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Old 05-02-2012, 12:35 PM
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Rigel003 (Graeme)
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Rigel003 is offline
Join Date: May 2006
Location: Adelaide, South Australia
Posts: 1,041
It's a hard one as there's so much noise in the image. Not surprising with a 900 sec sub on a DSLR. It seems to have a fairly strong magenta cast overall too.

You could try using an inverse mask to preserve detail in the main nebula and then use the Replace Colour tool to select the noisy pixels in the background, then lower the saturation for these. Might need to do this step a couple of times selecting different shade pixels. While still using the mask you could also use the Reduce Noise filter to operate on the background. Here's an attempt along those lines.
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