THOMSON GRASS VALLEY KayakDD-1, User Manual

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KayakDD - Digital Production Switcher
2.9.10 Look Ahead Preview
If a preview monitor is configured for Look Ahead Preview mode, the end result of the
upcoming transition can be viewed on that monitor. This lets the operator know in
advance what will occur for that next transition.
2.9.11 Current and Next Stack
KayakDD uses a current and next stack approach for transitions that involve multiple
elements. The current stack is the current M/E output including any keys that are on.
The next stack is defined by the current stack and whatever next transition elements
have been selected. Look ahead preview always displays the next stack. Next
transition elements affecting stacks are Keys 1 - 4, background, and key priority.
KayakDD transitions always occur from the current stack to the next stack.
For example, if the current stack has Key 1 over Background A, and the next stack
specifies Key 2 over Background B, a mix transition will occur between the
composites (Key 1 over A to Key 2 over B). This is different from mixing Key 1 off, Key
2 on, and mixing between A and B at the same time, which would cause the keys to go
transparent over their background during the transition.
On the KayakDD system, opacity is retained throughout the transition, so midway
through this example Key 1 remains fully keyed over Background A, and Key 2 is fully
keyed over Background B. The transition occurs between these two fully keyed
composites.
If multiple keys are faded in or out using the separate Mix button each keyer has it’s
opacity changed with relation to all other keys. This means that keyer transitioned this
way or no longer considered part of the composite and will show transparency.
2.9.12 Key Priority and Transitions
The four keyers on a KayakDD M/E can be assigned priorities. This determines the
layering of the keys. The highest priority key appears on top, while keyers with lower
priority may be partially or fully hidden behind those with higher key priorities. The
backgrounds always have the lowest priority. Changes in key priority can be included
as a part of a transition.
Like any other transition, the current stack will transition to the key priority of the next
stack. For example, suppose the current stack has Keys 1, 2, and 3 in that key priority
order over Background A, and the next stack specifies key priority order 3, 2, 1. A mix
transition will occur between the 1, 2, 3 composite order to the 3, 2, 1 composite order.
All three keys will remain fully keyed over the background, and will mix to their new key
priority order.
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