; gaussian blur the dup until there is no detail,
just a homogeneous field; then experiment with 'subtract', or 'screen'.
Finally stretch the histogram and play with Curves.

I've made this work on occasion, and also made a terrible mess!  Always
preserve your original somewhere else!

Jerry Lodriguss may have a cleanly explained procedure on his website.

> -----Original Message-----
> From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> Behalf Of Emmanuele Sordini
> Sent: Monday, April 01, 2002 17:10
> To: astro-photo@seds.org
> Subject: [APML] Zapping moonlight glow with PS
>
>
> Hi all,
> last week I took some nice shots of comet I-Z with a 200 mm
> telephoto lens
> and E200 film, where the comet shows off a tail about 4.5° long (as
> measured on the frame).
> In spite of the exceptional sky transparency due to a very dry
> (down to 15%
> RH!) NW windstream, moonlight inevitably shed all over the
> pictures, making
> the comet's tail less noticeable.
>
> Anybody know of any digital trick (Photoshop and the like) to dim the
> moonglow, darken the background and theregfore make the wispy
> comet's tail
> stand out?
>
> Thanks in advance,
> Emmanuele Sordini
>
>
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