Subjects are grainy and have less resolution when I key out green background

After I have chosen the color of the green screen to key out and adjusted my 'clip black' and 'clip white' setting, I am still finding that my subjects are grainy and have lost some resolution. Any suggestion on how to fix this?
Adobe After Effects CS6
thanks!
Robert

Hi,
Another tip, is to not allow Keylight to do a "final result" output, rather set it to do a "intermediate result". I dont know if this is a best practice, but I find that AE does some pretty hectic colour correction if allowed to do its own thing. Once I get an intermediate result, I usually add a copy of the "Spill Suppressor" effect.
I find that the final result adds a lot of edge crawl to the key I am pulling (although I am aware that I am still working at getting the correct balance to Screen lighting and Talent lighting)
Pierre
PS (Happy New Year to everyone - I look forward to another year of problem solving and great chats together!)

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Subjects are grainy and have less resolution when I key out green background

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