本标准补充了美国国家标准ANSI/NAPM 2.18和ANSI IT2。19.通过规定光谱条件，以确定三分量减色彩色胶片上摄影音频记录的感光特性，该胶片的记录由染料图像加银或金属盐组成。它不适用于仅由染料组成的记录的密度测量。本标准的条件适用于使用S-1 photosurface的音频再现系统。一般认为，用于摄影音频复制的其他类型的光表面不属于本标准的范围。本标准定义了一种实际条件，通过这种条件，预计将进行大多数密度测量。

This standard supplements American National Standards ANSI/NAPM 2.18 and ANSI IT2.19 by specifying spectral conditions suitable for determining the sensitometric characteristics of photographic audio records on three-component subtractive color films having records made up of dye images plus silver or a metallic salt. It does not apply to the density measurement of records composed of dyes only. The conditions of this standard are applicable to systems of audio reproduction using the S-1 photosurface. It is recognized that there are other types of photosurfaces used for photographic audio reproduction that do not fall within the scope of this standard. This standard defines a practical condition by means of which it is expected that most density measurements will be made.