Re: [APML] 10 frame Rosette Mosaic

["Mike Cook, AF9Y" <mwcook@concentric.net>]

Bobby,

   Outstanding job.  Just for kicks, I tried stretching your image in
PhotoShop to find the seams of the Mosaic.  To my surprise they
did not show up!  I can't recall a Mosaic that did not reveal the
seams when stretched.  Did you do something special with
background matching and boundary blurring?

Mike Cook
AF9Y


From:           	"Bobby Middleton" <bobm@koyote.com>
To:             	<astro-photo@seds.org>
Subject:        	[APML] 10 frame Rosette Mosaic
Date sent:      	Sun, 10 Feb 2002 13:15:04 -0600
Send reply to:  	astro-photo@seds.org

> Hello all. I've finally posted my "winter project" for this season. It's a
> 10 frame (yep; ten) mosaic of the Rosette nebula. I was able to oevrcome the
> frame warping difficulties that kept me from going past 5 or 6 frames on my
> previous projects by registering the central 3-4 frames with Registar on top
> of a wide-field image; then building the additional single frames on top of
> that. I still had some warping but I believe one can take the image at
> whatever stage and re-register it on a widefield image to get things back to
> linear alignment. It's here:
> http://www.koyote.com/users/bobm/rosette2.htm
> All 10 frames are composites of two 60 min exposures on hypered Kodak LE 400
> film.
> I posted a high-res crop of this to the AP users group about 2 weeks ago for
> comparison with CCD images made with two different wide-field instruments.
> The high-res central crop from my 12.5" f/7 newt is on the page below along
> with an identical crop from Ray Gralak's AP 105 st-8 Ha image and Mark
> Jenkin's Ha image from a 9.25" Mak-newt with a FLI CCD camera. Those
> comparisons are at the link below if anyone is interested in resolution
> comparisons of film and CCD cameras. The fewer stars from the CCD images are
> a result of the Ha filter.
> http://www.bigcigarastronomy.com/Rosette-Comparison2.jpg
> Bobby Middleton
> 
> 
> 
> 
> 
> 
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Mike Cook, AF9Y
http://www.af9y.com
mwcook@cris.com




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