After Effect: Green screen


After Effect is a well known compositing and editing tool, with After Effect we can key out the green screen and replace the background.

1) Make a new composition and bring in the green screen footage.

2) Select the footage and use one of the common keying effect keylight(1.2).

3) From the effect control, choose screen color and use the eyedrop tool to click on the green space of the footage.

4) Then, the green color is gone. To make it more precious, change the view from final result to screen matte.

5) After that, the alpha matte will appear. Black stand for transparent, white stand for opaque and   grey stand for half-transparent.

6) To avoid some part of the object is half-transparent, try to adjust the alpha matte to clear white and black.

7) Bring in the background for your footage.

8) Color correction like adjust the brightness and contrast or hue and saturation.


9) May also use some of the powerful plugin like Magic Bullet Looks to enhance the work.


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