CIE Chromaticity Diagram Plotting

The CIE chromaticity diagram serves as one of the most fundamental visualization tools in color science, providing an intuitive representation of the entire range of colors visible to the human eye. The standard diagram established by the International Commission on Illumination (CIE) in 1931 displays the classic horseshoe-shaped curve. Its construction requires spectral stimulus value data sampled at 1nm intervals from 360nm to 830nm to ensure precision.

In modern applications, the diagram typically incorporates two crucial overlay elements: First, color mappings based on the CIE1976 uniform color space, which better aligns with human visual perception characteristics. Second, gamut triangles representing video standards, including the BT709 standard for HDTV and BT2020 for ultra-high-definition displays.

Professional diagrams require annotation of key reference points, such as the coordinate position of the D65 standard white point. Such comprehensive chromaticity diagrams are particularly suitable for analyzing display device gamut coverage. By comparing different gamut triangles, one can clearly demonstrate the color range expansion of new display technologies (like quantum dot or OLED) compared to traditional technologies.