Halos like in this image...
Thank you so much!

Richard
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workflow
1- identify the offending halo star
2- make a circle of the entire star and halo (fig 2) 3- make a smaller circle within the green circle for the white part of the star. The mask will be erased over the star
4- Open the color module, select keep mask, tune down the blue and possibly red until you have a good mix of background color. 5- Bright sat should be down to 0 and dark sat up to 50 or more... 6- save your work