Grass Valley DD10 part 1 - Manual (Page 35)

2.7 Keyers Diamond digital DD10
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2.7.3 KEY MODES
Pattn Pattn
1 2
Source
Mask
Key
Add Lum Chr
Lin–– ––Lin Key
Type
Note The Add Lin and Lum Lin keys enable selecting three operational
modes (see below).
The keys 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 Add Key selects the Additive key mode. In this mode, an external unit (e.g. DVE,
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 all data contained therein will be played back in accordance with the original.
Note: Please note that the supplied fill signal must be based on a black
background. Otherwise the addition of the signals will yield a discol-
ored background signal.