AJA io XT, Installation And Operation Manual, Page: 45 / 66

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Io XT Installation and Operation Manual — Control Panel Operation
DS Keyer Tab Screen
The Io XT has a hardware-based downstream keyer that is ideal for putting logos,
“bugs” or other video material with an alpha channel on top of video being played out
or printed to tape. A typical application would be putting a television station's call
letters or channel over program video content. Keyed video can be from the Io XT
internal Frame Buffer (from storage, video In, etc.) or from a graphics file that has an
alpha channel (PhotoShop etc.).
AJA Control Panel, Downstream Keyer Tab
Settings in the DS Keyer tab provide control over how the keyer operates and whether
it's turned on or off. Controls and their meanings in the Tabbed screen are as follows:
Mode:
Downstream Keyer Off — when this pulldown menu item is selected the
downstream keyer will be turned off
Frame Buffer over Matte— places the keyed video with alpha channel currently
in the Frame Buffer over a fixed color matte determined by the “Matte Color”
setting set separately.
Frame Buffer over Video In—places the keyed video currently in the Frame
Buffer over the video input for playout or print-to-tape.
Graphic over Matte—places a graphics file having an alpha channel (chosen in
“Graphic File” pulldown) over a fixed color matte determined by the “Matte Color”
setting set separately.
Graphic over Video In—places a graphics file having an alpha channel (chosen in
“Graphic File” pulldown) over the video input for playout or print-to-tape.
Graphic over Frame Buffer—places a graphics file having an alpha channel
(chosen in “Graphic File” pulldown) over the current contents of the Io XT Frame
Buffer (which might be from storage, video In, etc.).