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Editor's Toolkit: Using Overlay Mattes with Sony® Vegas® Video

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).

Here is how to use an Overlay Matte in Sony® Vegas®:

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

* Track 1: overlay matte
* Track 2: your video clip
* Track 3: background animation


Figure 1 - The timeline in Vegas with a overlay matte.

2. Click the Track FX button on Track 1 (Figure 2) and select the Mask Generator tool.


Figure 2 - The Track FX button in Track 1.

3. In the Mask Generator dialog (Figure 3), select a Luminance key from the Type dropdown. You may also need to click the Invert checkbox to get the effect you want.


Figure 3 - In the Video Track FX dialog, from the Type dropdown, select Luminance.

4. Click the Compositing Mode button in Track 1 and select "Multiply (Mask)" from the menu (Figure 4).


Figure 4 - Select Multiply (Mask) from the Compositing Mode menu.

5. Click the Make Compositing Child button in Track 2 (Figure 5).


Figure 5 - Click the Make Compositing Child button in Track 2 (Figure 5).


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