Christie Entero RPMWU Setup Guide download pdf (Page 30)

3-10 Entero RPMWU/RPMSP-LED01 Setup Guide

020-100445-01 Rev. 1 (12-2009)

Section 3: Operation

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 3-6).

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 3-7). 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.

Edge Blending Controls

Use Edge Blending controls to set the precise

width, shape and midpoint you need to blend overlapping edges together smoothly.

NOTE: For information about advanced blending of complex configurations, for example with spherical

screens, see the Twist User Manual included in the user kit.

• Blend Width

determines how much area is used for blending along an overlapping edge. Slide bar values

represent the number of pixels used for the blend. For example:

• A setting of 8 creates a blended edge 8 pixels wide.

• A setting of “0” signifies no blending.

For best results in most applications, use a blend width of 12-25% (for example with a screen size of

1920 × 1200, 230-480 pixels).

NOTE: Ranges: 0-960 horizontal, 0-60 vertical.

• Blend Shape

determines the rate of roll-off across the blend width, i.e. how quickly the white levels across

the blend change from light and dark. Increasing the Blend Shape setting accelerates the rate of change at

both extremes so that less of the region appears mid-gray. Decreasing the Blend Shape setting slows the rate

of change so that more of the region appears mid-gray. For most applications, this subtle control is best left

close to 50.

• Blend Midpoint determines the white level at the blend midpoint (the point equidistant between the

beginning and end of the blend). Increasing the Blend Midpoint setting creates a blend that appears brighter

than the rest of the image. Decreasing the Blend Midpoint setting creates a blend that is darker than the rest

of the image. A setting of 50 means the midpoint is approximately 50% black—for best results in most

applications, keep fairly close to this default.

• Show Blending Overlap

turns your defined blend width area to solid gray so that, if needed, simply

overlapping the gray bars can seamlessly align two adjacent images. Toggle the Show Blending Overlap off

to reactivate the blend effect.

FIGURE 3-6 EDGE BLENDING

FIGURE 3-7 EDGE BLENDING CONCEPT

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Christie Entero RPMWU Setup Guide Page 30

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