Honeywell HD4D3S Configuration Manual page 8

EXPOSURE BLC (Backlight Compensation)
Backlight Compensation prevents
subjects in defined areas of the scene
from appearing too dark when
backlighting is present.
Select ON or OFF.
If ON is selected, you can adjust the BLC
level in five areas of the scene (top,
bottom, center, left, right).
Select a value from 0 to 255 for each area.
Increase the BLC level in the areas you
want to lighten.
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