I just used that same procedure (once I worked out how you apply the mask, a step left out in the tutorial (set working mode to overlay)
I found it seemed to wash out saturation generally in the image. Perhaps that is a refinement needed in the settings.
On the other hand I spent 1 minute in Photoshop, made a star mask, lowered curves, then made a mask from the star selection, inverted it and boosted the nebulas (not the stars) with curves and got a 500% better result. Time - 2 minutes.
Greg.
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