On a display or television monitor, black level is the technical term for what is usually called brightness . Black level determines the amount of light that a picture display emits for the darkest areas of an image. A PLUGE pattern is a test pattern used to calibrate the black level on a display monitor to that of a DVD player, a VCR, or some other source.
PLUGE pattern (picture line-up generation equipment pattern)
A PLUGE (picture line-up generation equipment) ...(WhatIs.com)
Grayscale is a range of shades of gray without ...(WhatIs.com)