7800 Multiframe Manual
7825DSK2-LG(-HD)(-3G) 3G/HD/SD Dual Downstream Keyer
Page 5-24
Revision 2.0
RCP OPERATION
5.9. DOWNSTREAM KEYER CONFIGURATION ITEMS
The 7825DSK2-LG(-HD)(-3G) has two downstream keyer layers that allow the user to key objects into
the output video. The
DSK Setup
menu is used to configure the downstream keyer functions – key
type, gain, and thresholds. The 7825DSK2-LG(-HD)(-3G) has two DSK layers in which all of the
controls are identical, therefore, for the sake of brevity only one DSK layer will be discussed. Table 5-4
shows the items available in the
DSK Setup
menu. Sections 5.9.1 to 5.9.5 provide detailed information
about each of the sub-menus.
Key Type
Selects whether the DSK will perform a self key or use the supplied key
and fill signals
Key Gain
Adjusts the transparency of the keyed object with respect to the key input
Key Offset
Shifts the base level for the entire range of colour values with respect to
the key input
Key Threshold
Sets the level of the Fill signal where the self key will occur
Auto Key Enable
Selects whether automation can turn the Media layer ON and OFF
Table 5-4: Top Level of the DSK Setup Menu
5.9.1.
Setting the Downstream Key Type
DSK
This menu item is used to select whether the downstream keyer will use the
key and fill input to perform the keying function or whether it will perform a
self-key.
Select
input
to use the key and fill inputs provided on the
KEY
and
FILL
video inputs of the 7825DSK2-LG(-HD)(-3G) respectively.
Select
self
to perform a hard self-key of the
FILL
video input using the
FILL
luminance threshold value set in the
Key Threshold
menu item.
Key Type
Type: input
Type: self
5.9.2.
Setting the Downstream Key Object Transparency
DSK
This menu item is used to modify the opacity (transparency) of the keyed
object used in
input
key mode.
Use the
or
buttons to change the
Key Gain
value. The default
Key
Gain
value of 100 will leave the transparency of the keyed object
unmodified from that defined by the key signal. Lowering the
Key Gain
value will reduce the opacity of the keyed object (i.e. make it more
transparent). Increasing the
Key Gain
value will increase the opacity of the
keyed object (i.e. make it less transparent).
Key Gain
Gain: 100
Gain: 50 to 170
