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That last rgb version is much better, it's the type of detail in the nebulosity that made me ask before, a minimum filter whilst shrinking stars also makes other detail " clump" together, M17 is particularly difficult in that it has wavefronts all through the nebulosity, and using a minimum filter causes a spiderweb like appearance. Some tools such as carboni's make stars smaller incorporate a minimum filter within, and it's applied across the image.
As I said, this version is much better, and it's not just to do with the stars.
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