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Re: [APML] Winter Milky Way

Wei-Hao,

This is a fantastic work ... real piece of art! The scale of this
picture reveals all the beauty of the Hyades and Cr70 star clusters.

Thanks for sharing,

Philippe Chrétien
http://www.astrophoto.ca

----- 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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