Best way to key/alpha photos taken in green/blue screen in GIMP?

[OrangeVixen]

What is the best way to key photos taken in a green screen or blue screen (key green or key blue) in GIMP?

I'm aware of the "Select by Color" tool, but I need a plugin or some one-pass tool/filter that I can use that will:

Alpha the background
Reduce spill/throwback green or blue
Adjust "noise" and transparency from spill/throwback

Something similar to Final Cut Pro's Motion 4 Primatte RT filter.

[earlycj5]

Colors > Color to Alpha?

[jasonrisenburg]

http://www.nebomusic.net/chromakey.html

[jasonrisenburg]

I wish there was like buttons in here.

[prokoudine]

Did you try Foreground selection tool? In my experience it works very well on more or less solid backgrounds.

There is a GEGL operation for matting, but it doesn't have a nice UI yet, so I wouldn't recommend it to a GIMP newbie, especially when you need to process pictures with alacrity