User guide

6-73
The Timeline
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To display the alpha channel of a video clip you have to activate the
menu option Show Alpha Channel only on the context menu of a
video clip in the timeline of the Edit Tool (see also section “The Context
Menu of Video Clips” on page 6-61). Then the video overlay and the
DVS system’s video outputs will show you the alpha channel mask of
the video clip where the menu option was activated. The parts of the
images displayed in white are selected, black areas are not selected (i.e.
keyed out).
In case a clip provides no alpha channel, the displayed images
will be completely white, showing that nothing is keyed out.