Specifications

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Io XT Installation and Operation Guide — 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.).
Matte Color: only available when the pulldown “Frame Buffer over Matte” or “Graphic over
Matte” are selected-pressing this button brings up a color selection dialog. The dialog
provides a variety of ways to select a matte color including a color wheel, color picker