Black Level Adjustment - Barco XDL-4K75 User Manual

8. GUI – Installation
8.5.2

Black level adjustment

About adjusting the black level
The purpose of the black level adjustment is to align the black levels in the overlapped regions with the black levels in the other
regions.
This is needed because the black levels will be brighter in the blend zones, since multiple projectors will project on the same screen
area.
The size of the black level area is calculated automatically from the blend zones. This is done by using the start position and size of
each edge of the blend and adding an additional size of 8 pixels to reduce the effect known as "sea of mirrors".
You can also specify the offsets manually by turning off the automatic calculation. The black level value is adjusted in a 8 bit resolution
from 0 to 255.
The following figure shows how this occurs in a side by side configuration without any correction of the black level.
Picture Left
Image 8-41
How to adjust the black level manually
1. In the main menu, select Installation → Blend and Mask → Black Level.
Image 8-42
Blend and Mask menu — Black Level
The Black Level menu is displayed.
Image 8-43
Black Level menu
2. Enable the Black level button. If you want a visual aid, enable the Show lines button as well.
3. Move the cursor to the side where the overlapped area occurs (left/right/top/bottom) and press enter.
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Blend Zone Picture Right
R5906151 XDL 17/04/2018