ASTM-D2244 2002

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D2244-02e1 Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates

Published By	Publication Date	Number of Pages
ASTM	2002	10

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Categories: 17.180.20 - Colours and measurement of light, ASTM

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Description

ASTM D2244-02e1

Historical Standard: Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates

ASTM D2244

Scope

1.1 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), 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). The color differences based on Hunter L_H, a_H, b_H opponent-color space (6), or the Friele-MacAdam-Chickering (FMC-2) color space (7), are no longer recommended for industrial practice.

1.2 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.

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 requirements prior to use.

Keywords

color; color differences; color measurement

ICS Code

ICS Number Code 17.180.20 (Colours and measurement of light)

DOI: 10.1520/D2244-02E01

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Summary of Practice Significance and Use
3	Description of Color-Difference and Color-Tolerance Equations
4	FIG. 1
5	TABLE 1
6	Test Specimens Procedure Calculation Report
7	Precision and Bias Keywords A1. COLOR SPACES AND COLOR DIFFERENCE METRICS NO LONGER RECOMMENDED BUT STILL IN USE A1.1 A1.2 TABLE 2
8	X1. EXAMPLE CALCULATIONS FOR COLOR TOLERANCES EQUATION
10	REFERENCES

Additional information

Standard Title	D2244-02e1 Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
Published Code	ASTM
Publication Date	2002
Pages Count	10
ICS Codes	17.180.20 - Colours and measurement of light