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Paul, I cannot even begin to say how seriously good that image is. The thing that is most striking is the incredible contrast in the bright nebulosity. Very well done.
I've thought a lot about how to use NB data to "guess" what the natural colour of the star might have been. Just thinking of the physics, the only meaningful information we have is an estimate of red to blue: (Ha + SII) / OIII. So one physically meaningful approach would be to map high ratios to red, low ratios to blue, and middling ratios to orange, yellow, and white.
I would imagine that the way to proceed would be to:
(a) Go starless, or at least approximately so.
(b) Separately, on the linearly and equally stretched original image, come up with a set of star colours as described above.
(c) Drop the star colours onto the starless image, using "lighten" mode.
Working on it!
Once again, that is a completely stunning image, most especially in terms of the skilful use of high contrast in the nebulosity.
Best,
Mike
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