What Is A Blend - Christie Entero RPMWU User Manual

Edge Blending
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 (available from the Test Pattern drop-
down) 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.
For information about advanced blending of complex configurations, for example with spherical screens, see
the Twist User Manual (P/N: 020-100143-xx) included in the user kit.

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 (Figure 3-13).
• 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 disappear
(Figure 3-14). 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 the 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.
• Edge Blending Controls
Use Edge Blending controls to set the precise
width, shape and midpoint you need to blend
overlapping edges together smoothly.
Entero RPMWU/RPMSP/RPMHD-LED01 User Manual
020-100367-05 Rev. 1 (06-2012)
Figure 3-13 Edge Blending
Figure 3-14 Edge Blending Concept
Section 3: Operation
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