Color purity calculator for a luminescence spectrum (1931)

Dominant wavelngth (nm)	x	y	xd	yd

Standard illuminants of white light	xs	ys	Color purity (%)
A B C D50 D55 D65 D75 D93 E F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 LED-B1 LED-B2 LED-B3 LED-B4 LED-B5 LED-BH1 LED-RGB1 LED-V1 LED-V2	0.31006	0.31616

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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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