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gday gary.
that is a ripper of an image, and youve only used a 6 inch scope it has the detail of at least a 10 inch so its seriously good.
As for colour consider this, when people put up m20 its pink yet with other Ha emissions they suddenly become red, i think its a bit like coffee just add sugar to taste, some like it sweet some dont, not only that but all monitors are different unless you have a calibration setup, i personally think when we process images we do it in a way that promotes what we think is there or should be there rather than just enhancing what we have captured... (a large discussion on blue nebs was done a little while ago and although they were blue that was the color of the oxygen emissions and was accurate, it just didnt get the redder Ha emmissions).
Ask yourself are the stars all blue perhaps, could there be large amounts of oxygen, is it blue shifted from movement.... i dont know for sure, just give yourself an image you like, theres no such thing as a perfect image, you can fault them all if you look hard enough.... one day when the james web scope is up we will look at hubble shots and go ..puh... not enough detail.
i am always amazed at the detail you can squeeze out of that scope.
cheers clive.
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