RE: [APML] Astronomy Magazine M8

["Mike Cook, AF9Y" <mwcook@concentric.net>]

     This is a typical CCD image where all the star color information
has been lost in the clipping and reduction to 8 bit/channel color.
Unless steps are taken early in the process to preserve the small
color variations of the stars, they all end up as white.

     Of course, I'm not telling you anything; you wrote the book
(well, tech paper anyway) on star colors:

http://home.att.net/~thor.olson/papers/StarColors.pdf




>From:           	Thor Olson <Thor.Olson@EFI.COM>
>
> > Looks like they might have pulled down the wrong image... 
> > this is more what we
> > expect at http://www.noao.edu/image_gallery/html/im0042.html 
> 
> Does anyone else find it interesting that in this traditional
> red rendition of the nebula that there are no blue stars in the field?
> 
> I'm not familiar with the star population here, but I would be
> surprised if they were ALL 6500 degrees or less!
> 
> 
> 
> Thor Olson                            
> EFI-Minnesota                 email: mailto:thor.olson@efi.com
> web-res astrophotos at:       http://home.att.net/~nightscapes
> 
>    "Man has ten, computers have two, Nature has e fingers."
> 
> 



Mike Cook, AF9Y
http://www.webcom.com/af9y
mwcook@cris.com




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