Gao Cheng, Melgosa Manuel, Xiao Kaida, Pointer Michael R, Li Changjun
Opt Express. 2023 Jul 3;31(14):23702-23713. doi: 10.1364/OE.493856.
The domain and range of the CIECAM16 forward transformation was numerically determined and visualized for CIE standard illuminants, using a linear programming approach that provides the gamuts and colour solids for optimum colours. The effect of the surround, adapting luminance, and luminance of the background on the range of the CIECAM16 forward transformation were individually analyzed, showing that their ranges increased when the surround changed from dark to dim or average, the adapting luminance increased, or the luminance of the background decreased. The proposed methodology for the determination and visualization of the domain and range of the CIECAM16 forward transformation can be used for any illuminant, as well as for CIECAM02, CAM16, CAM02-UCS and CAM16-UCS. The findings of this paper not only solve the long-term unresolved domain and range problems of the CIE colour appearance models, but also find applications in cross-media colour reproduction. Furthermore, it was also found that some non-CIE colours are inside the International Color Consortium Profile Connection Space (ICC PCS), and some CIE colours are not included in that space.
采用线性规划方法，针对CIE标准光源，通过数值计算确定并可视化了CIECAM16正向变换的定义域和值域，该方法能为最佳颜色提供色域和颜色立体模型。分别分析了环境光、适应亮度和背景亮度对CIECAM16正向变换值域的影响，结果表明，当环境光从暗变为暗弱或平均亮度，适应亮度增加，或背景亮度降低时，它们的值域会增大。所提出的用于确定和可视化CIECAM16正向变换定义域和值域的方法可用于任何光源，以及CIECAM02、CAM16、CAM02-UCS和CAM16-UCS。本文的研究结果不仅解决了CIE颜色外观模型长期未解决的定义域和值域问题，还在跨媒体颜色再现中得到了应用。此外，还发现一些非CIE颜色位于国际色彩联盟配置文件连接空间（ICC PCS）内，而一些CIE颜色未包含在该空间中。
