Glossary Of Photography Terms
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Luminance Luminance refers to the brightness or intensity of light emitted or reflected from a surface, as perceived by the human eye. In digital imaging and color science, luminance is one of the components of color representation, along with chrominance. Luminance represents the black-and-white information or brightness values in an image, while chrominance represents the color information or hue and saturation values.
Luminance is often measured in units such as candelas per square meter (cd/m²) or relative values on a scale from 0 to 100, with 0 representing absolute black and 100 representing the brightest white. In digital imaging, luminance values are typically represented in grayscale images or luminance channels of color images, where variations in luminance contribute to contrast, tonal range, and overall image brightness. |
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