Thanks everyone for the comments and compliments.
Quote:
Originally Posted by Placidus
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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Thanks Mike for the comments. There are certainly a number of ways to approach the problem of star colour in NB. Martin Pugh told me a detailed method he uses at a Malin awards quite a few years ago but I have forgotten his method. It did not involve any process I have read but it I think it does use the colour match tool. His star colours are very consistent. It means not having to collect RGB.