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I'm a newbie at Image processing, but it seems to me that your fringes
are due to over saturation of colour. You don't actually have blue haloes; you have haloes of whatever colour the star in question happens to be.
For example, the yellowish stars have yellowish haloes, and the blue ones have blue ones. Also this is indicated by the bulb like centre of the nebula
being much too strongly coloured.
raymo
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