Apple Final Cut Pro X (10.1.2) User Manual download pdf (Page 361)

Chapter 11 Keyingandcompositing 361

•

Chroma Rollo: Use this slider to adjust the linearity of the chroma rollo slope (displayed

in the small graph to the left of the Chroma control). Chroma rollo modies the softness

of the matte around the edges of regions that are aected most by the Chroma control.

Lowering this value makes the slope of the graph more linear, which softens the edges of the

matte. Raising this value makes the slope of the graph steeper, which sharpens the edges of

the matte.

•

Luma Rollo: Use this slider to adjust the linearity of the luma rollo slope (the ends of the

bell-shaped luma curve displayed in the Luma control). Luma rollo modies the softness of

the matte around the edges of regions that are aected most by the Luma control. Lowering

this value makes the slope between the upper and lower handles in the Luma control more

linear, which increases edge softness in the matte. Raising this value makes the slope steeper,

sharpening the edges of the matte and making them more abrupt.

•

Fix Video: Select this checkbox to apply subpixel smoothing to the chroma components of the

image, reducing the jagged edges that result from keying compressed media using 4:2:0, 4:1:1,

or 4:2:2 chroma subsampling. Although selected by default, this checkbox can be deselected if

subpixel smoothing degrades the quality of your keys.

3 Click Matte Tools to reveal the following controls:

•

Levels: Use this grayscale gradient to alter the contrast of the keyed matte, by dragging three

handles that set the black point, white point, and bias (distribution of gray values between the

black point and white point). Adjusting the contrast of a matte can be useful for manipulating

translucent areas of the key to make them more solid (by lowering the white point) or more

translucent (by raising the black point). Dragging the Bias handle right erodes translucent

regions of the key, while dragging the Bias handle left makes translucent regions of the key

more solid.

•

Black, White, Bias: Click the disclosure triangle in the Levels row to reveal sliders for the Black,

White, and Bias parameters. These sliders, which mirror the settings of the Levels handles

described above, allow you to keyframe the three Levels parameters (via the Add Keyframe

button to the right of each slider). Keyframing the Black, White, and Bias parameters may yield

a better key, one that adapts to changing blue-screen or green-screen conditions.

•

Shrink/Expand: Use this slider to manipulate the contrast of the matte to aect matte

translucence and matte size simultaneously. Drag the slider left to make translucent regions

more translucent while simultaneously shrinking the matte. Drag the slider right to make

translucent regions more solid while simultaneously expanding the matte.

•

Soften: Use this slider to blur the keyed matte, feathering the edges by a uniform amount.

•

Erode: Drag this slider right to gradually increase transparency from the edge of the solid

portion of the key inward.

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Apple Final Cut Pro X (10.1.2) User Manual Page 361

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