RE: [APML] NGC7000 / Cygnus area

["Arne Danielsen" <arnedani@online.no>]

John,

> -----Original Message-----
> From: John Boudreau [mailto:jeboud@comcast.net]
> Sent: 7. november 2003 00:24
> To: Arne Danielsen; Discussion of FilmAstrophotography
> Subject: Re: [APML] NGC7000 / Cygnus area
> 
> Fine work Arne, both Geir and yourself!

Thank you very much!

> 
> I particularly like the high/low contrast selection idea on the film
> image. That's neat!

Well, I wasn't sure which alternative I liked best so I decided to
publish both. Glad you liked it!

> 
> On the 10D image, to my eye there appears to be an overemphasis on
faint
> nebulosity. Looking at the black point of the histogram, the green is
> chopped off just a bit, and the blue is chopped off _very_
aggressively.
> The red channel is fine, but it's blackpoint along with that of the
green
> and blue blackpoints are causing what is a strong artificial red cast
to
> the background that looks like faint nebulosity. For instance, even
very
> deep cooled CCD exposures don't show much faint red nebulosity in the
> "Gulf" region.

Thank you very much for the detailed feedback and advice. I find it
difficult to find the right color balance and amount of stretching. I
will have another go on the processing and see if I can address the
issues you pointed out. That will however have to wait until next week
as I have a total eclipse of the Moon to attend to this weekend! :-)

> 
> John
> 
> John Boudreau
> http://home.comcast.net/~jeboud/astro.htm
> 

Take care,
Arne
--
Arne Danielsen
Langhussenter 15, 1405 Langhus, 
Norway mailto:arne.danielsen@oslo.online.no
http://arnedani.home.online.no/
N59°45'14" E10°50'38" A115m




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