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Troy,
I tried your process icon on my M17 data and it did a good job on the stars but had trouble with the bright nebulosity (maybe I should have killed the CIEL() subexpr). See attached before and after images. Still a very cool demonstration of the power of PixelMath!
Here's a quick & dirty expression that creates a magenta mask that works for my M17: "CIEa($T)>0.62&&CIEb($T)<0.59".
Mostly I use the ColorSaturation process to kill my magenta fringes. Another great tool is ColorRange from Carlos Milovic. It allows you to define a range of colours in a selectable colour space (RGB, CIELAB, etc.) and then builds a mask that selects those colours in an image.
Cheers,
Rick.
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