Re: [APML] Alternative Anti-Vignetting Photoshop Technique

[tomdiana <tomdiana@acegroup.cc>]

Jeff,

Great image!  I'm glad this technique worked out for you.  I do still notice
some green hue around the Veil.  You should be able to create a smoother
blend with little difficulty.  Maybe you could adjust the color of the fill
layer for a better match and then make an overall adjustment of your
background with Curves.  You could also modify the boundaries of the layer
mask.  Try a Gaussian Blur (as Tony Hallas suggested in an earlier post).
In any case, I like what you've got for your first attempt.

Tony (et al.),  I was just thinking about why the Lasso tool would not be as
viable an option to Color Range for creating the layer mask.  Using Color
Range allows you to make a more accurate mask, one that would not affect
nebulosity or stars within the vignetted region of the image (especially HII
nebulosity).  The Lasso equally selects everything within its range.

Tom

----- Original Message -----
From: "Jeff Ball" <jeffball@netacs.net>
To: <astro-photo@seds.org>
Sent: Monday, January 07, 2002 12:44 PM
Subject: RE: [APML] Alternative Anti-Vignetting Photoshop Technique


> Hello Tom,
> Thanks for the av procedure.  I tried it on an image that had uneven
> illumination in the corners.  That is my main problem.  It helped
> tremendously.  I am still learning how to maximize the procedure, but
early
> results look good.  Thanks for passing along.  I need simple directions in
> PS.  Here is the first image I have worked with.
>
> http://www.astro-photography.com/cirrus.htm
>
> Jeff Ball
> www.astro-photography.com
> Ohio Valley Astronomical Society
> www.ovas.org
>
>
> -----Original Message-----
> From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> Behalf Of T&JDiana
> Sent: Monday, January 07, 2002 2:00 AM
> To: astro-photo@seds.org
> Subject: [APML] Alternative Anti-Vignetting Photoshop Technique
>
>
> Greetings all,
>
> I have decided to rejoin the list after nearly a year hiatus.  I have been
> experimenting with different techniques to correct for vignetting and
wanted
> to share one with you.  I would appreciate any feedback.
>
> http://www.astronomyphotos.com/PhotoshopTechniques2.htm
>
> Thanks much,
> Tom
>
>
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