Re: [APML] Southern Milky Way mosaic

["D. Kodama" <kodama@alumni.caltech.edu>]

Thanks everyone for the compliments!

Wei-Hao,  I had an easy case with this one.  Because of the excellent
site, I had no sky background gradient to fix.  Also because the Borg
100ED and Planet Town camera combo, I had no vignetting to fix either.

To answer Scott's question, I first balanced the color of each frame as
closely as I could in Photoshop in 16-bit mode.  I then registered the
frames using Registar.  After that I combined them in Photoshop (8-bit
mode), doing very minor color tweaks and feathering frame edges.  So the
answer is that I only used Registar to align the frames.

As for going south again, certainly I'd like to do that but I don't have
any definite plans at the moment.  I actually did not plan to create a
mosaic until I was nearly done with my shots.  Consequently I didn't get
proper coverage and I ended up cropping more off than I would have liked
to get a rectangular image.  For this mosaic I used 5 frames + 2
additional frames which served only to fill in some narrow gaps in the
primary 5 frames.

Dave




> Hi Dave,
>
> This is a beautiful image!
>
> I always hope to see more mosaic images.  However, especially for
> film mosaic, flat fielding is a big problem.  Could you share with us
> your flat fielding (or anti-vignetting, whatever) technique?
>
> Do you plan to go to the south in the future to expand this mosaic?
>
> Cheerss
> Wei-Hao
>
> --
> ________________________________________________________________
> Wei-Hao Wang  :)
>
> Institute for Astronomy at University of Hawaii
>
> Address:
> 2680 Woodlawn Drive         Personal Website:
> Honolulu, HI 96822             http://www.ifa.hawaii.edu/~wang
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