Re: [APML] New Image: NGC 7331

["Robert Gendler" <robgendler@worldnet.att.net>]

Hi Chuck,
Yes I noticed that too. I was surprised as the data is very good
and the composite was smooth as silk. I suppose the more the
data gets processed the more noise becomes apparent in each 
channel. I assume the composite RGB offsets the noise in each 
channel to a certain extent. The trick is to quit before the noise 
reaches the level of perception in the final RGB composite <g>. 

Rob Gendler
email: robgendler@att.net
Web Site: http://www.robgendlerastropics.com
----- Original Message ----- 
From: "Chuck Vaughn" <aa6g@aa6g.org>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Saturday, August 06, 2005 2:34 PM
Subject: Re: [APML] New Image: NGC 7331


> Rob,
> 
> Awesome, just a killer image!
> 
> I have a question. This is not a criticism in any way, I'm just  
> trying to understand what is going on since I'm getting my first  
> experiences with digital imaging with a Canon 20Da.
> 
> I've noticed in my first images and in your NGC 7331 that when you  
> look at the gray channels there's a noticeable mottling in the red  
> and blue channels and much less in the green channel. I'm seeing the  
> same thing in my images. It seems to have something to do with S/N as  
> it shows up most in the lower levels.
> 
> Any insight?
> 
> Chuck
> 
> -----------------------------
> 
> 
> 
> > Hi all,
> > Here's a new image of the NGC 7331 field. The transparent skies
> > helped most of all with the color which is generally weak for this
> > galaxy. Make sure to scroll the large image for the myriad of
> > background galaxies. Also a write up on this galaxy is below.
> > http://www.robgendlerastropics.com/NGC7331NM.html
> 
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