Hue Discrimination
The term hue discrimination is used to describe the change in wavelength that must be obtained in order for the eye to detect a shift in hue. An equation (l + delta l) defines the required wavelength adjustment that must take place. A less than two nanometer change in wavelength causes most spectral colors to appear to take on a different hue. However, for blue light and red light, a much larger wavelength shift must occur in order for a person to be able to identify a difference in hue.
Read more about this topic: Abney Effect
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