From measured reflectance values, the Spectramagic software (available with our spectrophotometer) provided different colour parameters, including Munsell hue, value, and chroma.
The conformity between measured colour and Munsell hue, value, and chroma notation shown below each chip was first analysed.
Each point on the [a.sup.*][b.sup.*] 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).
Specifically, for the 10 soil samples the average standard deviation in our visual judgements was between 0.52 and 0.64 for Munsell value and chroma, and between 1.28 and 1.39 for Munsell hue.
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 2.5YR and 10R or 10R and 7.5R.
The old soil-colour charts had a worse conformity between measured and tabulated Munsell hue than did the new ones (Fig.