Keying out green screen causes grain on subject

[rickyj89135955]

So in my garage this is a homemade green screen we are using.  I understand that the lighting is off, but my subject is standing a few feet from the wall and have their own source of light.

Whenever I use Keylight to remove the screen and play the footage my subject gets this horrible grain to them.  This grain is not present when I play the green screen layer pre effect. 

Has anyone experienced this before and other than keylight, does Keylight cleaner help with this?  That kind of settings can I use for a clean removal.

[Roland Kahlenberg · Accepted solution]

In the Keylight settings, change the View menu option to "Intermediate Result". The issue you have is a long-known issue with Keylight when its View option is set to Final Result. The Final Result setting introduces color correction which unfortunately also introduces noise.

[Roei Tzoref]

In Addition to Roland’s suggestion, if you want to get rid of the spill then add the effect advanced spill supressor Instead.