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Number one: it's black clipped, and quite harshly. Using your PNG on astrobin, I managed to extract the image below, but I could likely get more if it was not black clipped. (resampled at LOW res, hence the poor quality)
Secondly, green is...well...yak for DSO's - most astrophotographers go out of their way to remove green from images (there are green removing scripts for photoshop and PixInsight). You'd be better served converting it to the Hubble Palette.
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