Adobe Premiere Pro CS4 User Manual
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USING ADOBE PREMIERE PRO CS4
Compositing
Last updated 11/6/2011
The following Difference Matte settings are adjusted in the Effect Controls panel:
View
Specifies whether the Program Monitor shows the Final Output, Source Only, or Matte Only.
Difference Layer
Specifies the track to be used as the matte.
If Layer Sizes Differ
Specifies whether to center the foreground image or stretch it to fit.
Matching Tolerance
Specifies the degree to which the matte must match the foreground in order to be keyed.
Matching Softness
Specifies the degree of softness at the edges of the matte.
Note: The RGB Difference Key uses color to define transparency much as the Difference Matte uses a still image.
Blur Before Difference
Specifies the degree of blur added to the matte.
1
Find a frame of your foreground clip that consists only of the static background. You will use this frame as a matte.
Save this frame as an image file. It will appear in the Project panel.
2
Drag the matte frame from the Project panel to a video track in a Timeline panel.
3
Drag the clip you want to use as the background to a track in a Timeline panel above the matte frame.
4
Place the video clip you wish to use in the foreground on a track in a Timeline panel above the background clip.
5
(Optional) If you’re animating the Difference Matte over time, make sure that the current-time indicator is in the
position you want. Click the Toggle Animation icons
for the settings you adjust.
6
In the Effects panel, expand the Video Effects bin and then the Keying bin.
7
Drag the Difference Matte effect onto the foreground video clip.
8
In the Effect Controls panel, click the triangle next to Difference Matte to expose its controls.
9
From the Difference Layer drop-down menu, select the track that contains the matte frame.
10
Adjust the other settings as needed to achieve the desired effect.
11
(Optional) If you’re animating the Difference Matte, move the current-time indicator either in the Effect Controls
panel or Timeline panel and change the Image Matte settings.
A new keyframe appears in the Effect Controls timeline when you change the settings. You can also adjust the
interpolation between keyframes by editing the keyframe graph. Repeat this step as needed.
More Help topics
Move or change the transparent area with Track Matte Key
The Track Matte Key reveals one clip (background clip) through another (superimposed clip), using a third file as a
matte that creates transparent areas in the superimposed clip. This effect requires two clips and a matte, each placed
on its own track. White areas in the matte are opaque in the superimposed clip, preventing underlying clips from
showing through. Black areas in the matte are transparent, and gray areas are partially transparent.
A matte containing motion is called a traveling matte or moving matte. This matte consists of either motion footage,
such as a green-screen silhouette, or a still image matte that has been animated. You can animate a still by applying the
Motion effect to the matte. If you animate a still image, consider making the matte frame size larger than the sequence
frame size so that the edges of the matte don’t come into view when you animate the matte.