Grass Valley DD35 Family v.3.1.5 - Manual (Page 70)

2. Panel Operation DD35 Production Switcher
2 – 36 Operating Instructions – Rev. 16 / 10.2001
2.7.3 HARD KEY CUT
CUT inserts or removes the key in a hard cut transition. When inserted, the On indi-
cator in the Transition Panel and the CUT button light up.
2.7.4 KEY TYPES
Pattn Pattn
1 2
Source
Mask
Key
Add Lum
Lin–– ––Lin
Type
Chr
Key
Note The Add Lin and Lum Lin buttons allow selecting three different ope-
rational modes (see below).
The buttons are lit as follows:
Key function Add/Lin (Lin Key) Lum/Lin (Lum Key)
additive key YES NO
multiplicative key
gain = unity
YES YES
multiplicative key
gain <> unity
NO YES
Add Key Button Add Key serves to select the additive key mode. In this mode, an external
unit (e.g. modern caption generators, paint systems) generates and supplies the
key signal and the associated fill signal.
The background signal is multiplied with the key control signal and added to the
supplied fill signal. This mode ensures that the supplied fill signal is not influenced
and that all details contained in it are reproduced true to the original.
Note: Please note that the supplied fill signal must be on top of a black back-
ground. Otherwise, the addition of the signals will yield a discolored
background signal.
Lum Key Button Lum Key selects the luminance key mode. The key control signal is derived
from the luminance component of the key source signal. The key control signal con-
trols the transition between background and foreground (=fill) signal.
Luminance Key is available in the modes equalized (eq) and non-equalized (neq).
Cut