KONA Capture, Display, Convert v15.2 52 www.aja.com
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. Keyed video can be from the KONA’s internal
framebuffer (from storage, video In, KONA TV, etc.) or from a graphics file that has
an alpha channel (PhotoShop etc.). Downstream keyer operation requires Control
Panel to be in Playback mode (select Test Pattern as the Video Output in the
Control screen).
NOTE: KONA's downstream keyer works with SD/HD/2K signals only, not 4K/UltraHD
signals.
Settings in the DS Keyer Screen provide control over how the keyer operates and
whether it’s turned on or off.
Downstream Keyer
Mode
• Downstream Keyer Off - When this pulldown menu item is selected the
downstream keyer will be turned off.
• Frame Buffer over Matte - fixed color matte determined by the “Matte Color”
setting set separately.
• Frame Buffer over Video In - Places the keyed video currently in the
framebuffer 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 KONA card’s framebuffer (which
might be from storage, video In, KONA TV, 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 (choose from a location anywhere on the computer screen), numeric
sliders, swatches, “crayons”, and spectrums. The matte chosen will be used as a
video background under the keyed video.
Foreground pre-multiplied (checkbox)
Use to avoid “matte lines” and improve the appearance of the foreground (key)
being composited over the background.
Audio Out
• Frame Buffer - Select audio out to be routed from the contents of the
framebuffer.
• Audio In - Select audio out to be routed from KONA’s currently selected
input(s).
Opacity (slider)
This slider controls the transparency of the keyed video (over the background)
from translucent to completely opaque.
