Accuracy of Tristimulus Computations*

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Abstract
The methods used to compute tristimulus specifications are all approximate. In order to obtain information about the accuracy of the different weighted ordinate and selected ordinate methods, computed color values are compared for a number of reflecting surfaces and filters. The earlier data of Nickerson have been used for some of these comparisons. The only method, which determines the tristimulus specifications of all the samples studied with an uncertainty smaller than ½ jps (just perceptible steps), is the weighted ordinate method Δλ = 5 mµ. To calculate the tristimulus specifications with an uncertainty of ½ NBS unit, the weighted ordinate method Δλ = 10 mµ and the selected ordinate method N = 100 are accurate enough, but the selected ordinate method N = 30 must be rejected.

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