This process gives you a quick and relatively simple way to reduce the halo which sometimes appears around some brighter stars - In my experience this can happen with the L-eXtreme filter. This process just makes the amazing images produced by that filter a little bit better!
The credit for this process needs to go to Kurt at AstroQuest1 - I just tweaked the process a little. You can see his original video here: • Simple Method for Removing Star Halos in PS