THOMSON GRASS VALLEY KayakDD-1, Руководство пользователя

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KayakDD - Digital Production Switcher
3.6.2 Key Types
Add
Lin -
Lum
- Lin Chrom
a-Key
Preset
Pattern
Figure 51
Key Type Buttons
NOTE! The Add Lin and Lum Lin buttons allow selecting three different operational
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
3.6.2.1 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 background.
Otherwise, the addition of the signals will yield a discolored
background signal.
3.6.2.2 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
controls the transition between background and foreground (=fill) signal.
3.6.2.3 Lin Key
Pressing the two buttons Add / Lin and Lum / Lin sets the luminance key to a linear
mode. The key control signal corresponds to the non-amplified and unlimited
luminance signal.
84 User Manual