Terry,
I tried this in similar conditions prior to Christmas and found the gradients in my image almost to difficult to smooth out and darken given it was swamped in Melbourne’s light glow. I used ‘Color Range’ to select the comet tail to enhance the far reaches and then tried to lower the exposure separately on the background by the same method. JA’s tip looks to be the way to go albeit sacrificing the fine tail tips.
Tough gig.
Anthony
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