We have already proposed a standard portrait for the assessment of preferable skin tone 1 . The present report describes a psychophysical experimental method, i.e., simultaneous triplet comparison that has been developed for the assessment of skin tone by using the portrait and that is characterized not only by a scalability, stability and reproducibility of the resulting scale values, but also by a reduced stress on observers. We have confirmed that the present simultaneous triplet comparison has a degree of scalability and stability almost equivalent to that of paired comparison that is most widely used for similar purposes, and that the stress on observers (expressed in terms of assessment time) is about half as much as that of paired comparison.
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