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Lesson 4. Color and Opacity > Applying the Track Matte opacity key type

Applying the Track Matte opacity key type

Premiere's Track Matte Key effect lets you customize and layer movies. When you apply this key effect, you can play one movie through the matte of another while yet another movie plays in the background.

When you create a track matte effect, the order of your clips is important. Applying the Track Matte Key effect to different clips and different video tracks results in a wide range of effects. You'll see some of those effects in this lesson.

Use the Track Matte Key to superimpose one clip over another, using a third file as the matte that integrates the two. Areas of white in the matte create opaque areas in the superimposed clip, preventing underlying clips from showing through. Black areas in the matte create transparent areas, and gray areas make partially transparent areas. 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.

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. For more information about the Titler and Title window, see Lesson 11 “Titles and Credits” in this book.

  • 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, import it into Adobe Premiere Pro, and then (optionally) apply motion settings to the image.

In this section, you'll apply the Track Matte effect using the Sequence 01 Timeline.

In Sequence 01, select Mtntop.avi so that the Chroma key is active in the Effect Controls window.

In the Effect Controls window, click on the Chroma Key name and deselect it by toggling the Effects icon () to off. It is located to the left of the triangle next to the Chroma Key. This will allow you to go back to experiment with it later.

In the Project window, select Bin 01 and choose File > Import.

Select Trackmatte.psd in the 04Lesson folder and click Open.

The Import Layered File dialog box appears.

Select Choose Layer and make sure Document Size is selected for the Footage Dimensions.

Click OK.

In the Project window, click Layer1/Trackmatte.psd in Bin 01 and choose Clip > Speed/Duration.

The Clip Speed/Duration box appears.

Change the Duration to 3.06 to match the Mtntop.avi and Notmuch.avi clips.

Click OK.

Insert Layer1/Trackmatte.psd onto the Video 3 track at the beginning of Sequence 01 so that it is superimposed over Mtntop.avi and Notmuch.avi.

In the Effects palette, locate the Track Matte Key video effect.

Drag the Track Matte Key to the Mtntop.avi clip on the Video 2 track.

In the Timeline, select Mtntop.avi to make the Track Matte Key active in the Effect Controls window.

In the Effect Controls window, click on the triangle next to the Track Matte Key to expand its settings.

From the Matte field menu choose the Video 3 track.

Other aspects of this effect are Composite Using and Reverse. 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. Reverse inverts the values of the track matte.

For Composite Using choose Matte Alpha.

In the Timeline select the Video 3 track.

Choose Clip > Enable to toggle it to Disabled (unchecked). This is done so that the Trackmatte.psd image is not part of the composite; only its opacity values will be used.

Preview the effect.

Results with Video 3 track disabled for the final Track Matte effect

Save the project.

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