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Had a play in GIMP. Not brilliant but gives an idea of what can be done by selecting individual RGB curves. A big curve to brighten. A blurred mask and then sharpen. An S curve for contrast and Sharpen. I use Pixinsight so not very much help with PS. Quality is lousy due jpeg etc etc but the colour is looking a little better. Noted the ringing around the stars probably due to sharpen.
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