AJA Io4K - Manual (Page 43)

Io XT/4K v10.5r2 www.aja.com 43
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 Frame Buffer.
Audio In: Select audio out to be routed from the Io XT’s selected input(s).
Graphic File This pulldown allows you to choose from any recently accessed file or select a new file
(“Load File...”), which then brings up a file dialogue. Remember that the file raster (pixel x
pixel count) should match the primary format in the frame buffer or the secondary
format if up-converting. Example: you wish to key a logo on top of your 1920x1080
footage, the still image with alpha channel that you load should be 1920x1080.
Timecode Screen
The Timecode input:
• Selects the timecode stream read for applications that use it (for example, AJA Control
Room, when the timecode source is set to “Use control panel setting,” will read the
selected stream)
• Is used for monitoring the RP-188 timecode embedded in the digital data stream
• Is used for selecting a timecode offset (if required)
Figure 39. AJA Control Panel, Timecode Screen