Luminance is the measurable amount of light that is emitted, transmitted, or reflected from a surface or light source. It quantifies the brightness perceived by the human eye and is a critical factor in photography, videography, and display technologies.
Understanding luminance is important for photographers, cinematographers, and lighting professionals who need to control exposure, contrast, and visual perception in their images. Accurate measurement of luminance helps achieve balanced lighting, correct tonal reproduction, and consistent image quality across different media and viewing conditions.