Re: [APML] IC1805/48, Pleiades and Witch Head

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

Great stuff Axel!
On some of my mosaic work I overlay the images and cut them right at the
seem. Then I can go back and stitch together the cut image with the other
original image. I use this when uneven illumination from the edge areas that
overlap get too difficult to even out brightness and background levels. It
eliminates the overlaps.
Bobby Middleton


From: Axel Mellinger <axm2@canopus.physik.uni-potsdam.de>

> Hi all,
>
> I have three new images on my web site:
>
> - a mosaic of IC 1805 (the "Running Dog Nebula") and IC 1848
> - a 3 image stack of the Pleiades
> - and a 3 image mosaic/stack of the Witch Head nebula (this one
>   seems to have become a very popular target recently - I hope you
>   did not get bored yet ;-) )
>
> The Witch Head was a special problem, since I had 3 exposures with
> a partial overlap. Traditional stacking in Photoshop, GIMP, or
> similar programs would have left me with an image showing only the
> part covered by all three exposures, while stitching (essentially
> cutting and pasting the individual images with feathered edges) would not
> have averaged the images in the region where they overlap.
> I ended up writing my own software to do this task.
> How are you other APML'ers doing this - stitching and stacking at the
> same time?
>
>
> Here are the direct links:
>
>
http://canopus.physik.uni-potsdam.de/~axm/photo.cgi?Image=images/ic1805_2001
_s
>
http://canopus.physik.uni-potsdam.de/~axm/photo.cgi?Image=images/pleiades200
1_s
>
http://canopus.physik.uni-potsdam.de/~axm/photo.cgi?Image=images/witchhead_s
>
>
> Clear skies,
>
> Axel
>
>
>
>
> --
> Axel Mellinger  <http://canopus.physik.uni-potsdam.de/~axm/astrophot.html>
>
>
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