完美反射漫射体,也称为完美白光,是一种理论上的理想表面,在比色法和分光光度法中用作参考标准。其定义为能够 100% 反射可见光谱中所有波长的入射光,并实现完美漫反射(朗伯反射)的表面,这意味着其亮度在任何视角下都均匀一致。

(图片仅供参考)
完美反射漫射体,也称为完美白光,是一种理论上的理想表面,在比色法和分光光度法中用作参考标准。其定义为能够 100% 反射可见光谱中所有波长的入射光,并实现完美漫反射(朗伯反射)的表面,这意味着其亮度在任何视角下都均匀一致。
The Perfect Reflecting Diffuser (PRD) is a cornerstone concept in color science, serving as the ultimate benchmark for reflectance and whiteness. By definition, its spectral reflectance factor is unity (or 100%) for all wavelengths. This means it absorbs no light whatsoever. Furthermore, it exhibits Lambertian reflectance, meaning the reflected light intensity is proportional to the cosine of the angle between the observer’s line of sight and the surface normal. This ensures the surface appears equally bright regardless of the viewing angle. In the CIE XYZ color space, a PRD illuminated by an equal-energy illuminant (Illuminant E) would have tristimulus values X=Y=Z=100 and chromaticity coordinates x=y=z=1/3. Under any standard illuminant, its tristimulus values are numerically equal to those of the illuminant itself. For example, under CIE Illuminant D65, its Y value is 100, and its chromaticity coordinates (x, y) are those of D65. By definition, a PRD has a CIE Whiteness Index of 100. While a true PRD cannot be physically realized, materials like pressed barium sulfate (BaSO4) powder, polytetrafluoroethylene (PTFE, or Teflon), and various commercial materials like Spectralon are used as practical physical standards that closely approximate its properties, with reflectances often exceeding 99% across the visible spectrum.
完美反射扩散器(PRD)
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