[skysurfer]

Originally Posted by Geoff45

Have you tried Gradient Exterminator http://www.rc-astro.com/resources/GradientXTerminator/
It’s a photoshop plugin that works pretty well.
What happened to the stars? The bright ones have rings around them.

I used purple fringing correction to correct the blue halos, but I used it too strongly, hence the white halos.