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CHP. 14 USING VIDEO FX, COMPOSITING, AND MASKS
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In the second example, track two is the child track of track one (the parent track), and the compositing
mode of track one is set to
Mask. This parent/child relationship was set up by clicking the Make Compositing
Child button ( ) in the track list for track two. This makes the text in track one act as a mask over track two,
allowing the fire to show through the mask (i.e., the text). The region outside of the text is still transparent,
but there is nothing below these tracks, so it appears black.
In the third example, a generated media event was added to the track below the first two tracks, which are
already paired in a parent/child relationship. The color gradient event in track three shows through the
transparent area of the top two paired tracks.
Selecting compositing modes
The Compositing Mode button ( ) determines how the
transparency in a video track is generated. Since lower tracks
show through higher tracks, it is the compositing mode of the
higher track that determines how much of the lower track shows
though.
Note:
The compositing mode of the lowest video track is a
special case. Selecting a mode for the lowest track affects its
transparency against a black background.
To select a compositing mode, click the Compositing Mode button and choose a mode from the menu that
appears, or choose
Custom to customize compositing with a 2-to-1 transform plug-in.
Custom compositing modes are available only in the full version of Vegas software.
Make Compositing
Child button
Parent track
Child track
Click to choose a
compositing mode