Bright halo around PP keyed imports from AE

[Nick Fawbert]

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?

Any ideas?

[Ann Bens]

Check Interpret footage for the alpha channel might want to adjust that or export again from Ae with different settings.

[Nick Fawbert · Accepted solution]

The solution to this lay in the order of applying effects.

If Lumetri colour is applied after the key, it creates bright fringing around the key.

So apply Lumetri colour correction before the key is applied.