A verification Study of NCS (Natural color system) Notation: Proposal of NCS Notation by use of the NCS Three Attribute Diagram

摘要

The NCS (Natural color system) is a color order system, which has been farther developed by Hard and his collaborators. NCS Notation is being discussed in the international standardization. This color notation is based entirely on the perception of color as a visual and qualitative phenomena. The ISO/TC187 domestic committee in Japan is continuing experiment on the validity of this NCS notation. I studied the NCS Three Attributes Diagram and used the NCS attributes (whiteness, blackness, and chromaticity). These three NCS attributes can be seen in the bar-graph scale, which measures the percentage of each attribute. The subjects in the experiment were requested to report their visual perception: how each color appeared in their perspective. The results of the experiments were based on the reported and calculated tests using the diagram of NCS notation.