AJA KONA 4 PCI-E Video I/O Card (HDMI Output, Cable Included) - Manual (Page 38)

KONA Capture, Display, Convert v15.5 38 www.aja.com
Conversion Control
Format
The Format control shows the currently selected Conversion format. When the
Converson Format is different from the Device Format, a conversion will be
performed on the output, and the block diagram changes to reflect the new
processing.
The Conversion Formats available can vary based on what the Device Format is
and the input signal (frame rates of input sources limits the to/from conversion
choices). The pull-down menu lists all compatible formats for selection
(incompatible formats are not shown). This allows you to see what you’ve chosen,
and also see those formats that are compatible with the selected Device format.
Down
For down-conversion the following choices are available:
• Letterbox: image is reduced with black top and bottom added to image area
with the aspect ratio preserved
• Crop: image is cropped to fit new screen size
• Anamorphic: full-screen “stretched” image
Up
The Up and Down pull-down menus are available when conversion has been
selected for the video path to/from the framebuffer and identical frame rates are
selected (one exception is 1080PsF 23.98, which can be down-converted to 525i
29.97.) Different choices will be available depending on the type of conversion
and formats being converted. SD to SD conversions are essentially aspect ratio
conversions to accommodate transforming anamorphic images to letterbox or
vice versa.
For up-conversion the following choices are available:
• Anamorphic: full-screen “stretched” image
• Pillar box 4:3: results in a 4:3 image in center of screen with black sidebars
• Zoom 14:9: results in a 4:3 image zoomed slightly to fill a 14:9 image with black
sidebars
• Zoom Letterbox: results in image zoomed to fill full screen
• Zoom Wide: results in a combination of zoom and horizontal stretch to fill a
16:9 screen; this setting can introduce a small aspect ratio change
SD to SD
This pulldown is for SD to SD aspect ratio conversion.
• Letterbox: this transforms SD anamorphic material to a letterboxed image
• H Crop: will produce a horizontally stretched effect on the image; transforms
anamorphic SD to full frame SD
• Pillarbox: will produce an image in the center of the screen with black borders
on the left and right sides and an anamorphized image in the center
• V Crop: will transform SD letterbox material to an anamorphic image