How does AE cut the green screen?

1. First, open AE import material to create a new composition (click menu File-Import-File).

2. Then create a new composition.

3. Set in the pop-up dialog box.

4, and then add the effect (effect-keying-? Key light).

5. Click and select the eyedropper tool to absorb the green color on the screen, and then you will see that the background becomes transparent. Finally, you can fill in a new background to make the picture more beautiful.