Re: [APML] Winter Milky Way

["Keith Geary" <keithg1@eircom.net>]

Wei-Hao, what a superb shot!, I love the way those red nebulae are so
distinct! Keep up the good work,
Keith...

> > ----- Original Message -----
> > From: "Wei-Hao Wang" <whwang@asiaa.sinica.edu.tw>
> > To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> > Sent: Monday, January 12, 2004 8:30 PM
> > 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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