Kramer Electronics VP-790 - Manual (Page 16)

14 VP-790 Blending Images - Setting the Black Level Compensation
6 Setting the Black Level Compensation
Projectors usually output a small amount of light even when the image is black. If
the amount of light is called L, then on areas of the screen where only one projector
is showing its image you will have 1 x L, and where two projectors over-lap you will
have 2 x L.
In a dark room showing dark pictures on the screen you will be able to see the
patch-work effect.
The VP-790 lets you correct the difference in light leakage black level between
over-lapped and non-overlapped areas on the screen. To do so:
1. Select the Aspect Test pattern to clearly see the back image.
2. Select Multiunit and then select Black Level Uplift.
Figure 14: The Multiunit menu
3. Select Black Level Uplift.