AJA io 4k - Page 25

Io XT/4K Capture, Display, Convert v14.0 25 www.aja.com
Graphic File Display
In addition to the test patterns above, a “Load File...” selection at the bottom
of the Test Pattern dropdown menu allows you to load a standard RGB/RGBA
graphics file (.tif,.psd, etc.) into the frame buffer for display (including alpha
channel). Some graphics formats and bit depths may not be supported. Files that
have been loaded are listed for quick reuse. Loaded graphic files are retained for
redisplay if another test pattern is selected, and even if Io XT/4K is power cycled.
NOTE: A loaded graphics file will not be scaled to fit. If it’s smaller than the current frame
buffer format,Io XT/4K will center it in the frame. If larger than the current frame
buffer format it will be cropped.
• Clear Files - This selection on the pulldown clears all the Graphic Display les.
Playback Timing
Use these controls to set the Genlock source and Timing adjustment.
Genlock
Selects how Io XT/4K will synchronize program video:
• Freerun: Generates sync without an external reference source
• Ref In: Use the Ref Video source for sync (usually an analog black burst video
signal)
• Video In: Use whichever video input source has been selected in the Inputs
screen for sync
For video stability and proper system operation, you can genlock all equipment
to house sync. However genlock is not required for Io XT/4K due to its excellent
freerun accuracy. On the Io XT/4K house sync is connected to “LTC/Ref In”.
Alternatively, Io XT/4K can receive externally supplied Linear Time Code on that
same input connector. The LTC/Ref setting on the Input Select screen (see "LTC/
Ref" on page 29) selects how that input signal will be used.
Timing (Horiz and Vert)
These two pull-downs allow output timing adjustment with reference to the Ref
Video source selected.
• Horizontal: The Horizontal reference can be adjusted by selecting a number of
pixels (clocks) to oset
• Vertical: The vertical reference can be adjusted by specifying a number of lines
to oset.