Re: [APML] Winter Milky Way

[Michael Cole <mrcole@earthlink.net>]

Wei-Hao,
Fantastic.  The colors and detail are excellent.  You are doing some fine, fine work.



Michael Cole
UrbanImager Astrophotography website
http://home.earthlink.net/~urbanimager/index.htm




Wei-Hao Wang wrote:

>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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>  
>

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