ADOBE PREMIERE PRO 2.0
User Guide
367
See also
“About keyframes” on page 230
“Working with keyframes” on page 230
“About alpha channels and mattes” on page 354
To create transparency in a superimposed clip
1
Add the background clip to a track in the Timeline panel.
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
Add the track matte clip to a third track above the tracks with the background and superimposed clips.
If you need to add a new track to the sequence, drag the track matte clip to the empty area above the highest video
track in the Timeline panel. A new track is automatically created.
4
In the Effects panel, click the triangle to expand the Video Effects bin and then click the triangle to expand the
Keying bin.
5
Drag the Track Matte Key to the superimposed clip.
6
In the Effect Controls panel, click the triangle next to the Track Matte Key name to expand its settings.
7
Click the Matte setting pop-up menu with the down-pointing triangle and choose the video track containing the
track matte clip.
8
(Optional) If you’re animating the Track Matte Key over time, make sure that the current-time indicator is in the
position you want. Click the Toggle Animation icons of the settings you want to adjust.
9
Click the Composite Using pop-up menu and choose one of the following:
Matte Alpha
Composites using the track matte clip’s alpha channel values.
Matte Luma
Composites using the track matte clip’s luminance values.
10
(Optional) Select the Reverse option to invert the values of the track matte clip.
To retain the original colors in the superimposed clip, use a grayscale image for the matte. Any color in the matte
removes the same level of color from the superimposed clip.
11
(Optional) If you’re animating the Track Matte, move the current-time indicator either in the Effect Controls
panel or Timeline panel and change the Track Matte Key settings.
A new keyframe appears in the Effect Controls timeline when you change the settings. You can also adjust the inter-
polation between keyframes by editing the keyframe graph. Repeat this step as needed.
See also
“About alpha channels and mattes” on page 354
“To edit keyframe graphs in the Effect Controls panel” on page 238
To mask out objects with garbage mattes
Sometimes the subject of a scene is properly keyed except for undesired objects. Use a
garbage matte
to mask out
those objects. Depending on the shape of the mask, you can use the Four-Point Garbage Matte, Eight-Point Garbage
Matte, or Sixteen-Point Garbage Matte. More points let you define more complex mask shapes.