Grass Valley Kayak HD v.6.9.3 - Manual (Page 261)

Kayak — User Manual 261
DPM Menus
Sure Touch
Sure Touch changes the way in which effects behave during recall and play-
back, providing more control and flexibility. An effect can be safely recalled
using two new modes which eliminate abrupt changes: hence the name
Sure Touch is being used. When using a Sure Touch mode, the effect adapts
itself to the switcher’s current state. Upon recall of any effect, no changes
are made to the current state, regardless of the nature or the composition of
the effect. Then, when the effect is run, the relative changes from the inter-
polated effect are applied instead of the traditional absolute output. Only
elements which changed over the course of the original effect are affected.
One way of thinking about safe touch is to think of it as running an effect
in “relative” mode.
These changes can be applied in different ways, allowing the effect to inter-
polate on a path parallel to the original effect (Parallel mode), or on a path
that converges the changing state smoothly to the actual end state of the
original effect (Converge mode). A safe touch mode can be “forced on” just
prior to recalling an effect, or it can be saved with the effect to be used auto-
matically.
This feature changes the paradigm of control for effects, allowing effects to
be applied under more flexible set of conditions and also to be used as spe-
cialized functions to perform specific actions.
Within the DPM timeline system, when an effect is first created, a snapshot
of all values is saved. For any subsequent keyframes, only values which
have changed are then saved. Those values that have changed are referred
to as “bound elements” and are subject to interpolation as the effect runs.
When an effect is recalled in a sure touch mode, the current states of the
bound elements are read by the timeline system. These values are com-
pared with the original first keyframe (snapshot) of the effect, and an
“offset” or “new zero” is established for each bound element of the effect.
This “offset” is then applied during all subsequent fields of the effect. A
new “offset” is established each time the effect is recalled. The result is that
a “new effect” is established each time the effect is recalled.
The essential result is this: When an effect is recalled in a safe touch mode,
only those values which underwent changes after the first key-frame of the
original effect are touched, and only changes in values are applied.