Exposure

Exposure in video refers to the total amount of light captured by the camera sensor to produce an image. A correctly exposed image has a full tonal range: shadow areas contain visible detail (not crushed to pure black), highlight areas aren't clipped to pure white, and mid-tones fall at a natural brightness for the subject. An overexposed image is too bright, with highlights blown out and loss of detail in the brightest areas. An underexposed image is too dark, with shadows crushed and loss of detail in the darkest areas. The goal of exposure control is to capture the full dynamic range of a scene without sacrificing detail in either extreme.

Three camera settings control exposure: aperture (the size of the lens opening, which controls how much light passes through), shutter speed (how long the sensor is exposed to light for each frame), and ISO (the sensor's sensitivity to light). These three settings form the "exposure triangle," and they're interdependent — changing one requires adjusting the others to maintain correct exposure. In video, shutter speed is typically constrained to twice the frame rate (180-degree shutter angle rule) for natural motion blur, so aperture and ISO carry most of the exposure adjustment burden.

Modern cameras include exposure assistance tools — zebra patterns (which highlight overexposed areas with diagonal lines), waveform monitors (which display the luminance distribution across the frame), and histogram displays (which show the tonal range graphically). Professional videographers rely on these tools rather than their monitor display alone, since monitor brightness settings can mislead the eye. Correctly exposed footage is far easier to color grade in post and retains the detail in both highlights and shadows that post-production may need to work with.