From measured reflectance values, the Spectramagic software (available with our spectrophotometer) provided different colour parameters, including Munsell hue, value, and chroma.
We calculated the mean Munsell hue of a given chart from the average Munsell hues measured in its chips, using the appropriate partition of Munsell hue (10R = 10, 2.
plane was averaged from the measured chromatic coordinates of the colour chips with the same Munsell hue and chroma notation (that is, the locus refers to a central Munsell value).
Figure 2 shows the average and range of Munsell hue from the spectrophotometric measurements we performed on the chips of our 6 colour charts, against the tabulated Munsell hue notation provided by the charts.
2 that for JAPAN2001 the Munsell hue ranges overlap in some adjacent charts, such as 2.
The old soil-colour charts had a worse conformity between measured and tabulated Munsell hue than did the new ones (Fig.
As can be seen, the distribution of colours is quite regular, the lines of constant Munsell hue and contours of constant Munsell chroma defining a regularly spaced spider web (Melville and Atkinson 1985).