hue

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The Ocean View software with which the samples were measured, gives us the parameters of color space CIE Lab and CIE XYZ, where the first indicates relationships of color, while the second indicates relations taking as starting point the colors that can be detected by the human eye.
The function which does this performs a RGB to CIE XYZ space conversion and then from there the CIE XYZ values are transformed to CIE Lab illuminant using illuminant D65.
Lab] in the CIE Lab color space using a transformation equation [20].
Since the colour conversions and binarizarion increase the computational cost, it can be reduced by choosing the linear conversions from the RGB space as the first attempts leaving CIE LAB colour model as the last one since this conversion requires more computations.