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Section 1: Introduction
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Video-Key+Shadow Mode
The Video-Key+Shadow mode is similar to the
Video+Key mode, except that the key signal input to the B channel is processed
by the A channel's transform controller, so that the video and key are trans-
formed at the same time. Also, the key input is used to create a drop shadow.
The drop shadow is routed through the chrominance part of the B circuitry, and
processed by the B channel's transform controller, which provides independent
shadow transform control. Although the actual signal paths are the same as in
Video+Video mode, from an operational point of view, this makes the A chan-
nel a 4:2:2:4 path and the B channel 0:2:2.
The A/B Combiner key output in this mode is a combination of the key shadow
signals processed by the B channel.
