AbstractTristimulus values were calculated for the 1964 observer and illuminant D65 for four theoretical specimens, with radiance factor data of 1‐nm bandpass width, by the CIE recommended procedure and used as accurate references. Tristimulus values were then calculated for the same four theoretical specimens with six sets of published weights, with radiance factors assumed to have a bandwidth equal to the measurement interval and the bandpass profile to be triangular. The difference of the wide bandwidth calculated tristimulus values from the reference tristimulus values was considered to be an error and was expressed as CIE L*a*b* color differenc
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