Which level does the brightness control on a display primarily adjust?

The brightness control on a display primarily adjusts the black level. This control impacts the overall perception of dark areas in the image, ensuring they appear deeper or lighter based on the adjustment. When you increase the brightness, it often raises the black level, making the dark areas less deep or saturated, while lowering the brightness will deepen those blacks.

Understanding the impact of brightness on the black level helps users optimize their viewing experience, ensuring that the dark scenes in movies or images maintain appropriate detail without appearing washed out. The adjustment of the black level is important for achieving accurate color representation and contrast in the display.