Edge Blending - Submenu - Christie M Series User Manual

3.7.15Edge 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 center line (both horizontal and vertical) in the Edge
Blending test pattern. The intersection of these lines is the true center of the projector's 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, as shown in Figure 3-11 Edge Blending Concept.
For best results, use the same projector model
and type throughout your display wall. In
addition, avoid high-gain screens whenever
possible—the optical performance of such
screens demands minimal image offset, thus
projectors must be located very close to one
another.
Edge blending software controls are located in
the two-page Edge Blending submenu—
access via Configuration menu, then go to the
Geometry and Color menu and select Edge
Blending. The Advanced Edge Blending
option opens the second page of the Edge
Blending submenu.
M Series User Manual
020-100009-08 Rev. 1 (05-2013)
F 3-11 E B
IGURE DGE LENDING
Section 3: Operation
C
ONCEPT
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