The Hue of a colour is related to its:

Key idea: Hue is the attribute of color that corresponds to its dominant wavelength in the spectrum of visible light.

• Hue: which color family is perceived (for example red, green, blue); for light this is set by wavelength.

• Saturation: how pure or vivid the color appears; not what the color actually is.

• Luminance (brightness/value): how light or dark the color appears.

• Incandescence: emission of light due to heat; a physical source of light rather than an attribute describing color.

Therefore, the hue of a colour is related to its wavelength (or the dominant spectral content), which determines the perceived color family.