Good day, Dave!
I have the similar problem using Keylight in After Effects, and i’ve prepared some screenshots of what i did, so please, tell me what’s wrong here.
I try to use your method: duplicate layers, then use the top one as an alpha for the layer beneath. It reduces black points as if i increase Clip Black parameter. But it doesn’t reduce the noise (i showed in screens three sequential shots and there is a lot of noise).
Here is the zip file with screens from my monitior: https://www.sendspace.com/file/tt0rzh
If you could help me, i’ll be very grateful for you!
Thanks!
P.S. I don’t want to remove all the shadows of table and sofas. And i don’t want to make the floor be very clean. It should be with gray spots on it, but without this noise on theese spots.