Christie J Series User Manual page 94

Section 3: Operation
Step 3: Adjust Light Output in Eight Zones
a. For each screen, compare the light output of each edge and corner to that of the center. If any of the
areas differ, use the White Uniformity menu to match edges and corners to the center as described
below. Begin with the screen exhibiting the most obvious variations in light output.
• Adjust edge White Uniformity first—note that each edge adjustment also affects the rest of the
screen slightly. Keep all edges just slightly lower than the center light output rather than matching light
output precisely. Otherwise, it may not be possible to brighten the corners (typically the dimmest areas
of the screen) enough. i.e., the best uniformity is a compromise between the brightest and darkest areas
of the screen.
• Adjust corner White Uniformity last—each corner adjustment affects only this quadrant.
• Repeat for each screen.
Step 4: Readjust Color Temperature (level of red/green/blue) in Eight Zones
a. Return to Steps 2a & 2b and, if necessary, fine-tune the zones so that they all still exhibit a single color
temperature.
Cancelling Brightness Uniformity
If you do not want to use or apply Brightness Uniformity settings, delete the checkmark from the Uniformity
Enable check box at the top of the Brightness Uniformity menu.
EDGE BLENDING - Submenu
The Edge Blending submenu provides a range of controls for smoothing together the overlapping bright edges
of multiple adjacent projected images to create a single larger "seamless" image. These controls, which
primarily affect white levels, are typically used in conjunction with mechanical lens blinders (optional), which
are installed on the front of the projector and which primarily affect black levels. Brightness uniformity
adjustment, if desired, should be performed first. The Edge Blend or Grid Test Pattern is useful for the
mechanical setup of the projectors. If necessary, adjust Black Level Blending first with the Black test pattern,
then use the White test pattern to blend the white levels on the blend edges. The final step is to check the
blended image with an external source.There is a centerline (both horizontal and vertical) in the Edge Blending
test pattern. The intersection of these lines is the true center of the projector display area.
The Show Blending Overlap control enables or disables edge blending overlap. When enabled, this will make
the size of the Edge Blending regions obvious. This control should only be used during setup.
What is a Blend?
In simple terms, a blend appears as a gradient strip along an edge of a
projected image. It is darkest along the extreme edge of the image, and
lightens nearer to the rest of the image (see right).
How Are Blends Used?
In multiple-projector walls, complementary blends between neighboring
images can compensate for the extra "brightness" or intensity where these
edges overlap. By controlling blend width and other properties, you can
achieve uniformity across the group of images. Visible overlaps will
disappear, Figure 3-37 Edge Blending
3-44
Concept:
NOTE: Bottom defined by the slope.
F 3-36 E
IGURE
J Series 1000W and 1200W User Manual
020-100706-02 Rev. 1 (03-2014)
B
DGE LENDING