ISO 11475:2017规定了用于测定纸张和纸板白度的程序。当在CIE D65日光标准光源下观看时，获得的值对应于带有或不带荧光增白剂的白纸和白板的视觉外观。它基于在整个可见光谱范围（VIS）内获得的反射率数据，而ISO亮度的测量仅限于VIS的蓝色区域。 此外，它还规定了一种调整UV含量的方法，以符合CIE D65日光光源[10][11]，只要存在荧光增白剂时获得的结果取决于落在样品上的辐射的UV含量。它特别适用于荧光增白剂（FWA）在可见光谱蓝色区域发射的白色荧光纸样品。 此方法不适用于含有荧光染料的彩色纸张。 ISO 11475:2017应与ISO 2469一起阅读。 注1:本文件基于CIE 15.3-2004[9]中发布的CIE白度公式。 注2:还发布了相关国际标准ISO 11476，规定了在室内照明条件下获得这些产品外观对应值的程序。

ISO 11475:2017 specifies the procedure to be used for determining the whiteness of papers and boards. The values obtained correspond to the visual appearance of white papers and boards with or without fluorescent whitening agents when they are viewed under the CIE D65 daylight standard illuminant. It is based on reflectance data obtained over the full visible spectral range (VIS) in contrast to the measurement of ISO brightness which is limited to the blue region of VIS. In addition, it specifies a method for adjustment of the UV content to correspond to the CIE D65 daylight illuminant[10][11], insofar as results obtained when fluorescent whitening agents are present are dependent upon the UV content of the radiation falling upon the sample. It is specific for white fluorescent paper samples where the emission due to the fluorescent whitening agent (FWA) occurs in the blue region of the visible spectrum. This method is not applicable to coloured papers containing fluorescent dyes. ISO 11475:2017 should be read in conjunction with ISO 2469. NOTE 1 This document is based on the CIE whiteness formula, published in CIE 15.3-2004[9]. NOTE 2 A related International Standard, ISO 11476, specifying the procedure for obtaining values corresponding to the appearance of these products under indoor illumination, has also been published.