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» CIE 白度指数(W_CIE)

CIE 白度指数(W_CIE)

1986
  • International Commission on Illumination (CIE)
实验室技术员使用分光光度计测量CIE白度指数。.

(图片仅供参考)

CIE 白度指数是国际照明委员会制定的标准化公式,用于量化白度感知。它由样品和参考光源的 CIE 三刺激值 (X, Y, Z) 和色度坐标 (x, y) 计算得出。其主要公式为 [latex]W_{CIE} = Y + 800(x_n – x) + 1700(y_n – y)[/latex]。

The CIE Whiteness Index (W_CIE or W10 for the D65/10° observer) provides a single numerical value to represent how ‘white’ a material appears to a standard human observer under a specific illuminant. The formula, [latex]W_{CIE} = Y + 800(x_n – x) + 1700(y_n – y)[/latex], is based on the idea that whiteness is a combination of high lightness (represented by the tristimulus value Y) and a specific chromaticity, typically a slightly bluish hue. In the formula, (x, y) are the chromaticity coordinates of the sample, and (x_n, y_n) are those of the perfect diffuser under the same illuminant. The coefficients 800 and 1700 were empirically determined to correlate with visual assessments of whiteness. The formula is valid for a specific range of chromaticities close to the neutral point. A companion value, the Tint Index (T_W or T10), is often calculated as [latex]T_{W,10} = 1000(x_n – x) – 650(y_n – y)[/latex] to quantify the reddish or greenish deviation from a pure white. A positive T_W indicates a greenish tint, while a negative value indicates a reddish tint. The CIE standard specifies conditions for its use, including the illuminant (typically D65) and observer (2° or 10°). This index is crucial for industries where consistent appearance is vital, ensuring that products like paper, textiles, and plastics meet specific whiteness standards regardless of where they are manufactured or viewed.

UNESCO Nomenclature: 2209
- 光学

类型

抽象系统

中断

重大的

用法

广泛使用

前体

  • CIE 1931 XYZ 色彩空间
  • 分光光度法的发展
  • Gunter Wyszecki关于色差公式的研究
  • Judd、MacAdam 等人早期提出的白皙度公式

应用程序

  • 造纸质量控制
  • 纺织行业漂白和染料评估
  • 塑料和涂料配方
  • 油漆和颜料生产
  • 牙科材料比色

专利:

NA

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相关领域:白度指数、CIE、色度学、三刺激值、色度、D65 光源、造纸工业、纺织品质量、色彩科学、外观测量。

历史背景

CIE 白度指数(W_CIE)

1980
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1986
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2000

(如果日期未知或不相关,例如“流体力学”,则提供其显著出现的近似估计)

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