通过与适当选择的参考标准进行比较，测量反射率或反射率系数。1969年，CIE建议将完美反射散流器作为理想标准。由于没有与完美扩散器相对应的现有材料，问题在于将参考真实物理标准进行的测量转换为相对于完美反射扩散器绝对值的测量。本报告的主要重点是进行转换的理论和程序，而不是材料、测量仪器或样品制备的特性。对于这些主题，读者可以参考原始论文。该文件由68页和12幅图组成。

Measurements of reflectance or reflectance factor are made by comparison to appropriately chosen reference standards. In 1969, the CIE recommended that the perfect reflecting diffuser be taken as the ideal standard. As there is no existing material which corresponds to the perfect diffuser, the problem is one of transforming measurements made with reference to real physical standards to those of absolute values relative to the perfect reflecting diffuser. The main emphasis of this report is on theory and procedures by which this conversion is made, not on properties of the materials, measuring instruments, or preparation of samples. For these topics, the reader is referred to original papers.The document consists of 68 pages and 12 figures.