AJA IoXT - Manual (Page 44)

Io XT v10.4 www.aja.com 44
DS Keyer 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.).
Figure 38. AJA Control Panel, Downstream Keyer Screen
Settings in the DS Keyer Screen provide control over how the keyer operates and
whether it's turned on or off. Controls and their meanings in the 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.).