User manual

Automation Protocol Video Commands
Miranda Technologies Ltd Page 36
Layer Selections
The layer parameter passed to many commands can have different meanings
depending on the unit being controlled, and its current operating mode.
Swap Preview Mode
For units in swap/preview mode, where one image is keyed onto the preview
output and a second image keyed over the program output, layer selection
works like this:
• Layer 0 = preview layer
• Layer 1 = program layer
This allows independent control of both layer outputs. Automation systems
can effectively configure the units as two-output devices.
Cascade Mode
In cascade mode (default and recommended) both keyers are used to insert
independent images onto the program output. Preview ability is more limited
in this mode, but more keying layers can be viewed. In cascade mode, layer 0
is DSK1 (often called the midground layer), and layer 1 is DSK2 (often
called the foreground layer).
• Layer 0 = DSK1 (midground layer)
• Layer 1 = DSK2 (foreground layer)
Please note that midground/foreground terminology is not applicable to
Imagestore 750, LGK-3901, or Imagestore Intuition+ since these products
have more than two keying layers – (4, 5 and 16 layers respectively).
Note: Further details on the meaning of layer numbers for different
products can be found on page 269.