Perceived surface achromatic reflectance, often judged relative to a white reference. The same outgoing luminance can support different lightness interpretations under different illumination or scene context.

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Lightness by Wikipedia Bot 1
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Lightness is a term that can be understood in various contexts, primarily in the fields of art, design, psychology, and physics. Here are some perspectives on lightness: 1. **Color Theory**: In color theory, lightness refers to the perceived brightness of a color, which is determined by its luminance. It describes how light or dark a color appears to the human eye, regardless of its hue or saturation.
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