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Chroma keying makes one color in a clip transparent — point it at a green screen and the subject floats free, ready to composite over whatever sits on the tracks below.

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Enable the keyer

Select a video or image clip, open Properties → Compositing, and find the Chroma Key section. Check Enable chroma key removal to turn the keyer on — the controls appear below the checkbox. Place your background media on a track below the keyed clip so it shows through the transparent areas.

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Controls

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Dial in a clean key

1

Pick the screen color

Set Screen to match your backdrop — Green for standard green screens, Blue or Red for other setups.
2

Raise Similarity until the screen disappears

Scrub to a frame where the subject and backdrop are both visible, then increase Similarity until the last traces of the screen drop out. Back off if edges of the subject start to vanish.
3

Soften with Blend

Nudge Blend up until hair and edge detail stop looking cut out. Keep it low for crisp graphics.
4

Check it in motion

Play the clip. If the edge sparkles between frames, add a little Smoothing.
You can also ask the Studio assistant to enable or adjust the chroma key on a clip — useful when you’re iterating on several keyed layers at once.