Re: [APML] 10 frame Rosette Mosaic

["Bobby Middleton" <bobm@koyote.com>]

----- Original Message -----
From: "Mike Cook, AF9Y" <mwcook@concentric.net>
>    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?

Thanks Mike. Yes I earned my money on hiding the seams. I overlayed the new
frames to the core image in Registar, then took them back to Photoshop for
tonal and color adjustments (including selective adjustments). Then I'd
re-try and re-adjust until the frames were close enough. But final seam
removal usually involves at least a little clone tool use; sometimes more
than a little.
Hardest part of mosaic work is fixing the dark corners due to vignetting. I
have a Taurus camera with machined parafocal adaptor ready to try, but I
didn't use it any on this project because it wasn't ready yet. I am hoping
the Taurus camera will be an improvement for the vignetting, but it may
require a 2.7" focuser and 2.7" OAG to really help.
Bobby


>
>
> 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
> >
> >
> >
> >
> >
> >
> > --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
> >              Unsubscribe at <majordomo@seds.org>
> >
>
>
>
> Mike Cook, AF9Y
> http://www.af9y.com
> mwcook@cris.com
>
>
>
>
> --  APML Archives at <http://astro.umsystem.edu/apml/>  ---
>              Unsubscribe at <majordomo@seds.org>


--  APML Archives at <http://astro.umsystem.edu/apml/>  ---
             Unsubscribe at <majordomo@seds.org>