When this option is selected, a frame is grabbed from the currently selected input
video signal, which must contain the key channel to be applied to the captured image.
(The key channel can be captured from a separate input from that of the image, or the
connections of the currently selected video input must be changed to provide the key
signal.)
The key channel is incorporated into the image file named Grabbed. This file must
then be renamed in the Flash Memory Mgmt option of the System Config menu,
or else it will be overwritten by the next video grab.
Related Settings: Flash Memory Mgmt (System Config menu),
Grab 8-bit Video
Grab & Apply Luma Key
Captures an 8-bit frame from video for use with the unit’s linear keyer, with its key
channel defined by the current settings of the Luma Key Gain and Threshold options
(detailed later in this section).
When this option is selected, a frame is grabbed from the currently selected input
video signal. While the frame is grabbed, the video output will be briefly frozen, then
resume live operation. The settings of the Luma Key Gain and Threshold options are
used to define the key channel for the image from a luminance key, thus creating a
file that will be keyed over the incoming video by the linear keyer. The settings of the
Luma Key Gain and Threshold options must be specified prior to the use of the Grab
& Apply Luma Key function.
The captured frame is saved as a file named Grabbed. This file must be renamed in
the Flash Memory Mgmt option of the System Config menu, or else it will be
overwritten by the next video grab.
Related Settings: Flash Memory Mgmt (System Config menu),
Luma Key Gain, Threshold
Luma Key Gain
Adjusts the gain of the luminance key used to define the key channel in the Grab &
Apply Luma Key option (detailed earlier in this section).
Valid Settings: Hard Key, 1% to 100%
Default Setting: Hard Key
Related Settings: Grab & Apply Luma Key, Threshold
Threshold
Adjusts the threshold of the luminance key used to define the key channel in the Grab
& Apply Luma Key option (detailed earlier in this section).
Valid Range: 0.8 IRE to 99.9 IRE (525-line mode)
5.3 mV to 699.3 mV (625-line mode)
Default Setting: 7.5 IRE (525-line mode)
52.5 mV (625-line mode)
Related Settings: Grab & Apply Luma Key, Luma Key Gain
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DPS-475/575 Service Manual
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