Black level is the light intensity of the darkest parts of a video image, serving as the reference point for how “black” appears on a display.
Black level is a critical calibration setting in video and display systems, establishing the baseline luminance a screen can reproduce. It directly influences contrast, image depth, and the clarity of darker regions in video content. If set too high, images appear washed out; if set too low, shadow details are lost. In commercial AV applications such as surveillance monitoring, digital signage, and control rooms, accurate black level calibration preserves fidelity with source signals and ensures visibility across the full brightness range. Display technologies vary in black level performance, with OLEDs offering deeper blacks than many LCDs, though calibration remains essential across all systems.
Black level standards and calibration guidelines are addressed by the Society of Motion Picture and Television Engineers (SMPTE) and the International Telecommunication Union (ITU).