Quote:
Originally Posted by Jeff
Still flicking my way through Jim's PixInsight Cribsheet ... up to page 5.  
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Not sure if it's in the cribsheet but here's something to try, Jeff. Apply a star mask, then use ColorSaturation with a curve that especially favours the blues (you'll probably want to drop it down near zero in the red and magenta.) I reckon you've got some blue stars that will pop out nicely.