Gefen PRO I - Manual (Page 33)

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A/V CINEMA SCALER PRO - CONFIGURATION
The aspect ratio modes are listed below:
Full
Stretches the image to fi ll the screen
Overscan
Stretches the image to just beyond the border of the output
resolution (a portion of the image may be cropped)
Underscan
Stretches the image to just within the border of the output
resolution (a black border will appear around the outside edges)
Letterbox
Stretches the image to 16:9 aspect ratio without underscan
Panscan
Stretches the image to 4:3 aspect ratio without underscan
Please use the examples below do determine which aspect ratio mode should
be used. Please pay attention to the appearance of the circles. All circles
that appear as ovals will result in an output image that appears stretched/
Compressed.