ASTM E308-22
Standard Practice for Computing the Colors of Objects by Using the CIE System

Standard No.

ASTM E308-22

Release Date

2022

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM E308-22

Scope

1.1 This practice provides the values and practical computation procedures needed to obtain CIE tristimulus values from spectral reflectance, transmittance, or radiance data for objectcolor specimens. 1.2 Procedures and tables of standard values are given for computing from spectral measurements the CIE tristimulus values X, Y, Z, and chromaticity coordinates x, y for the CIE 1931 standard observer and X10, Y10, Z10 and x10. y10 for the CIE 1964 supplementary standard observer. 1.3 Standard values are included for the spectral power of six CIE standard illuminants and three CIE recommended fluorescent illuminants. Weight sets are included for tristimulus integration of nine standard or recommended CIE LED illuminants combined with the two standard CIE observers. 1.4 Procedures are included for cases in which data are available only in more limited wavelength ranges than those recommended, or for a measurement interval wider than that recommended by the CIE. This practice is applicable to spectral data obtained in accordance with Practice E1164 with 1-, 5-, 10-, or 20-nm measurement interval. 1.5 This practice includes procedures for conversion of results to color spaces that are part of the CIE system, such as CIELAB and CIELUV (3). Equations for calculating color differences in these and other systems are given in Practice D2244. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 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. 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the 1 This practice is under the jurisdiction of ASTM Committee E12 on Color and Appearance and is the direct responsibility of Subcommittee E12.04 on Color and Appearance Analysis. Current edition approved Aug. 1, 2022. Published August 2022. Originally approved in 1966. Last previous edition approved in 2018 as E308 – 18. DOI: 10.1520/E0308-22. 2 The boldface numbers in parentheses refer to the list of references at the end of this practice. Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States 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. 1 Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM E308-22 Referenced Document

• ASTM D2244 Standard Test Method for Calculation of Color Differences From Instrumentally Measured Color Coordinates
• ASTM E1164 Standard Practice for Obtaining Spectrophotometric Data for Object-Color Evaluation
• ASTM E2022 Standard Practice for Calculation of Weighting Factors for Tristimulus Integration
• ASTM E2729 Standard Practice for Rectification of Spectrophotometric Bandpass Differences
• ASTM E284 Standard Terminology of Appearance
• ASTM E313 Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color Coordinates

ASTM E308-22 history

• 2022 ASTM E308-22 Standard Practice for Computing the Colors of Objects by Using the CIE System
• 2018 ASTM E308-18 Standard Practice for Computing the Colors of Objects by Using the CIE System
• 2017 ASTM E308-17 Standard Practice for Computing the Colors of Objects by Using the CIE System
• 2015 ASTM E308-15 Standard Practice for Computing the Colors of Objects by Using the CIE System
• 2013 ASTM E308-13 Standard Practice for Computing the Colors of Objects by Using the CIE System
• 2012 ASTM E308-12 Standard Practice for Computing the Colors of Objects by Using the CIE System
• 2008 ASTM E308-08 Standard Practice for Computing the Colors of Objects by Using the CIE System
• 2006 ASTM E308-06 Standard Practice for Computing the Colors of Objects by Using the CIE System
• 2001 ASTM E308-01 Standard Practice for Computing the Colors of Objects by Using the CIE System
• 1999 ASTM E308-99 Standard Practice for Computing the Colors of Objects by Using the CIE System