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Thanks Alchemy, I think I lost the other 2 colour channels with my first attempt at setting the black point. I've been experimenting with multiple points in curves - concentrating the black end and I think this has helped to keep the stars sharper.
Now I have another processing question - why do some imaging processing applications flip the image? I haven't worked out who is the culprit yet (or which way is up) but I have noticed this with some of my images including this one.
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