GRASS VALLEY Kayak, User Manual, Page: 70 / 558

70 Kayak — User Manual
Section 2 — Concepts
All post transform functions are made relative to the monitor screen frame
of reference. For example, a positive X post transform always moves to the
right side of the screen.
Front and Back, Near and Far
Pictures manipulated by a Kayak Digital Picture Manipulator have front
and back sides, each of which is revealed in turn as the picture spins or
rotates. After a picture has been translated it can be difficult to determine
which side was originally on the front and which was originally on the
back. This distinction can be important when, for example, different
sources are being selected for different sides of an effect.
The Kayak system uses a Near and Far convention to ease system opera-
tion. Near is always the side of the picture that is visible (facing toward the
viewer), and Far is the hidden side of the picture (facing away from the
viewer). The current Near side can be either the front side or the back side
of the picture, depending on orientation. For example, to change the source
on the visible image, just change the Near side. To change the source on the
hidden side, change the Far side. You don’t need to know whether the
image being changed is actually the front or back side.
Transform Numbering Systems
The Kayak Digital Picture Manipulator uses the following numbering
systems to precisely define picture locations, picture size, and picture rota-
tion and spin.