Grass Valley Maestro Master Control v.2.4.0 - Manual (Page 245)

241 MAESTRO User Manual
Section 2 — Basic Maestro Operation
External/Self Keys
Some types of sources provide an external key or cookie cutter signal in addi-
tion to their main video (fill) output. These sources, generally character
generators, digital video effects units, and graphic systems, generate this
signal to provide cleaner keys. By default, the external key will always start
in the self key mode.
Auto routing configuration
The system can be configured so that when a graphic source is selected the
Maestro will automatically select the appropriate key mode (
Key Cut or
external) and, for external mode, route the appropriate key signal to the
Maestro keyer.
If Maestro has automatically selected external key mode, you can still select
Key Cut if desired, but doing so will usually result in an inferior key.
Key Fill
Once a key source has been selected, and external or Key Cut (Self Key)
chosen, it is necessary to choose the type of key fill desired. If video fill is
selected by leaving the
Key Fill button OFF, the video coming from the key
source will be used to fill the key. This is the mode generally used with all
key sources except character generators (CG). This mode is also generally
used with CGs that can color characters.
The matte mode is selected by toggling the Key Fill button ON. This mode
causes the key to be filled with a color from the internal matte generator
instead of with video from the key source.
Note The matte mode is presently limited to black.
Clip, Gain, and Opacity Adjustments
The Clip controls adjust the clip value or the luminance threshold of the
keyer, which is the linear type. Adjust this control in conjunction with the
keyer
Gain control so the characters and background are both complete and
visible.
Note Default linear key mode settings are Clip 50%, Gain 0, Opacity 100%.
Key Setting Memory
The key settings for a particular source follow that source no matter where
it goes. For instance, if CG1 is selected on Preset, and the operator adjusts