Sony DVS-7300, User Manual

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Chapter 4 Basic Operations for Image Creation
This section describes some of the effects which you can create using mix/
effects banks.
Backgrounds and Keys
You can use each of the mix/effects banks to insert one or two keys into a
background video image.
To define a key requires two video signals, the key source, which specifies
which part of the background is cut out, and the key fill, which supplies the
different video to insert in the cutout.
The following illustration shows an example in which the key source and key
fill signals are actually the same (“self-keying”), and which superimposes
some lettering on the background.
Background and key
Using the Mix/Effects Banks
Key source and key fill
Background
Key