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Chapter 11 Keyingandcompositing 366
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Composite: Shows the nal composited image, with the keyed foreground subject over the
background clip. This is the default view.
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Matte: Shows the grayscale matte, or alpha channel, that’s being generated by the keying
operation. White areas are solid, black areas are transparent, and varying shades of gray
indicate varying levels of transparency. Viewing the alpha channel makes it easier to spot
unwanted holes in the key or areas that aren’t transparent enough.
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Original: Shows the original, unkeyed image.
7 To leave smoothly aliased text or graphics in the image visually intact, which can improve the
edges, select Preserve RGB.
8 To mix the keyed eect with the unkeyed eect, adjust the Mix control.
For information about making advanced luma key adjustments, see the following instructions.
Make advanced luma key adjustments
The following controls are available for use in dicult keying situations or for ne-tuning specic
problems:
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Matte Tools: These controls are for rening the transparency matte generated by the previous
sets of parameters. These parameters don’t alter the range of values sampled to create the
keyed matte. Instead, they alter the matte generated by the Keyer eect’s basic and advanced
controls, letting you shrink, expand, soften, or invert the matte to achieve a better composite.
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Light Wrap: These controls are for blending color and lightness values from the background
layer of your composite with the keyed foreground layer. Using these controls, you can
simulate the interaction of environmental lighting with the keyed subject, making it appear as
if background light wraps around the edges of a subject.
The following steps assume you have applied the luma key eect.
1 In the Timeline, select the clip with the Luma Keyer eect.
2 Open the Video inspector.
The Eects section of the Video inspector shows the parameters available for adjusting the Luma
Keyer eect.
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