Determine Vertical And Horizontal Position - Christie Matrix StIM-WQ User Manual

Determine Vertical and Horizontal Position

The projection lens and the screen type determine the vertical and horizontal position of your
projector in relation to the screen. Ideally, you should position the projector perpendicular to the
screen to make the image appear rectangular instead of keystoned (trapezoidal). You can offset
vertical position of the image (move it above or below the optical axis) by adjusting the lens mount.
The type of projection lens you install determines the amount of available vertical offset. Vertical
offset can be expressed as the percent of half the image height or the number of pixels of shift from
lens center.
1. Offsets are subject to ±7% centering tolerance.
2. % offset is defined as:
The horizontal position of the image can also be offset (moved to the left or right of the optical
center) by adjusting the lens mount. The amount of horizontal offset available depends on the lens
installed and if the image has already been vertically offset. Horizontal offset can be expressed as the
percent of half the image width or the number of pixels of shift to one side of lens center.
1280 pixels
display to left
of lens center
0% Offset
In this example, no offset is applied.
Therefore, half of the image appears to the
left of lens center and half appears to the right.
Matrix StIM™ WQ/SIM WQ User Manual
020-100883-01 Rev. 2 (06-2013)
% Offset = # of pixels of offset
half vertical panel resolution
1280 pixels 640 pixels
display to right to left of
of lens center lens center
In this example, 50% offset is applied.
x 100
1920 pixels displayed to
right of lens center or 480 pixels
of shift to the right of lens center
50% Offset
Shaded area = projected area
Therefore, 3/4 or 75% of the image
appears to one side of the lens center.
Setup Procedures
11