Grass Valley Zodiak v.6.0 Mar 15 2006 - Manual (Page 46)

46 Zodiak — User Manual
Section 2 — Concepts
Transitions
A transition is a change from one image to another. The Zodiak system
supports four (three basic and one optional) types of transitions:
• Cut
• Mix
• Wipe
• DVE (optional)
A transition can be applied to the entire picture, or to only the background
or keyed elements of the picture, and can include multiple elements.
Cut
A cut is an instantaneous switch from one image to another (between suc-
cessive video fields or frames). The simplest type is a hot cut, accomplished
by selecting a different source on a bus feeding an M/E output. This only
changes that bus’s contribution to the output, and does not change what
elements may be involved in the output (the same buses are involved).
The Zodiak system also provides cut transitions, where the elements
involved in a composite can be changed instantaneously. Different buses
can be included or excluded, causing changes in the resulting composite
image. Background cut transitions on an M/E are first selected on the Back-
ground B bus to allow previewing the upcoming picture before it is cut on-
air.
Mix
A mix is a transition from one picture to another where the new picture
fades in as the existing picture fades out. During a standard mix transition
a superimposition of both pictures, each at a lower intensity, is visible.
The Zodiak system allows mixing from one background to another and to
mix up to four separate keys on or off over a background. Background and
key mixes can be done separately or simultaneously.
Full Additive Mix
Full Additive Mix (FAM) is a special mix transition that the Zodiak system
supports besides normal crossfade transitions. Picture elements in FAM
transitions are composited differently through the time of the
transition(
Figure 14 ).