7700 Multiframe Manual
7725DSK-LG / 7725DSK-LG-HD HD/SD Logo Inserter & Media Keyer
Page 4-22 Revision 1.4 RCP OPERATION
4.8.3. Setting a User Defined Matte Aspect Ratio
There are two menu items that allow the user to define custom aspect ratios for the matte. Selecting a
pre-defined aspect ratio will lose any changes you have made to the Matte Top and Matte Bottom
menu items unless they are stored using the user presets (see section 4.11). When you manually
change the Matte Top and Matte Bottom settings the Matte Aspect will show the aspect ratio as (user).
MATTE
Top
Top: x
This menu item is used to set the bottom line of the Top matte.
Use the Ï or Ð buttons to change the line number to the desired value.
Either field 1 or field 2 lines can be used.
MATTE
Bottom
Bottom: x
This menu item is used to set the top line of the Bottom matte.
Use the Ï or Ð buttons to change the line number to the desired value.
Either field 1 or field 2 lines can be used.
4.9. DOWNSTREAM KEYER CONFIGURATION ITEMS
The 7725DSK-LG has a downstream keyer layer that allows 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. Table 4-4 shows the items available in the DSK Setup menu. Sections 4.9.1 to 4.9.5
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 4-4: Top Level of the DSK Setup Menu
4.9.1. Setting the Downstream Key Type
DSK
Key Type
Type: input
Type: self
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 7725DSK-LG 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.
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