b) If the image is brighter at the center than it is at the sides, correct vignetting (on page
23).
c) If the image cannot be focused uniformly on the screen with a focus adjustment, or if a
large horizontal angular offset to the screen is required, adjust boresight (on page 24).
Correcting vignetting
An image that is brighter at the center than it is at the sides needs vignetting correction.
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.
Correcting the keystone effect
The keystone effect occurs when you project an image onto the screen at an angle and the projector is
not centered on the screen. As a result, the image appears distorted and resembles a trapezoid.
If the image suffers from slight keystone effect, it can be corrected with electronic cropping. If the
keystone effect is severe, complete a horizontal or vertical keystone adjustment.
Adjusting horizontal keystone
Use horizontal keystone to correct a keystoned image shape in which the left and right borders of the
image are unequal in length, and the top and bottom are slanted to one of the sides.
•
To correct the horizontal tilt of the projector, push the rear side of the projector left or right.
Adjusting vertical keystone
Use vertical keystone to correct a keystoned image shape in which the top and bottom borders of the
image are unequal in length, and both sides of the image are inclined toward the top or bottom edge.
•
To correct the vertical tilt of the projector, adjust the back feet up or down (on page 14).
Adjusting the image
CP2208-LP Installation and Setup Manual
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020-102152-03 Rev. 1 (05-2017)
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2017 Christie Digital Systems USA Inc. All rights reserved.
