From: Milton Aupperle <milton@outcastsoft.com>
Date: March 26, 2007 11:11:28 AM MDT
To: Astro_IIDC@yahoogroups.com
Subject: Re: [Astro_IIDC] Saturn from the first hours of spring
Hi Alan;
Your comment on using fewer frames for stacking is something I'm also finds works really well too, especially if you have good seeing.
For example, I use between 30 and 40 frames out of 1000 to 1200 frames in each of the 21 movie for this lunar composite.
http://www.outcastsoft.com/AstroImages/Luna20070224MJA.jpg
About the only reason you want to stack a lot of frames is to help with noise suppression, because the more frames you stack, the more likely your blurring a previously sharp feature.
TTYL..
Milton J. Aupperle
President
ASC - Aupperle Services and Contracting
Mac Software (Drivers, Components and Application) Specialist
#1005 - 815 14th Avenue. S.W.
Calgary Alberta Canada T2R0N5
1-(403)-229-9456
www.outcastsoft.com
On 26-Mar-07, at 10:42 AM, Alan Friedman wrote:
Hi Phil -
Thanks very much for your note and thoughts.
The zen of astronomy in a place like Buffalo resides in the long stretches between clear skies and the even longer stretches between good seeing. There is lots of time to explore your data. The image is mostly done in that I don't think the unfiltered data will add much if any additional detail. I did get to spend some time with the image processing possibilities of Astro IIDC working on this and I found a nice work flow that is much more automated than my usual time consuming hand selection process. It seemed to work very accurately with data of this quality. I collected about 28,000 frames in 23 streams during the periods of good seeing last week. I was able to process it all while watching (with one eye) Casino Royale on TV with my family (a movie that looks just as good with one eye as two!.) My images are usually made from a small number of frames compared to many I see done in Registax with thousands of frames. I'm curious to see if improvements can be seen with the addition of more signal. I expect it will not change it very much.
best wishes -
Alan
On Mar 26, 2007, at 1:04 AM, Phil Houston wrote:
Alan,
If I were you, I would seriously consider saving time and just call your latest masterpiece finished. The image you have assembled shows much more than good equipment, good seeing, or good luck, it demonstrates an artistic skill that I find rare to this type of imaging. Very pleasing to the eye.
Phil
