1.1 本实践的范围仅限于通过ASTM国际（ASTM）方法计算物体的颜色。实践 E308 涵盖了国际照明委员会（CIE）方法对物体颜色的计算。本实践提供了通过可能对需要自定义源定义或自定义观察者指定的用户有用的方法来计算颜色的方法。当使用相同的输入值时，通过CIE方法和通过ASTM方法导出的三刺激值将产生不显著的不同结果。 1.2 虽然本标准的标题将该方法称为“ASTM方法”，但这只是为了发布一个简短的名称，将该方法与实践方法区分开来 E308 ，在其标题中已经称为“CIE方法”。这两种方法都产生了完全符合CIE建议的三刺激值。 1.3 单位-- 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.4 本标准并不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====== 5.1 本标准中包含的实践对所有光源和观察者都是有用的，无论它们是标准CIE定义还是仅针对单一用途定制。 然而，开发这些方法是为了适应那些需要自定义源和观察者函数的用户。这些方法不便于计算三刺激积分的权重集，因此本文所包含的方法是专门为满足这些要求而开发的。因为任何一种方法都会导出彼此差异不大的三刺激值，所以它们之间唯一的选择标准是是否需要自定义函数。

1.1 The scope of this practice is limited to the calculation of colors of objects by the ASTM International (ASTM) method. Practice E308 covers calculation of colors of objects by the Commission Internationale de l’Éclairage (CIE) method. The present practice provides methods of calculation of colors by methods that may be useful to users who require custom source definitions, or custom observer designations. The tristimulus values derived by the CIE method and by the ASTM method will produce insignificantly different results when identical input values are used. 1.2 While the title of this standard refers to the method as the “ASTM method”, this is merely to promulgate a short name to distinguish this method from that of Practice E308 , already called in its title the “CIE method”. Both methods develop tristimulus values that are completely in compliance with CIE recommendations. 1.3 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 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 ====== 5.1 The practices contained in this standard are useful for all illuminants and observers whether they are standard CIE definitions or are custom to a single usage only. The methods were, however, developed to accommodate those users who have need for custom defined source and observer functions. These do not lend themselves to easy calculation of weight sets for tristimulus integration, and as such the methods contained herein were developed specially to accommodate those persons having this requirement. Because either method derives tristimulus values that are insignificantly different from each other, the only selection criterion between them is whether there is a need for custom functions or not.