Grass Valley Zodiak v.6.0 Mar 15 2006 - Manual (Page 57)

Zodiak — User Manual 57
Keying
of the key cut signal determines where and how deeply the hole will be cut
into the background. The intended soft edge and translucency of the key
can then be faithfully reproduced (
Figure 20 ).
Figure 20. Linear Keying
Note The soft edges in the illustrations in this part of the manual are simulated. The
key edges are actually gradients, which allows these edges to blend smoothly
with the background.
Fixed and Adjustable Linear Keys
The Zodiak system supports both fixed and adjustable linear keys. A fixed
linear key uses clip and gain values defined in system configuration to
create the key cut signal. Typically these values are Clip 50% and unity
Gain (equivalent to Clip Hi 100%, Clip Lo 0%). Once fixed linear key values
are defined, these sources can be used easily without the operator having
to set up the key every time it is used.
An adjustable linear key provides the operator limited control over Clip
and Gain (or Clip Hi/Lo) values. This lets the operator fine tune the set-
tings if the normal fixed linear values are not producing a good enough
key.
Background Video
Key Cut Key Control
(typically unchanged)
Completed
Linear Key
Key Fill
LOGO LOGO
LOGO
+
Key Hole in Background
x
Clip
Gain
Invert
0
618_00_61
LOGO
L O G O
L O G O