Apple Final Cut Pro X (10.0.9) - Manual (Page 342)

Chapter 12 Keying and compositing 342
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Spill Contrast: Use this grayscale gradient to adjust the contrast of the color being suppressed,
using Black and White point handles (and corresponding sliders). Modifying spill contrast can
reduce the gray fringing surrounding a foreground subject. The Black point handle (on the left
side of the gradient control) lightens edge fringing that is too dark for a successful composite.
The White point handle (on the right side of the gradient control) darkens edge fringing that
is too light. Depending on how much spill is neutralized by the Spill Level slider, these controls
may have a greater or lesser effect on the subject.
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Black, White: Click the disclosure triangle in the Spill Contrast row to reveal sliders for the Black
and White point parameters. These sliders, which mirror the settings of the Spill Contrast
handles described above, allow you to keyframe the Black point and White point parameters
(via the Add Keyframe button to the right of each slider).
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Tint: Use this slider to restore the natural color of the keyed foreground subject. Because the
Spill Suppression controls eliminate blue or green spill by desaturating subtle blue or green
fringing and reflection on the subject, the Tint slider lets you add hues to restore the natural
color of the subject. Overdoing this parameter results in over-tinting the subject with the
complementary color of the hue being suppressed—magenta if green, and orange if blue.
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Saturation: Use this slider to alter the range of hues introduced by the Tint slider (when the
Tint slider is used at moderate levels).
5 Click Light Wrap to reveal the following controls:
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Amount: Use this slider to control the overall light wrap effect, setting how far into the
foreground the light wrap extends.
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Intensity: Use this slider to adjust gamma levels to lighten or darken the interaction of wrapped
edge values with the keyed foreground subject.
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Opacity: Use this slider to fade the light wrap effect up or down.
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Mode: Use this pop-up menu to choose the compositing method that blends the sampled
background values with the edges of the keyed subject. There are five modes:
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Normal: Evenly blends light and dark values from the background layer with the edges of the
keyed foreground layer.
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Lighten: Compares overlapping pixels from the foreground and background layers, and then
preserves the lighter of the two. Good for creating a selective light wrap effect.
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Screen: Superimposes lighter portions of the background layer over wrapped areas of the
keyed foreground layer. Good for creating an aggressive light wrap effect.
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Overlay: Combines the background layer with the wrapped areas of the keyed foreground
layer so overlapping dark portions become darker, light portions become lighter, and colors
become intensified.
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Hard Light: Similar to the Overlay composite mode, except that colors become muted.