KONA LH Capture, Display, Convert v14.3 38 www.aja.com
Downstream Keyer Screen
Figure 23. AJA Control Panel, DS Keyer Screen
KONA cards have 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 KONA’s internal Frame Buffer (from storage, video In, KONA TV, etc.) or
from a graphics file that has an alpha channel (PhotoShop etc.).
Settings in the DS Keyer Screen provide control over how the keyer operates and
whether it’s turned on or off.
NOTE: Different controls are available, depending on KONA LH model. For example,
Graphic capabilities are available on KONA LHi, but not on KONA LHe plus.
Downstream Keyer 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.
