Adjust The Image; Correct Keystone Effect; Correct Vignetting - Christie CP2215 User Manual

Adjust the Image

This section provides information and procedures for adjusting the projector image.

Correct Keystone Effect

Keystone effect occurs when you project an image onto the screen at an angle and the projector is
not centered on the screen. The image will appear distorted and resemble a trapezoid. This image
identifies horizontal (A) and vertical (B) keystone effect.
Horizontal keystone effect occurs when the projector is titled horizontally (left or right) to the screen.
Vertical keystone effect occurs when the projector is tilted vertically (forward or backward) to the
screen.
If the image suffers from slight keystone effect, you can correct it with electronic cropping.
If the keystone effect is severe, you can unevenly adjust the feet to compensate for projector tilt. It
is recommended that you use lens offset to align the center of the image to the center of the screen
before you correct the keystone effect.
If one side of the image is longer than another, see Adjust Tilt and Level the Projector on page 5.

Correct Vignetting

The term vignetting applies to an image that is brighter at the center than it is at the sides. If your
image suffers from vignetting, the lens has reached the end of its offset travel range. If your
installation does not allow the image to be centered with the center of the screen, move the entire
projector in the direction of lens travel.
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020-101225-01 Rev. 1 (01-2014)