RE: [APML] Building M31

["Lane, Jason R" <jason.lane@navy.mil>]

Hey Alan,

I think when you combine exposures of different times, you want to weight them according to the exposure times?  I'm not sure, but this seems to make sense.  In Photoshop, if you were bringing them all into an image as different levels, then the shortest exposure times would have the lowest opacity.  Does this make sense?  I think Jerry has a blurb on this in his photoshop CD-book, if you own a copy of it.

-Jason

-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Alan Voetsch
Sent: Sunday, October 31, 2004 4:43 PM
To: APML
Subject: [APML] Building M31 


Hi all,

In early October, I took several shots of M31 over 3 different nights.
The camera orientation didn't change as the shots were all sequential.
I am just now getting around to working with them. There are exposures
of the following lengths: 30, 35, 50 80, 80, 90, and 120 minutes. They
are all on E200. I hope to bring them into Registar for combining. But
am wondering what combos to work with. Should I combine the shots that
are closest to each other, then combine those combines together, later?
I'd appreciate any suggestions before I screw up and drive myself nuts.

Thanks,
Alan

=====
SCT Astrophotography: http://www.pbase.com/avoetsch/astrophotography
FS-102 G-11/Gemini: http://www.pbase.com/avoetsch12952/tak_fs102
& http://www.pbase.com/avoetsch12952/fs102


		
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