In colorimetry, the Munsell color system is a color space that specifies colors based on three color dimensions: hue, value (lightness), and chroma (color purity). It was created by Professor Albert H. Munsell in the first decade of the 20th century and adopted by the USDA as the official color system for soil research in the 1930s.
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Value describes the darkness or lightness of a color. A color light in value has been diluted with white. For example, pink is a tint of red that has a light value, because of the white added to it.