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.
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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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