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Hue

A hue refers to the gradation of color within the optical spectrum, or visible spectrum, of light. Hue may also refer to a particular color within this spectrum, as defined by its dominant wavelength, or the central tendency of its combined wavelengths. For example, a light wave with a central tendency within 565-590 nm will be yellow. In an RGB color space, hue can be thought of as an angle P in standard position. The other coordinates are saturation and brightness. 

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