Single-number expressions of color differences among three pairs of samples of vegetable purées were calculated by eleven methods of computing ΔE. The samples differed mainly in chromaticity, and showed color differences more complex than simple nonmetameric ones. Experimental conditions were controlled by limiting the study to an analysis of the relative ability with which the eleven methods were able to rank the three pairs of samples. Serious discrepancies in magnitude and order were found.
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Angela Little (1963) studied this question.
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