ASTM E3415-24 - Standard Practice for Calculating the Colors of Objects by Using the ASTM Method

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.