The image was scanned at 48bit color, Scanning Quality: Best,
Resolution: 3200dpi, all the adjustments were disabled. I did adjust the
R,G,B black points in the histogram manually in the scanner software before
scanning the image. I resized the image in PS and converted it to jpeg.
No other processing was performed. With a large enough mag I can see some
color noise in the black background but with SGBNR (using the default
settings), noise reduction software it is easily removed. But at this image
scale I didn't think it was necessary to apply it.
In
the above image I could see elongated white halos around the stars. I
rescanned the image, this time I also reduced the white point in the R,G,B
histogram to reduce the halos, it also made the background less
brown. I also performed final adjustment in PS and cropped out some of
the field rotation in the lower right corner. It seems to have made a
difference. What do you think?
www.starfillednights.com/image_data/M27_image_data.htm