Nice work there Doug! The Ha data really packs a punch, which has brought out some pleasing details. Histogram looks clean. Have you tried simply stretching the data using curves only. i.e. no levels to drop the white point prior to using curves. It may take quite a few iterations of curves, the levels to raise the black point, but you may just extract that little more from the data particularly in the shadows with out pushing the boundary of white clipping the highlights. DDP is good at see what potential the data has - give it a try so you know whats possible, then try achieve a similar result using curves. Hope to see you finish this one off with chrominance data - the FSQ is delivering the goods. Top stuff. Well done.
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