For more information, see Add audio effects in iMovie on Mac. ![]() You can reduce the volume of either clip so that sound from the other clip stands out. The audio from the original clip and the audio from the green-screen or blue-screen clip play simultaneously. ![]() Likewise, if the subject of your video contains blue or is wearing blue, you should record in front of a green background. If the subject of your video is green or is wearing green, you should record in front of a blue background. You can also drag the green-screen or blue-screen clip over a solid-color or animated background clip. For example, you could record a friend dancing in front of a green or blue backdrop, and then place that video over a clip showing a starry sky, so that your friend appears to be dancing in the sky. This is called a green-screen or blue-screen effect. ![]() You can record video in front of a green or blue backdrop, and then “cut out” the subject and superimpose it over another video clip.
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