Tektronix Grass Valley 3000 - Manual (Page 213)

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Frame Store Operations (Option)
Grab Mode
The Grab feature updates frame store with new input data and
freezes the new data. If freeze is off (moving video is coming out
of the frame store), pressing the
GRAB button turns on freeze. You
can then press the FRZE button to turn freeze off. If freeze is on
and GRAB is pressed, frame store is unfrozen for two fields and
then frozen again. It holds two fields as it updates the other two.
Layering is possible when frame store is used as a background
input on an M/E, and that M/E is fed into the frame store, .
Dropshadow Mode
Dropshadow mode is functional with only primary video inputs
that have an associated linear key signal, or an M/E in layered
mode. Clip and gain adjustments are not available. Dropshadow
mode does not reduce the bandwidth of the key channel.
If you use a source that does not have an associated key signal, the
Dropshadow Mode produces a full raster key signal (4x3 aspect
ratio).
Drop Shadow is added to the key signal; the video output is
unaffected. Therefore the Frame Store video and key must be
composited on top of another layer in order to see the
dropshadow.
The OPACITY control adjusts the density of the drop shadow.
HORIZONTAL and VERTICAL controls position the drop shadow
anywhere on the screen. You can use DRP SHADOW BLUR (Frame
Store Menu) to blur the drop shadow.