ViewSonic LS710HD User Manual page 53

Menu
Keystone
Description
Option
Adjust each corner to make a square
image when the projection surface is
not level.
Four Corners
H. Keystone Adjust image distortion horizontally.
V. Keystone
Adjust image distortion vertically.
Auto Keystone Automatically correct the keystone.
Return the Keystone settings to
Reset
default.
53
Description
NOTE: While adjusting the Four
Corners, the Aspect
Ratio, Edge Mask, Image
Shift, and Zoom menus
will be disabled. To
enable them, reset the
Keystone settings to
default.