[APML] New image of IC 1805

[Alan Brent Jordan <aljordan@gwi.net>]

Hello,

During the three beautiful nights we had in Maine last weekend, I was
able to take two poorly framed 90 minute exposures of IC 1805 in
Casseopia.  These again were taken with a Takahashi FS-102 at F6 with an
IDAS LPS filter on Kodak Supra 400.  The sky was not quite as
transparent during the night I took these compaired to the remaining two
nights, and maybe that was why this one seemed very difficult to extract
the information off of the nagative.  The two 90 minute exposures were
stacked in Picture Window then processed in Photoshop.

The scans came out extremely dark with only the dark point set during
pre-scan.  When I tried to change the levels to bring out the
nebulousity, I wound up blowing out the background grain way too much,
so in my attempt to figure out Photoshop I tried something new which
worked pretty well.  When looking at the three different red, green and
blue channels, I noticed that the red channel was the only one to
contain any detail in the nebulousity.  With that in mind, I selected
the sky background and ran a mild gaussian blur first in the blue
channel and then in the green channel, keeping the red channel intact so
the detail in the nebulousity would not get screwed up.

There is a problem with a bad antivignetting layer I put on which caused
some bad color shift, but I will fix that as I have time.  The picture
is at:

http://home.gwi.net/~aljordan/astro/heart.html

Alan


-- 
Alan Jordan
aljordan@gwi.net
http://www.gwi.net/~aljordan

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