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Editor's Toolkit: Using Overlay Mattes with Adobe® Premiere®

The various mattes in the Editor's Toolkits are simply black and white animations that are used to define transparency in composited video. These animations do not have built-in alpha channel transparency like the many full-color effects and transitions in the Toolkits and therefore a slightly more complex to use.

The first video uses one of the stock alpha channel overlay from Super Set 115 (ETK:5), while the second video uses a black and white overlay matte from the same Super Set and a completely different animated texture (Jump Backs animation #836 from JB21).

To use an overlay matte in Adobe® Premiere®:

1. Arrange your clips on the timeline (Figure 1):

* Video 3: overlay matte
* Video 2: background animation
* Video 1: video clip


Figure 1 - The timeline in Premiere with an overlay matte.

2. Add a Track Matte Key to the clip on Video 2: Effects > Video Effects > Keying > Track Matte Key.

 
Figure 2 - Add a Track Matte Key to the clip on Video 2.

3. In the Effects Control window (for the clip on Video 2), select the Track Matte Key and set the Matte to Video 3 (Figure 3).


Figure 3 - In the Track Matte Key Effect Control for the clip in Video 2. Set the Matte to "Video 3" and the Composite Using mode to "Matte Luma."

4. Set Composite Using to Matte Luma (Figure 3).

5. Click the Toggle Track Output off for the Video 3 track (Figure 4).


Figure 4 - Click the Toggle Track Output in Video 3.


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