Video gain (white level, white bar, reference white)

Video gain (white level, white bar, reference white)
A&V
The range of light-to-dark values of the image which are proportional to the voltage difference between the black and white voltage levels of the video signal. Expressed on the waveform monitor by the voltage level of the whitest whites in the active picture signal. Video gain is related to the contrast of the video image.

Audio and video glossary. 2014.

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