Song Zhiran, Huang Xiaoyuan, Song Jianming
Color.
2026, 44(2):
7-11.
"Iris color" serves as the smallest and most complex natural color unit of the human body. It is not only the product of the combined effects of biological genetics and optical structures, but also a crucial carrier of cultural aesthetics and identity. Focusing on the color gamut characteristics of iris color within the Chinese population, this study conducted empirical observations of 300 volunteers under Standard Illuminant D65. The findings confirm that the iris color of the Chinese population predominantly falls within the dark brown spectrum. The study employs a dual-layer transparent film overlay colorimetry method, alongside closely associated B-HLC four-dimensional parameter recording. Drawing methodological inspiration from the traditional Chinese "Jiugong" (nine-square grid) philosophy, this research establishes a framework to innovatively design a "Nine- Square Grid Iris Colorimetric Scale." This scale utilizes vertical and horizontal axes to categorize the cool-warm temperature of the hue and the high-low levels of lightness, thereby constructing a "nine-quadrant" color difference analytical model for iris color. This model effectively encompasses the iris color characteristics of the vast majority of the Chinese population, and by extension, East Asian populations. This research further advances and deepens existing Western iris color classification systems. Additionally, it pioneers a new research pathway for the study of "biological color," enriching the methodologies of fundamental color science research. The outcomes offer a valuable exploration into national image aesthetics, color applications in medical aesthetics, interdisciplinary color education theory, and the development of practical tools.