Chapter 11 Keyingandcompositing 365
5 Do one of the following:
•
Drag the eect to the Timeline foreground clip to which you want to apply it.
•
Double-click the eect thumbnail to apply it to the selected clip.
The Luma Keyer eect automatically congures itself to remove black video. If the resulting key is
not right or you would like to improve it, you can adjust the luma key eect.
Adjust the luma key eect
The following steps assume you have applied the Luma Keyer eect.
1 In the Timeline, select the clip with the Luma Keyer eect.
2 Open the Video inspector.
The Eects section of the Video inspector shows the parameters available for adjusting the Luma
Keyer eect.
3 To reverse the key and remove white instead of black areas of the foreground clip, select Invert.
4 To adjust the white and black clip values, drag the handles at either end of the gradient
thumbnail image.
By default, these handles are set to provide a linear key where the luma level linearly controls the
transparency of the foreground—100% white is fully opaque, 0% black is completely transparent,
and 25% gray retains 25% of the foreground image. Dragging the white and black controls
changes the values that result in fully opaque or fully transparent foreground video.
5 To adjust the softness of the edges, adjust the Luma Rollo control.
Higher values make the edges harder, removing any partial transparency, while lower values take
advantage of any anti-aliasing or softness the edges might have.
6 To help ne-tune the key, use the View options:
(unprocessed
foreground)
Matte (foreground-based
alpha signal created
by the keyer)
(foreground combined
with background)
The name of the
currently selected
View button
67% resize factor
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