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ASTM D 2244 Document Information:
Title
Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
ASTM International
Publication Date:
May 1, 2007
Scope:
This practice covers the calculation, from instrumentally
measured color coordinates based on daylight illumination, of color
tolerances and small color differences between opaque specimens
such as painted panels, plastic plaques, or textile swatches. Where
it is suspected that the specimens may be metameric, that is,
possess different spectral curves though visually alike in color,
Practice D 4086 should be used to verify instrumental results. The
tolerances and differences determined by these procedures are
expressed in terms of approximately uniform visual color perception
in CIE 1976 CIELAB opponent-color space
(1)2, CMC tolerance units
(2), CIE94 tolerance units (3),
the DIN99 color difference formula given in DIN 6176
(4), or the new CIEDE2000 color difference units
(5).
For product specification, the purchaser and the seller shall
agree upon the permissible color tolerance between test specimen
and reference and the procedure for calculating the color
tolerance. Each material and condition of use may require specific
color tolerances because other appearance factors, (for example,
specimen proximity, gloss, and texture), may affect the correlation
between the magnitude of a measured color difference and its
commercial acceptability.
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
requirements prior to use.
*A Summary of Changes section appears at the end of this
standard.
2 The boldface numbers in parentheses refer to the
list of references at the end of this standard.
Keywords:
- color
- color difference
- color metrics
- color spaces
- color tolerances
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