Acer XD1170 - Manual (Page 24)

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User Controls
Keystone
Adjust image distortion caused by tilting projection. (±16 degrees)
Aspect Ratio
Use this function to choose your desired aspect ratio.
 Auto : Keep the image with original width-higth ratio and maxi
mize the image to fit native horizontal or vertical pixels.
 4:3 : The input source will be scaled to fit the projection screen
and becomes 4:3 ratio.
 16:9 : The input source will be scaled to fit the width of the screen
and narrowed the height to make the displayed image be-
comes 16:9 ratio.
Projection

Front-Desktop
The factory default setting.
 Front-Ceiling
When you select this function, the projector turns the im-
age upside down for ceiling-mounted projection.
 Rear-Desktop
When you select this function, the projector reverses the
image so you can project behind a translucent screen.

Rear-Ceiling
When you select this function, the projector reverses
and turns the image upside down at same time. You can
project from behind a translucent screen with ceiling
mounted projection.
Image
(Computer / Video
Mode)