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Hi Gary
That is a very nice image - looks stunning to see M83 just hanging there in space. Your black point may be too severe; I think its called histogram clipping? Basically, if you chose a point on the histogram to call black, anything less than this becomes black. So, dark grays will become black and it's here where you may have clipped the data.
Not a big issue, but something to consider.
Cheers
Dennis
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