Christie Mirage M Series User Manual page 103

The Show Blending Overlap control enables or disables edge
blending overlap. When enabled, this makes the size of the Edge
Blending regions obvious. This control should only be used during
setup.
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 disappears, as shown below.
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 close to one another.
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 eight 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.
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, such as 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 image above). 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
Mirage M Series User Manual
020-101942-02 Rev. 1 (10-2018)
http://www.pureglare.com.au
Adjusting the image
103