DVIGear DVI-3571a - Manual (Page 14)

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The selection of the Video Menu or PC Menu is made automatically based on the
selected input signal. Please note the differences in the menu structure to the left.
The Display Menu allows user adjustment of several selections, such as output
resolution, size (aspect ratio), info display mode, input HDCP mode, and several
PC mode adjustments.
The Output Function allows you to specify the output resolution you want the
Switcher / Scaler to produce. For example, if you are using an HDMI display
that can only accept a 1080i HDTV input signal, set the output resolution of the
Switcher / Scaler to 1080i. Keep in mind that selecting an output resolution that
is not supported by your display can cause an apparent malfunction. Therefore,
be certain you know what resolutions your display device can accept BEFORE
making these menu selections. For best results, it is usually recommended to
set the unit’s output resolution to match the native resolution of the connected
display. Please consult your owner’s manual in order to determine your display’s
native resolution.
The Size Function has seven user selections: Letterbox, Overscan, Panscan,
Underscan (1 and 2), Full, and Follow Input. The Size function is used to alter
the Aspect Ratio of the output signal in order to achieve a desired format on the
display or destination device. The following are the menu selections for the Size
function and their effect:
Letterbox
Remaps the picture content to a letterbox format within the new resolution. Best
used to remap source content from 4:3 aspect ratio to 16:9.
Overscan
Remaps the picture content larger than the original image in order to reduce the
black bars at the top and bottom of a 16:9 letterbox source.
Panscan
Remaps the picture content to a smaller size than the output resolution and centers
the content in the middle of the image. Best used to remap source content from
letterbox or 16:9 aspect ratio to 4:3.
Underscan 1 Remaps the picture content to a smaller size than the output resolution.
Underscan 2 Remaps the picture content even smaller than the Underscan 1 setting.
Full
Remaps the picture content to full output resolution. This setting should be used
with high resolution data to maximize clarity.
Follow Input
Maintains the original aspect ratio of the source image relative to the selected
output resolution’s aspect ratio. For example, if a 4:3 source resolution (e.g.
640x480) is output to a 16:9 resolution (e.g. 1920x1080), then the image on the
display would be pillar-boxed with black bars to the left and right of the image.
On the other hand, if a 16:9 source image is output with a 4:3 resolution it will
letterbox the image with black bars above and below the image.
The Input HDCP Function allows the user to enable or disable HDCP capability
on the HDMI input ports.