Acer P1320W - Manual (Page 34)

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Rear: When you select this function, the projector reverses the
image so you can project from behind a translucent screen.
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Rear-Ceiling: When you select this function, the projector
reverses and inverts the image at same time. You can project
from behind a translucent screen with ceiling mounted
projection.
Aspect Ratio Use this function to choose your desired aspect ratio.
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Auto: Keep the image with original width-higth ratio and
maximize the image to fit native horizontal or vertical pixels.
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Full: Keep the image with its original resolution, and resized to
fit within the display area.
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4:3: The image will be scaled to fit the screen and displayed
using a 4:3 ratio.
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16:9: The image will be scaled to fit the width of the screen and
the height adjusted to display the image using a 16:9 ratio.
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L.Box: Keep original signal aspect ratio and zoom in by 1.333
times.
Keystone Adjust image distortion caused by tilting the projector (±40 degrees).
Sharpeness Adjusts the sharpness of the image.
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Press to decrease the sharpness.
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Press to increase the sharpness.
H. Position
(horizontal
position)
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Press to move the image left.
•
Press to to move the image right.
V. Position (vertical
position)
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Press to move the image down.
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Press to move the image up.
Frequency Frequency changes the projector's refresh rate to match the
frequency of your computer’s graphics card. If you can see a vertical
flickering bar in the projected image, use this function to make the
necessary adjustments.
Tracking Synchronizes the signal timing of the projector with the graphics
card. If you experience an unstable or flickering image, use this
function to correct it.