Apple Final Cut Pro X (10.1.2) User Manual download pdf (Page 358)

Chapter 11 Keyingandcompositing 358

•

To choose a dierent color if the Keyer eect 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.

•

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

eect’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 reections.

4 To help ne-tune the key, use the View options:

Original

(unprocessed

foreground)

Matte (foreground-based

alpha signal created

by the keyer)

The name of the currently

selected View button

Composite

(foreground combined

with background)

•

Composite: Shows the nal composited image, with the keyed foreground subject over the

background clip. This is the default view.

•

Matte: Shows the grayscale matte, or alpha channel, that’s being generated by the keying

operation. White areas are solid (the foreground video is opaque), black areas are transparent

(the foreground is not seen at all), and varying shades of gray indicate varying levels

of transparency (the background video can be seen mixed with the foreground video).

Viewing the matte makes it easier to spot unwanted holes in the key or areas that aren’t

transparent enough.

•

Original: Shows the original, unkeyed foreground image.

5 To further rene the matte, use the following controls:

•

Fill Holes: Increasing this parameter value adds solidity to regions of marginal transparency

within a key. This control is useful when you’re satised with the edges of your key, but you

have unwanted holes in the interior that you can’t eliminate via the Strength parameter

without ruining your edges.

•

Edge Distance: Lets you adjust how close to the edge of your keyed subject the eect of the Fill

Holes parameter gets. Reducing this parameter value brings the lled area of the matte closer

to the edge of the subject, sacricing translucency at the edges. Raising this parameter value

pushes the lled area of the matte farther from the edge. Too much edge distance can result

in unwanted translucency within parts of the subject that should be solid.

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Apple Final Cut Pro X (10.1.2) User Manual Page 358

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