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I've been using the minimum filter in Morphological Transformation with circle as the structure for star reduction (in conjunction with a mask that only exposes the stars). Would the median filter be a better choice for this? I am usually quite careful with this step, but in an effort to make the nebulosity stand out I may have pushed it too far.
Got it about the Luminance and Ha blends with red as well. The Ha as luminance can do it as well. I haven't really explored Ha blended with luminance and also with red. I should. Other ways are more flexible but perhaps a different result. Its worth exploring all the different ways and decide which approach you like the best.
I've had mixed results with this tool. At one point I thought I had it under control. But yes that is how I have used it. What I do notice is that whilst it can make an improvement to the star shapes it often damaged the main image. So a star mask would seem vital. Reducing the settings minimised that but not entirely. So becoming adept at doing a PI Star mask would seem to be important.
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