Colour predictions with soilspec package

 The soilspec package comes with a data set called specSoilCol, which has 12 spectra of four types (A, B, C and D) of soils at three deferent depthss (Horizons 1, 2 and 3). 

The spectra is a Reflectance scale:

Now we use the function spectra2colour in the soilspec package and we obtain the predicted colours for the 12 samples that we have to compare with the real colours of the samples.

Normally the soil in the Horizon 1 is darker due to a higher quantity of organic matter.