From: "Tim" <tjp314@pacbell.net>

Date: November 1, 2007 1:02:50 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: Comet Holmes Oct 30 from Toronto

Say what???

NO!  would be my vote, if there's an election...

Doesn't this problem sound like simple addition verses averaging

having been selected as the staking method?  I get my best results

from averaging.  Summing the images brightens the scene but sums the

noise as well.

-Tim.

--- In Astro_IIDC@yahoogroups.com, Milton Aupperle <milton@...> wrote:

Well maybe I'll just give up on stacking then.

On 31-Oct-07, at 12:38 PM, jimchung2338 wrote:

Hi Alan,

First off, a colleague was kind enough to remind me that I should  

have stacked the images on

the nucleus and not the star field which is why I'm getting all  

these interesting colors.

http://tech.groups.yahoo.com/group/Astro_IIDC/files/Planetary/ 

Holmes_FleaRGBrestack.jpg

It didn't really clear until after 11 PM last night so the object  

was near the zenith and my

polar alignment wasn't good enough to image more than 5 seconds at  

a time.

I've been using Nebulosity (sorry Milton) to proces subs and it  

performs a combination of

straight summation and averaging during the stack such that  

oversaturation of a pixel will

not occur.

Jim

Milton J. Aupperle

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Mac Software (Drivers, Components and Application) Specialist

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milton@...

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