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Correcting keystoning
The normal projected image has a rectangular shape. A key-
stoned image has a trapezoidal shape (as illustrated below).
A normal vs.
a keystoned image
Keystoning occurs when the front of the projector is not per-
pendicular to the projection screen (the vertical plane) or
when the projector is not parallel to the floor (the horizontal
plane). Keystoning can also occur when the projector is tilt-
ed sideways.
To correct keystoning, make sure that the projector is at a
right angle to the projection screen.
To project images high enough for the entire audience to
view, the projector has a built-in 4.5˚ correction for keyston-
ing.
42 Detailed setup
Normal image Keystoned image