Lightness

Lightness is a visual perception of the luminance of an object. It is often judged relative to a similarly lit object. In colorimetry and color appearance models, lightness is a prediction of how an illuminated color will appear to a standard observer.

While luminance is a linear measurement of light, lightness is a linear prediction of the human perception of that light.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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