本国际标准规定了半色调认证标准物质的要求，该标准物质可用于图形艺术用透射密度计或色度计的不透明面积百分比校准。 本国际标准不适用于按照ISO标准扩散密度校准透射密度计。 注:资料性附录A中给出了测定不透明面积百分比的试验方法。

This International Standard defines requirements for a half-tone certified reference material which may be used for the opaque area percentage calibration of transmission densitometers or colorimeters for use in the graphic arts. This International Standard is not applicable to the calibration of transmission densitometers in terms of ISO standard diffuse density. NOTE Test methods for determining the opaque area percentage are given in the informative annex A.