In television, picture line-up generation equipment (PLUGE or pluge) is equipment used to generate greyscale test patterns in order to adjust the black level and contrast of a picture monitor. Various PLUGE patterns can be generated, the most common consisting of three vertical bars of super-black, normal black, and near-black and two rectangles of mid-gray and white. These three PLUGE pulses are included in the SMPTE color bars (at the bottom and near the right) used for NTSC, PAL, and SÉCAM.
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