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lightness, luminance

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lightness, luminance (In French clarté, luminance) luminance L in candela per square meter [cd/m²], strength of a light perception. Each color sensation is also associated with a lightness sensation, i.e. the luminance channel light–dark supplements the two chrominance channels red–green and blue–yellow, e.g. L* in the CIELAB/CIELCH color space model.