Advanced Edge Blending - Submenu - Christie J Series User Manual

Section 3: Operation
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 Configura-
tion 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.

3.9.16Advanced Edge Blending - Submenu

Use Edge Blending controls to set the precise width, shape and midpoint you need to blend overlapping edges
together smoothly.
• Blend Width: Determines how much area is used for blending along an overlapping edge. Slide bar values
represent the number of pixel steps used for the blend. For example, a setting of "eight" creates a blended
edge 8 pixels wide.
A setting of "0" signifies no blending. For best results in most applications, use a blend width greater than
10% of the resolution of the projector (192 on a 1920 x 1080 projector). Larger blend widths can mask
uniformity issues between multiple projectors.
NOTE: Ranges: (Projector number of columns / 2) horizontal, (projector number of lines / 2) vertical.
Example: 1920 / 2 = 960 pixels horizontal, 1080 / 2 = 540 pixels 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-grey (see Figure 3.20). Decreasing the Blend Shape
setting slows the rate of change so that more of the region appears mid-grey. 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 grey so that, if needed, simply
overlapping the grey bars can seamlessly align two adjacent images. Toggle the Show Blending Overlap off
to reactivate the blend effect.
NOTE: Blending Overlap appears as Reserved when Christie TWIST is installed.
Other Functions
For convenience, the Edge Blending submenu also includes related options for enabling a specific color and/or
test pattern, or for working with colors or the lamp. Such functions duplicate those provided elsewhere in the
menu system.
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J Series 2.0, 2.4 and 3.0 kW User Manual
020-100707-03 Rev. 1 (02-2014)