1.1 本规程描述了检测同色异谱和估计同色异色色差大小的视觉方法。 1.2 该实践仅限于考虑光源同色谱和观察者同色谱。这种做法不包括明显的角度样本。 1.3 该实践不提供基于光谱特性的仪器测量的同色谱指数的计算。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 4.1 变质颜色匹配是由于使用不同的着色剂（颜料、染料等）来实现相同的颜色匹配。通常，购买者要求颜色匹配是非金属的；这种做法允许在现场和实验室快速测试这一要求。如果由于成本或其他原因，不可能或不可行进行非金属匹配，则可能需要对同色谱进行一些限制。本实践中描述的估计同色异谱幅度的程序提供了评估这种限制有效性的方法。

1.1 This practice describes visual methods for detecting metamerism and for estimating the magnitude of a metameric color difference. 1.2 The practice is limited to the consideration of illuminant metamerism and observer metamerism. This practice does not cover gonioapparent samples. 1.3 This practice does not provide for the computation of indices of metamerism based upon instrumental measurement of spectral characteristics. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 Metameric color matches result from the use of different colorants (pigments, dyes, and the like) in achieving the same color match. Usually, the purchaser requires that the color match be nonmetameric; this practice permits this requirement to be quickly tested in both field and laboratory. Where nonmetameric matches are not possible or practicable, for cost or other reasons, some limitation of metamerism may be required. The procedures for estimating the magnitude of metamerism described in this practice provide methods for assessing the effectiveness of such limitation.