Re: [APML] Irtis Nebula and M13 uploaded

[Alan Voetsch <alanv12952@yahoo.com>]

Hey Chris,

--- Chris Schur <comets133@yahoo.com> wrote:
> Alan, I finally figured it out, why your shots look a
> bit peculiar - the vignetting is causing a green
> center and purple outside.  You can see it best in the
> thumbnails.  You need to break the images into the
> individual RGB chanels, and remove the vignette
> individually, then recombine.

I can barely find images in PS, let alone do anti-vignetting. Can you
give me some specifics and I'll look into the procedure. Does Jerry
cover this on his site, or on the cd book? And yes, this is just the
kind of feedback I'm looking for.

I think this problem becomes quite noticeable on longer exposures. This
is well documented on the FSQ-106, but may be an issue here also. It's
also possible that the pick-off assmebly contributes to the effect, in
some cases. 

Thanks,
Alan




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