Christie DS+5K User Manual page 93

Black Level Blending
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In applications where you are projecting only white or light images, the Blend Width
may be slightly higher—set according to how much overlap you have between
images. Use the following as a guide (examples show overlapping width only—values
for overlapping height will differ):
Recommended overlap is 12.5% - 25%
Similar to Edge Blending, Black Level Blending allows you to adjust the black level
'
hues of multiple adjacent projected images to create one large seamless display. Edge
blending must be enabled in order to use the Black Level Blending features.
Black Level Blending Procedure
NOTES: 1) Adjust white levels before adjusting black levels. 2) The zones in BLB
menu correspond to the Edge Blend zones. If a given Edge Blend zone width is set to 0
(i.e. no blend on that side) then the corresponding BLB zone is disabled. It only
becomes accessible when that Edge Blend zone is active.
1. Start with 2 projectors. Select the black test pattern for both projectors from the
Geometry and Color submenu.
2. In the Black Level Blending submenu, enable black blending by putting a
checkmark in the checkbox for each projector.
3. Working with one projector at a time, use the center brightness slide bar to
adjust the center brightness (brightness of the non-blended region) so that the
center intensity matches that of the brightest blended region (the center of all
images when blending a 2x2 display is the target area).
4. Use the following three color slide bars, Black Red Level, Black Green Level
and Black Blue Level, so the black hue of each projector matches.
5. You can choose which of the next four options, Top, Bottom, Left, Right, to
use depending on which edge of the projector you are working with has been edge
blended. The blend width can be adjusted to line up properly but by default it
corresponds to the edge blending setting determined for that edge.
Section 3: Operation
User's Manual 3-67
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