[APML] Processing comet

["Hrvoje Posilovic" <hrvoje.posilovic@mail.inet.hr>]

	Dear APML List this is my first posting to the list, and first I will like to apologize because of my bad english, but hope that you will understand me.
For some time  reading yours discussions and looking beautiful images of the sky. And so decided to try mysef, a couple weeks ago I photographed the Ikeya-Zhang comet with 250 mm lens mounted on the small scope.
At the night of photographing there was a very thin red glowing cloud in the front of the comet. And here starting my problems, after printing photographs
there is terrible red "mist" all over the photography. The comet is very bright and with long tail.I scanned the photo and tryed to remove red "mist" in photoshop.First I completely deleted red channel and that significant improve
 the image, but there is also some artifacts in blue and green channel. That blue and green artifacts is impossible to remove without affecting comet tail.
	I thinking about that problem and concluded following : the "mist"
pixels are randomly distributed in the image, but pixels that belong to the comet tail are distributed in some linear trend. 
I wonder is it possible to separate randomly and linear trended pixels and in similar way to clean the comet tail of the "mist".
	I will like to improve that image if is possible, becouse that is my first image of the sky and I like it.

I will appreciate any  help.

Best Regards
Hrvoje Posilovic
from Croatia
 



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