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ASTM E308-99

Historical Revision

Standard Practice for Computing the Colors of Objects by Using the CIE System

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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 object-color 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, Z 10 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.

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 according to Practice E 1164 with 1-, 5-, 10-, or 20-nm measurement interval.

1.5 Procedures are included for cases in which the spectral data are, and those in which they are not, corrected for bandpass dependence. For the uncorrected cases, it is assumed that the spectral bandpass of the instrument used to obtain the data was approximately equal to the measurement interval and was triangular in shape. These choices are believed to correspond to the most widely used industrial practice.

1.6 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 Test Method D 2244.

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 and health practices and determine the applicability of regulatory limitations prior to use.


SDO ASTM: ASTM International
Document Number E308
Publication Date Aug. 10, 2001
Language en - English
Page Count 32
Revision Level 99
Supercedes
Committee E12.04
Publish Date Document Id Type View
Aug. 1, 2022 E0308-22 Revision
June 1, 2018 E0308-18 Revision
May 1, 2017 E0308-17 Revision
April 1, 2015 E0308-15 Revision
Oct. 1, 2013 E0308-13 Revision
July 1, 2012 E0308-12 Revision
Dec. 1, 2008 E0308-08 Revision
Dec. 1, 2006 E0308-06 Revision
Aug. 10, 2001 E0308-99 Revision
Aug. 10, 2001 E0308-01 Revision