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The following equation is implemented:

$$Color\,purity = \frac{\sqrt{(x-x_{s})^{2}+(y-y_{s})^{2}}}{\sqrt{(x_{d}-x_{s})^{2}+(y_{d}-y_{s})^{2}}}\times100% $$

Where: x and y are the CIE coordinates of the entire spectrum. x_{s} and y_{s} are the CIE coordinates of the standard illuminants of white light. x_{d} and y_{d} are the CIE coordinates of the dominant wavelength.

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