Apple Final Cut Pro X (10.0.9) - Manual (Page 337)

Chapter 12 Keying and compositing 337
To improve the key, you can drag the rectangle to adjust its position or drag its corners to
change its size, and you can drag additional rectangles over any areas with the chroma key
color still showing.
Tip: Select Matte (the center button) in the View area in the Video inspector to see the matte
that the chroma keyer is creating. This can make it much easier to see areas that are not
keying well.
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To refine any difficult areas, such as hair and reflections: Click the Edges thumbnail image in
the Video inspector, draw a line across the difficult area in the Viewer (with one end in the
area to keep and the other in the area to remove), and drag the line’s handle to adjust the
edge softness.
Drag to set the edge softness.
You can use the following keyboard shortcuts to work directly in the Viewer:
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To make a Sample Color adjustment: Draw a rectangle while holding down the Shift key.
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To make an Edges adjustment: Draw a line while holding down the Command key.
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To delete a Sample Color or Edges adjustment: Click a Sample Color rectangle or Edges line
while holding down the Option key, or select the control and press the Delete key.
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To choose a different color if the Keyer effect chose the wrong color: Set the Strength parameter
to 0 (to override the automatic initial color sampling). Then use Sample Color to choose the
color to remove. Select Composite (the left button) in the View area to see the foreground clip
combined with the background clip.
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To adjust how strongly the Keyer matches a color in the foreground image to the default chroma
key color: Use the Strength slider to adjust the tolerance (core transparency) of the Keyer
effect’s automatic sampling. The default value is 100%. Reducing this value narrows the range
of color sampled, resulting in less transparency in the keyed image. Increasing the Strength
value expands the range of color sampled, resulting in more transparency in the keyed image.
The Strength parameter is useful to retrieve areas of semitransparent detail such as hair,
smoke, or reflections.