Grass Valley Karrera Video Production Center v.4.0 - Manual (Page 250)

250 KARRERA — User Manual
Section 7 — Advanced Operations
Additive Keyers
In the keyer circuitry of the switcher, unshaped video is processed using a
multiplicative key and shaped video is processed using an additive key. In
the normal course of operation, this is done automatically. Shaped video
can be turned on or off (unshaped video) for a source’s linear key in the Key
Mode pane of the Eng Setup, Source Definition menu (
Figure 130 ).
Figure 130. Eng Setup, Source Definition Menu
However, there are instances when manual control is useful:
• A source’s key is not properly defined and you wish to correct the
shape by overriding the key type, or
• You wish to key an artistic effect by changing the video to the “incor-
rect” video shaping.
Additive Keyer Operations
Additive Keyer buttons, including a button for Super Additive are pro-
vided in both the menu and in the Multi-Function area of the Control Panel.