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Finalize a key in Final Cut Pro for Mac

Quite often your foreground image has objects that you don’t want to appear in the composited output. These could be production items like microphone booms and light stands or the edges of the chroma key backdrop. Additionally, you might need to resize or reposition the foreground object to better fit with the background. As a final step, you can use the color corrector to adjust the foreground so that it matches the look of the background.

Final Cut Pro includes effects that you can use for these purposes.

Use a mask effect to remove unwanted parts of the foreground image

  1. In the Final Cut Pro timeline, move the playhead to the point in the background clip (the clip you want to superimpose the chroma key clip over) where you want the key to start.

  2. In the browser, select the part of the foreground clip (the chroma key clip) you want to key over the background, then choose Edit > Connect to Primary Storyline (or press Q).

    The timeline showing the background clip connected to the chroma key clip

    For details about connecting clips in this way, see Connect clips in Final Cut Pro for Mac.

  3. Select the foreground clip.

    The viewer showing the chroma key foreground video with an image of a person against a green background

    In the above example, the light stands need to be removed.

  4. Click the Effects button in the top-right corner of the timeline (or press Command-5).

    The Effects button above the timeline
  5. In the Effects browser, double-click a mask effect to apply it to the selected foreground clip.

    Tip: Type “mask” in the Effects browser search field to quickly find the various mask effects. See Intro to masking in Final Cut Pro for Mac.

    The viewer showing a mask effect applied to the chroma key foreground clip
  6. Adjust the edges of the mask to crop out the objects you want to remove.

    The viewer showing the adjusted mask

    When adjusting the mask, be sure to leave shadows and other details that can help make the key more realistic later.

  7. Apply the appropriate keyer effect to the foreground clip.

    The foreground is composited over the background.

    The viewer showing the subject in the foreground clip composited over the background

Use Transform to position the foreground image

You can use the Transform effect to reposition a keyed foreground image.

The viewer showing the subject in the foreground clip composited over the background
  1. Select the foreground clip in the Final Cut Pro timeline.

  2. Click the pop-up menu in the lower-left corner of the viewer, choose Transform, and move the image to the position you want.

    You can also resize the image.

    The viewer showing the subject in the foreground clip resized and moved to the left
  3. When you’ve finished repositioning the foreground image, click Done in the viewer.

Download this guide: PDF

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