Acer PD724 series - Manual (Page 26)

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User Controls
Image
(Computer / Video
Mode)
H. Keystone (Horizontal Keystone)
 Press the or button to adjust image distortion horizontally
and makes a squarer image.
V. Keystone (Vertical Keystone)
 Press the or button to adjust image distortion vertically
and makes a squarer image.
Aspect Ratio
Use this function to choose your desired aspect ratio.
 Auto :Keep the image with original width-higth ratio and
maximize the image to fit native horizontal or vertical
pixels.
 16:9 : The input source will be scaled to fit the width of the screen
and narrowed the height to make the displayed image
becomes 16:9 ratio.
 4:3 : The input source will be scaled to fit the projection screen
and becomes 4:3 ratio.
 1:1 : Keep image at the center of screen with its original pixel
resolution without scaling.
Projection
 Front-Desktop
The factory default setting.
 Front-Ceiling
When you select this function, the projector turns the
image 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.