Adobe Premiere Pro CS4 - Manual (Page 430)

424 USING ADOBE PREMIERE PRO CS4
Compositing
Last updated 11/6/2011
Because you can use a video clip as a matte in the Track Matte Key, the matte can change over time.
You can create mattes in various ways:
• Use the Title panel to create text or shapes (grayscale only), save the title, and then import the file as your matte.
• Apply the Chroma, RGB Difference, Difference Matte, Blue Screen, or Non Red Key to any clip and then select the
Mask Only option.
• Use Adobe Illustrator or Adobe Photoshop to create a grayscale image and import it into Premiere Pro.
1 Add the background clip to a track in a 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.
(Optional) If the superimposed clip is a still image, do one of the following:
• Add an opacity key to the superimposed image,
• Insert the still image into another sequence, and superimpose the sequence containing the still image over the track
containing the background clip.
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 a Timeline panel. A new track is created automatically.
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 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 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
interpolation between keyframes by editing the keyframe graph. Repeat this step as needed.