Step 1: Create a new project
Select File>New Project. Give your project a name. If your Green Screen footage has its own event, choose its name as the Default Event. Click OK.
Step 2: Insert clips
If you need to import your footage into Final Cut, choose File>Import From Camera or File>Import. Alternatively, you can drag clips onto the Timeline.
Step 3: Effects pane
Click on the Effects icon. Choose the Keying option from the list of choices on the Effects pane. In the Keying section, select the Keyer effect.
Step 4: Apply Keyer
Drag the Keyer effect on top of your Green Screen footage. The Green Screen area of your clip will turn black. Don’t worry if it’s patchy – we can fix this.
Step 5: Open Inspector
Next, select your clip and click on the ‘i’ icon on the right-hand side to launch the Inspector. Click Video at the top of the Inspector pane.
Step 6: Change the view
In the Keyer section, scroll down to the View heading and click on the Matte icon – the Matte icon depicts a white person on a black background.
Step 7: Matte view
Your actor will turn white and your background black. Matte view helps expose ‘opaque’ holes – you want a solid background and a solid person.
Step 8: Fill the holes
Holes? Navigate to the Keyer section of the Inspector and scroll to Fill Holes. Drag the slider to the right until any opaque spots have turned black or white.