Re: [APML] Winter Milky Way

["Marco Lorenzi" <lorenzi70@tiscali.it>]

Simply outstanding Wei-Hao, the best mosaic of the area I have ever seen in
my life!
Marco

----- Original Message -----
From: "Wei-Hao Wang" <whwang@asiaa.sinica.edu.tw>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Tuesday, January 13, 2004 2:30 AM
Subject: [APML] Winter Milky Way


> ALOHA,
>
> I finish the FIRST processing of my winter Milky Way mosaic.  I'm not
> too confident of the results.  Probably the best version still need
> a few more iterations.
>
> It's in
> http://www.ifa.hawaii.edu/~wang/gallery/picutres/WinterMilkWay2003.htm
>
> I had sent this picture to a Japanese magazine.  Let me
> copy the comments to the editors here:
>
> 1. This is a mosaic of 10 pictures.  Nine of them form the base 3X3
> mosaic.  An extra one centered at Orion was stacked onto the base
> to improve the signal-to-noise ratio of this region.
>
> 2. All 10 images were taken under excellent atmospheric transparency.
>
> 3. Vignetting pattern of the optics was removed by my own written
> program.  Distortion correction and initial color match were done in
> Registar.  Sky background removal, final color match, and mosaicing
> were done in PhotoShop.  Except for tone curve changes, no further
> image processing was applied.
>
> 4. Due to the light pollution, zodiacal light, and scattered car
> light, the sky background in each of the 10 frames is very different
> and nonuniform.  The vignetting correction and the removal of these
> unwanted lights are challenging.  I was worrying that some artificial
> feature (or in other words, "fake nebulas") will appear because of the
> inaccurate vignetting correction.  By comparing with previous pictures
> and the original slides, I believe some uncommon faint features in
> this picture are "real."  These include:
>   a) the wide and faint blue nebulas around M45 and above Alpha Tau.
>   b) the red north-south elongated nebula between Taurus and Eridanus,
>      which I believe to be Sh2-39.
>   c) a faint blue nebula to the right (west) of the Witch Head Nebula.
>   d) the color of the Milky Way between IC450 and the California Nebula
>      becomes a little green.
>
> Any comments are welcome.
>
> Because my monitor was broken a few days ago, I'm using a backup monitor
> which may not be well calibrated.  If you feel the color very
> uncomfortable, this might be the reason.
>
> Wei-Hao
>
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