ASTM D2244-2015 Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates《计算仪器测量颜色的颜色容差和色差的标准实践规程》.pdf
《ASTM D2244-2015 Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates《计算仪器测量颜色的颜色容差和色差的标准实践规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM D2244-2015 Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates《计算仪器测量颜色的颜色容差和色差的标准实践规程》.pdf(16页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D2244 14D2244 15Standard Practice forCalculation of Color Tolerances and Color Differences fromInstrumentally Measured Color Coordinates1This standard is issued under the fixed designation D2244; the number immediately following the designation indicates the year oforiginal adoption or,
2、 in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.INTROD
3、UCTIONThis practice originally resulted from the consolidation of a number of separately publishedmethods for the instrumental evaluation of color differences.As revised in 1979, it included four colorspaces in which color-scale values could be measured by instruments, many of which were obsolete,an
4、d the color differences calculated by ten equations for different color scales. The sections onapparatus, calibration standards and methods, and measurement procedures served little purpose in thelight of modern color-measurement technology. The revision published in 1993 omitted these sections,and
5、limited the color spaces and color-difference equations considered, to the three most widely usedin the paint and related coatings industry.Aprevious revision added two new color tolerance equationsand put two of the color difference equations from the 1993 version in an informative appendix forhist
6、orical purposes.1. Scope*1.1 This practice covers the calculation, from instrumentally measured color coordinates based on daylight illumination, ofcolor tolerances and small color differences between opaque specimens such as painted panels, plastic plaques, or textile swatches.Where it is suspected
7、 that the specimens may be metameric, that is, possess different spectral curves though visually alike in color,Practice D4086 should be used to verify instrumental results. The tolerances and differences determined by these procedures areexpressed in terms of approximately uniform visual color perc
8、eption in CIE 1976 CIELAB opponent-color space (1),2 CMCtolerance units (2), CIE94 tolerance units (3), the DIN99 color difference formula given in DIN 6176(4), or the new CIEDE2000color difference units (5).1.2 For product specification, the purchaser and the seller shall agree upon the permissible
9、 color tolerance between testspecimen and reference and the procedure for calculating the color tolerance. Each material and condition of use may requirespecific color tolerances because other appearance factors, (for example, specimen proximity, gloss, and texture), may affect thecorrelation betwee
10、n 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 responsibilityof the user of this standard to establish appropriate safety and health practices and det
11、ermine the applicability of regulatoryrequirements prior to use.2. Referenced Documents2.1 ASTM Standards:3D1729 Practice for Visual Appraisal of Colors and Color Differences of Diffusely-Illuminated Opaque MaterialsD4086 Practice for Visual Evaluation of MetamerismE284 Terminology of Appearance1 Th
12、is practice is under the jurisdiction of ASTM Committee E12 on Color and Appearance and is the direct responsibility of Subcommittee E12.04 on Color andAppearance Analysis.Current edition approved May 1, 2014Jan. 1, 2015. Published May 2014January 2015. Originally approved in 1964. Last previous edi
13、tion approved in 20112014 asD2244 11.D2244 14. DOI: 10.1520/D2244-14.10.1520/D2244-15.2 The boldface numbers in parentheses refer to the list of references at the end of this standard.3 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.
14、org. For Annual Book of ASTM Standardsvolume information, refer to the standardsstandards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version.
15、 Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section
16、appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1E308 Practice for Computing the Colors of Objects by Using the CIE SystemE805 Practice for Identification of Instrumental Methods of Color or Color-Dif
17、ference Measurement of MaterialsE1164 Practice for Obtaining Spectrometric Data for Object-Color Evaluation2.2 Other Standards:DIN 6176 Farbmetrische, Bestimmung von Farbabstnden bei Krperfarben nach der DIN99-Formel 43. Terminology3.1 Terms and definitions in Terminology E284 are applicable to this
18、 practice.3.2 Definitions of Terms Specific to This Standard:3.2.1 colorimetric spectrometer, nspectrometer, one component of which is a dispersive element (such as a prism, grating orinterference filter or wedge or tunable or discrete series of monochromatic sources), that is normally capable of pr
19、oducing as outputcolorimetric data (such as tristimulus values and derived color coordinates or indices of appearance attributes). Additionally, thecolorimetric spectrometer may also be able to report the underlying spectral data from which the colorimetric data were derived.3.2.1.1 DiscussionAt one
20、 time, UV-VIS analytical spectrophotometers were used for colorimetric measurements. Today, while instruments intendedfor use in color measurements share many common components, UV-VIS analytical spectrophotometers are designed to optimizetheir use in chemometric quantitative analysis, which require
21、s very precise spectral position and very narrow bandpass andmoderate baseline stability. Colorimetric spectrometers are designed to optimize their use as digital simulations of the visualcolorimeter or as the source of spectral and colorimetric information for computer-assisted color matching syste
22、ms. Digitalcolorimetry allows more tolerance on the spectral scale and spectral bandwidth but demand much more stability in the radiometricscale.3.2.2 color tolerance equation, na mathematical expression, derived from acceptability judgments, which distorts the metricof color space based on the coor
23、dinates in that color space, of a reference color, for the purpose of single number shade passing.3.2.2.1 DiscussionThe color tolerance equation computes a pass/fail value based on which of the pair of specimens is assigned the designation“standard.” Thus, inter-changing the reference and test speci
24、mens will result in a change in the predicted level of acceptancebetween the specimens while the perceived difference is unchanged.Acolor difference equation quantifies distance in a color spaceusing the metric of that space. Inter-changing the reference and test specimens does not change either the
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