1. Go to iMovie Prefs and make sure SHOW ADVANCED TOOLS is checked. For some reason, it unchecks itself, so i always make sure this is turned on each time before doing Greenscreen
2. Make sure your background still is loaded into iPhoto & accessible in iMovie, or your background video clip is imported into event library
3. Drag background still or background video into Project Window FIRST
4. Drag greenscreen video clip ON TOP of background still or video till you see a green plus sign
5. Once you get green plus sign, window will pop up allowing you to select Green Screen
6. THAT'S IT!! You can open Inspector and go to video tab to adjust things like brightness/contrast etc. Try to shoot greenscreen video clip with only greenscreen behind subject, but if wall gets into clip, you can do some cropping in iMovie to get rid of it.
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