Acer GD711 User Manual page 29

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Keystone Adjusts image distortion caused by tilting projection.
Auto keystone
Off: Manually adjusts vertical image.
On: Automatically adjusts vertical image.
H. Keystone
Press the
and makes a squarer image.
V. Keystone
Press the
makes a squarer image.
4 Coner Correction
Manually adjusts the shape and size of an image that is unevenly
rectangular on all sides.Press four directional selection key to select the
cornerand then press "ENTER" key that you wish to adjust. Press four
directional selection keys to adjust the image shape.
Reset
Reset to defalut keystone setting.
Super Resolution Adjust the edges of the projected image in order to provide more
perceived details.
HDMI HDMI Color Range
Adjust the color range of the HDMI image data to correct color display
error.
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HDMI Scan Info
Adjust the overscan ratio of the HDMI image on screen.
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or button to adjust image distortion horizontally
or button to adjust image distortion vertically and
Auto: Automatically adjust by information from player.
Limited Range: Process the input image as limited color range
data.
Full Range: Process the input image as full color range data.
Auto: Automatically adjust by information from player.
Underscan: Always no overscan on HDMI image.
Overscan: Always keep overscan on HDMI image.