Re: [APML] Tricolor Image to Work With

["Bobby Middleton" <bobm@koyote.com>]

You guys get some nasty halos with those expensive refractors <g>. If
someone will give me some hints on getting rid of them then I'll march on
with this work Chuck has assigned us. I know it will involve a mask of some
kind but I'm just too green to figure it out yet. I tried an inverted blur
from the blue channel but it didn't make any diference (if I did all the
steps right??)
Bobby Middleton



----- Original Message -----
From: Chuck Vaughn <aa6g@aa6g.org>
To: <astro-photo@seds.org>
Sent: Thursday, February 01, 2001 11:41 PM
Subject: [APML] Tricolor Image to Work With


> List,
>
> Since we seem to be into this right now, I've posted RGB
> grayscale images of SH2-157 that are ready to be put
> together into a tricolor image. This is a faint and not very
> spectacular nebula that I photographed over two years ago.
> It is not on my web site. If you'd like to experiement with
> it you can download the parts here. Each is about 1.1MB.
>
> ftp://shell3.ba.best.com/web2/aa6g/red.tif
>
> ftp://shell3.ba.best.com/web2/aa6g/green.tif
>
> ftp://shell3.ba.best.com/web2/aa6g/blue.tif
>
> The only processing done was in the prescan to get the
> blue and green channels scaled to match the red and equal
> contrast stretch in each channel to get the most out of my
> scanner. The images were aligned in Photoshop but no
> processing was done there except to eliminate a few dust
> specs.
>
> I put the image together and did a single Curves adjustment.
>
> ftp://shell3.ba.best.com/web2/aa6g/sh2_157.jpg  (340KB)
>
> Maybe you can reduce the blue halos, reduce grain and even
> out the background which becomes a problem as you stretch
> this faint nebula.
>
> Warning: My web site has limited daily download. If it's
> exceded a message will probably pop up. I get whatever
> download amount was used 24 hours ago back at the top of
> each hour so try then.
>
> Have fun,
>
> Chuck <aa6g@aa6g.org>
>
>
>
>
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