ASTM-E313 › Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color Coordinates
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Scope
1.1 This practive provides numbers that correlate with visual ratings of yellowness or whiteness of white and near-white or colorless object-color specimens, viewed in daylight by an observer with normal color vision. White textiles, paints, and plastics are a few of the materials that can be described by the indices of yellowness or whiteness calculated by this practice.
1.2 For a complete analysis of object colors, by a specified observer and under a specified illuminant, use of three parameters is required. For near-white specimens, however, it is often useful to calculate single-number scales of yellowness or whiteness. This practice provides recommended equations for such scales and discusses their derivations and uses, and limits to their applicability (see also Ref (1)).
1.3 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 .
Keywords
color; colorimetric analysis; instrumental measurement, color/light; reflectance; reflectivity; whiteness indexes; yellowness indexes
To find similar documents by ASTM Volume:
06.01 (Paint -- Tests for Chemical, Physical, and Optical Properties; Appearance)
To find similar documents by classification:
17.180.20 (Colours and measurement of light)
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Document Number
ASTM-E0313-20
Revision Level
2020 EDITION
Status
Current
Modification Type
Revision
Publication Date
May 18, 2020
Document Type
Practice
Page Count
7 pages
Committee Number
E12.04