Re: [APML] M33 TV-85, ST2000XM

["Bert Katzung" <katzung1@comcast.net>]

Hi Dave:
I think I may have a clue. The red and the L frames have been stretched so
that their histograms cover the whole 0 to 65000 range of brightness. If
that was done before the color combine, it would completely throw off the
weighting. Could that be what happened? When you do the combine you must use
unstretched masters. Do the stretching after you have done the color
combine.
Bert

Bert Katzung
katzung1@comcast.net
www.astronomy-images.com

----- Original Message ----- 
From: "Dave Manifold" <dave@davidmanifold.com>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Monday, September 22, 2003 5:13 PM
Subject: Re: [APML] M33 TV-85, ST2000XM


> Hi Bert,
>     Here are the individual stacks.  They are huge, and also flawed.
Maybe
> I did use the wrong filter for the L.  Would you be able to tell by
looking
> at these images?
>
> L =  http://www.davidmanifold.com/L-Combine18.fit
>
> R =  http://www.davidmanifold.com/R-Combine7MXDLgama1.fit
>
> G =  http://www.davidmanifold.com/G-Combine4gama1.fit
>
> B =  http://www.davidmanifold.com/B-Combine6MXDLgama1.fit
>
> Dave...
>
>
>
>
>
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