I'm creating keyed 4K footage in AE using Keylight, Key Cleaner and Spill Supressor.
I'm exporting in GoPro Cineform plus alpha.
When I import the footage to PP I get a bright halo around the edges of the key that is worse where the key is most transparent.
The Green Screen is good, I'm getting good results on <5 clamping the black and >95 clamping white.
I cannot see the bright halo in AE when I view the footage.
I'm wondering if this is to do with premultiplication?