You may have searched for:
brighten, darken, darkness, highlight, lighten, lightness, overexposed, shadow, underexposed
A measure of the amount of light in which a photo was taken. Underexposed digital photos are too dark; overexposed ones, too light.

An overexposed image is too light overall (left). A properly exposed image with detailed highlight and shadow areas (center). An underexposed image is too dark overall (right).
Adobe Systems Incorporated