NEC 40,000-Lumen 4K Laser Installation Projector - Manual (Page 85)

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4. Multi-Screen Projection
2. Select one option among nine by ▲ or ▼ .
Black Level Adjustment
This adjusts the black level of the overlapping area and the non-overlapping area of the multi-screen (EDGE BLENDING).
Adjust the brightness level if you feel the difference is too large.
NOTE:
Adjustable area varies depending on what combination of [TOP], [BOTTOM], [LEFT] and [RIGHT] are turned on.
The black level of the lower left projector is adjusted as shown in the figure.
CENTER
TOP
RIGHT
BORDER(TOP)
BORDER(RIGHT)
1. Select [DISPLAY] → [EDGE BLENDING] → [BLACK LEVEL] and press the ENTER button.
The screen will switch to the black level adjustment screen.