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Chapter 13. Super-imposing Clips > Using the Track Matte Key

Using the Track Matte Key

The track matte key uses a moving matte, often called a traveling matte. The matte can be a high-contrast, grayscale video clip or an image that you animate with motion settings (Chapter 13), an effect (Chapter 10), or a text roll (Chapter 11). You can also create a matte from a clip by using the Transparency Settings dialog box. Unlike a still-image matte, a moving matte must be arranged in the timeline with the foreground and background clips.

To use the track matte key:

1.
Arrange the clips for the track matte effect in the timeline:

  • Position the background clip in a lower track.

  • Position the foreground clip in the next-higher superimpose track.

  • Position the moving matte in the superimpose track above the foreground clip.

2.
Select the foreground clip (Figure 13.55).

Figure 13.55. Stack the background, foreground, and matte clips in the timeline. Select the foreground clip.


3.
Choose Clip > Video Options > Transparency (Figure 13.56).

Figure 13.56. Choose Clip > Video Options > Transparency.


The Transparency Settings dialog box appears.

4.
From the Key Type pull-down menu, choose Track Matte (Figure 13.57).

Figure 13.57. Choose Track Matte from the Key Type pull-down menu.


The effects of the track matte key appear in the sample frame of the Transparency Settings dialog box (Figure 13.58).

Figure 13.58. You can preview the first frame of the track matte key in the sample frame.


5.
Preview the key in the sample frame of the Transparency Settings dialog box.

6.
Click OK to exit the Transparency Settings dialog box.

When you preview or export the appropriate area of the program, you'll see that the matte effect moves (Figure 13.59).

Figure 13.59. When you preview or export the appropriate area of the program, the matte effect moves.



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