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Hi Malcolm,
Hope you don't mind but as part of my learning process I downloaded your shot and had a play with it in CS6.
I was able to pretty much get rid of the magenta halos in three processes. First in 'Lens Correction' and then in Camera Raw and Selective Colour. Fiddly, but it seemed to get the desired result.
Being very new to this genre I googled NGC 3372 to get an idea of what it's overall appearance looked like. Wow, I know each shot will be different because of seeing variance and post processing, but it seemed like every colour of the rainbow was deemed as the dominant colour.
Other than the halos I found almost no red in the shot so I will be interested to see how your further Ha integration goes.
Oh, and if I sound even vaguely like I know what I'm talking about, I don't.
Cheers
Kev
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