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232
Adobe Premiere Pro Help
Superimposing and Compositing
Using Help
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Contents
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232
A matte containing motion is called a
traveling matte
or
moving matte
. The matte may
consist of motion footage, such as a blue-screen silhouette, or you can animate a still
image matte by applying the Motion effect in Adobe Premiere Pro (see
“Animating effects
by using keyframes” on page 245
and
“Animating effects in the Timeline window” on
page 224
). If you animate a still image, consider making the matte frame size larger than
the project frame size so that the edges of the matte don’t come into view when you
animate the matte.
Because the Track Matte key can be applied to a video clip, the matte can change over time.
You can create mattes in various ways:
•
Use the Title window to create text or shapes (grayscale only), save the title, and then
import the file as your matte.
•
Create a matte from any clip using the Chroma, RGB Difference, Difference Matte, Blue
Screen, Green Screen, or Non Red key. Then select the Mask Only option.
•
Use Adobe Illustrator or Adobe Photoshop to create a grayscale image and import it
into Adobe Premiere Pro.
To apply the Track Matte key:
1
Add the background clip to a track.
2
Add the clip you want to superimpose to any track higher than the track containing the
background clip. This is the clip revealed by the track matte.
3
On a third track, add the track matte clip. (If you need to add a third track, drag the
matte to the empty area in the Timeline window above the highest video track so that a
new track is automatically created.)
4
In the Effects window, expand the Video Effects bin and then the Keying bin, and drag
the Track Matte effect to the superimposed clip.
5
In the Effect Controls window, click the triangle next to the Track Matte name to expand
it.
6
For the Matte option, select the video track that contains the track matte.
7
In the Timeline window, hide the track containing the track matte by clicking the track’s
Eye icon.
8
Adjust other options as needed.
Composite Using
Select Matte Alpha to composite using the values in the alpha channel
of the track matte. Select Matte Luma to composite using the image’s luminance values
instead.
