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Gary, maybe this will work - not sure (and I'm no expert). Comes to mind
from an S&T article by Sean Walker on removing vignetting.
Copy your pic to a new layer in Photoshop. In the new layer use the stamp
tool to remove all the bright stars and because this is a Milky Way wide-angle,
you need to copy the darkest parts of the milky way onto the brightest parts
(you are trying to remove all the bright real data but preserve the general
pattern of the sky glow so my thought is that the darkest parts of the milky way
are just sky glow and so you want to use that stuff to erase the milky way.
Always use parts closest to the thing you are going to erase).
Then you should start experimenting with blurring from the filter menu. You
can blur it enough to have a mask that is basically a replica of the
skyglow pattern. Then in this layer you need to experiment with assigning the
blurred image to a mask setting and then play with the combine choices. I've
done this on a shot very similar to yours and it worked nicely. Kept most of the
signal and removed most of the skyglow.
To keep the trees, when you are ready to blur the pic, use the select tools
to select all but the trees and then blur the rest (or use the lasso tool if you
can't get PS to select all but the trees for you). Try selecting the shadows
then select invert from the main select menu.
I think.
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