Adjusting The Image Geometry - Runco 3Dimension D-113d Installation & Operation Manual

Installation
Adjusting the Image Projector and/or screen placement — among other things — can cause geometric
Geometry distortion in the projected image.
To correct this, the DHD Controller provides precise, nine-point control over the projected
image geometry. Use these controls as (and only if) needed to re-position the image
corners, mid-points and center to eliminate "keystoning" (mis-aligned corners) or
"pincushion" distortion (mid-points not aligned with corners). See Figure 3-23.
Horizontal Keystoning
Vertical Keystoning
Pincushion Distortion
Figure 3-23. Keystone and Pincushion Distortion
"Keystoning" usually occurs when the projector is tilted relative to the screen. "Pincushion"
distortion can sometimes occur if the throw distance is very short and/or the projector is
equipped with an anamorphic lens.
54 D-113d Projection System Installation/Operation Manual