The Western Veil (NGC 6960)
exposure time for Ha was 60' as previously described (binned 1 x
1). Exposure times for R, G, B were 18' each (binned 2 x 2).
Date for color data: June 20, 2004
Sky 90 at f4.5 with field flattener/focal reducer, on the G11 Losmandy
Autoguider: SBIG STV with
RGB type II filter set.
Exposures: 6 x 3' each color
filter, binned 2 x 2.
Conditions: Temperature 50 degrees F; above average
transparency; below average seeing; breezy.
Post-processing: Color data:
No dark, bias, or flat frames used. Each color channel
MaximDL and sigma combined using RC Sigma Reject plug in. The
images were then normalized manually in ImagesPlus, RGB combined, and
DDP stretched to a yield a reasonable color read out. Gradients
were corrected in this RGB image by splitting into R, G, and B
channels, followed by use of the Background Compensation feature of
ImagesPlus (IP) on each channel. Gradient-corrected channels were then
recombined, and the RGB image was moved into Photoshop for merging with
my hydrogen alpha
as luminance. An HaR combine (50:50) was used for the red
channel. The technique of "Luminance
Corrected LRGB" was used to preserve luminance detail and color
the green-blue tendrils representing areas of OIII emission in the
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