Using a simple green (or blue) backdrop, you can use iMovie to isolate the subject of one video clip and superimpose it over the background of a second clip. By combining clips in this way, you can create fun shots of people in dramatic settings or standing in distant locations for news and weather reports — all without ever leaving the classroom.
Add a background clip. Select a photo or video clip and add it to the timeline. This shot will be the background of the scene.
Add a green-screen clip. From the media browser, select a clip of a subject recorded in front of a solid green or blue backdrop, tap More Options button then tap Green/Blue Screen.
The green-screen clip is added to the timeline, stacked on top of your background clip. Any parts of the green-screen clip that are green or blue automatically become transparent so that the background clip shows through.
Adjust the green-screen effect. Tap Adjust button and drag the Strength slider to change the amount of green or blue removed from the background to create the most realistic blending of the two shots.
Trim out parts of the green-screen clip. Tap Mask button, then drag the corners of the frame to crop out portions of the green-screen clip that you don’t want showing.
Wander through a land of make-believe. Add student-created illustrations as backdrops to create fictional settings for your movie.
Travel back in time. Place a subject in front of archival photos and video clips of historical events for a report that brings history to life.
Use the Green/Blue Screen effect to add custom graphics to your movie. Create a still or animated graphic with a solid green or blue background in Keynote, export it, then add it as an overlay.
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