SANS 105-J03-2010 Textiles - Tests for colour fastness Part J03 Calculation of colour differences《纺织品 染色牢度试验 第J03部分：色差的计算》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

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3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-23027-2 SANS 105-J03:2010Edition 2ISO 105-J03:2009Edition 2SOUTH AFRICAN NATIONAL STANDARD Textiles Tests for colour fastness Part J03: Ca

4、lculation of colour differences This national standard is the identical implementation of ISO 105-J03: 2009 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +

5、27 12 428 7911 Fax: +27 12 344 1568 www.sabs.co.za SABS SANS 105-J03:2010 Edition 2 ISO 105-J03:2009 Edition 2 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS SC 38A, Textile test methods Coloured textiles the PDF-creation

6、parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2009 Al

7、l rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country

8、of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedSANS 105-J03:2010This s tandard may only be used and printed by approved subscription

9、and freemailing clients of the SABS .ISO 105-J03:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Principle1 3 Procedure.2 3.1 Calculation of CIELAB values 2 3.2 Calculation of CIELAB colour differences values3 3.3 Calculation of the CMC colour difference, Ecmc(l:c)4 4 Te

10、st report5 Annex A (informative) Interpretation of results .6 Annex B (informative) Representative test data 7 Annex C (informative) Computer program for calculating colour difference .8 Bibliography10 SANS 105-J03:2010This s tandard may only be used and printed by approved subscription and freemail

11、ing clients of the SABS .ISO 105-J03:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO

12、technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates clo

13、sely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Dra

14、ft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this docu

15、ment may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 105-J03 was prepared by Technical Committee ISO/TC 38, Textiles, Subcommittee SC 1, Tests for coloured textiles and colorants. This second edition cancels and replaces the f

16、irst edition (ISO 105-J03:1995), of which it constitutes a technical revision and incorporates ISO 105-J03:1995/Cor.1:1996 and ISO 105-J03:1995/Cor.2:2006. Subclause 3.1 has been replaced with the current CIE recommended form. The equations produce identical results, but the decimal numbers are repl

17、aced by fractions, so as not to limit precision. ISO 105 was previously published in thirteen “parts”, each designated by a letter (e.g. “Part A”), with publication dates between 1978 and 1985. Each part contained a series of “sections”, each designated by the respective part letter and by a two-dig

18、it serial number (e.g. “Section A01”). These sections are now being republished as separate documents, themselves designated “parts” but retaining their earlier alphanumeric designations. A complete list of these parts is given in ISO 105-A01. SANS 105-J03:2010This s tandard may only be used and pri

19、nted by approved subscription and freemailing clients of the SABS .INTERNATIONAL STANDARD ISO 105-J03:2009(E) ISO 2009 All rights reserved 1Textiles Tests for colour fastness Part J03: Calculation of colour differences 1 Scope This part of ISO 105 provides a method of calculating the colour differen

20、ce between two specimens of the same material, measured under the same conditions, such that the numerical value cmc(l:c) for the total colour difference quantifies the extent to which the two specimens do not match. It permits the specification of a maximum value (tolerance) which depends only on t

21、he closeness of match required for a given end-use and not on the colour involved, nor on the nature of the colour difference. The method also provides a means for establishing the ratio of differences in lightness to chroma and to hue. NOTE Annex A gives guidance on the interpretation of results. A

22、nnex B provides sample test data for use in checking computer programs. Annex C contains a sample computer program for calculating colour difference. 2 Principle The CIE1)1976 L*a*b* (CIELAB) colour space has been modified to enhance its visual uniformity when calculating the colour difference betwe

23、en two specimens. The modifications to CIELAB by the CMC equation provide a numerical value, cmc, which describes the colour difference between a sample and a reference in a more nearly uniform colour space. This permits the use of a single-number tolerance (“acceptability tolerance” or “pass/fail t

24、olerance”) for judging the acceptability of a colour match in which the tolerance is independent of the colour of the reference. The ellipsoid semi-axes (lSL, cScand SH) used to derive cmcprovide a means to interpret the three separate components of colour difference (lightness, chroma and hue) in m

25、anners suitable for a wide range of uses. The equation for cmcdescribes an ellipsoidal boundary (with axes in the directions of lightness, chroma and hue) centred about a reference. The agreed-upon cmcacceptability tolerance describes a volume within which all specimens are acceptable matches to the

26、 reference. The colour difference is composed of three components that comprise the differences between the reference and the specimen. These are as follows. a) A lightness component that is weighted by a lightness tolerance (L*/lSL). This is represented as Lcmc. If the Lcmcis positive, the specimen

27、 is lighter than the reference. If the Lcmcis negative, the specimen is darker than the reference; b) A chroma component that is weighted by the chroma tolerance (C*ab/cSc). This is represented as Ccmc. If the Ccmcis positive, the specimen is more chromatic than the reference. If the Ccmcis negative

28、, the specimen is less chromatic than the reference; 1) Commission Internationale de lclairage, Central Bureau, Kegelgasse 27, A-1030 Vienna, Austria. SANS 105-J03:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 105-J03:2009(E) 2 ISO

29、2009 All rights reservedc) A hue component that is weighted by the hue tolerance (H*ab/SH). This is represented as Hcmc. If the Hcmc is positive, the hue difference of the specimen is anti-clockwise from the reference in the CIELAB a*, b* diagram. If the Hcmcis negative, the hue difference of the sp

30、ecimen is clockwise from the reference in the CIELAB a*, b* diagram. 3 Procedure 3.1 Calculation of CIELAB values Calculate the CIELAB L*, a*, b*, C*ab, habvalues from the X, Y, Z tristimulus values for both the reference and specimen as follows: ()*116 16yLfQ=() ()* 500x yafQfQ=()()* 200yzbfQfQ=whe

31、re () () ()/; /; /x ny nz nQXXQYYQZZ= and ()1/ 3 3() if (6/29)ii ifQ Q Q= else ()3(841/108) 4/29 if (6/29)iifQ Q Q=+u where i varies as X, Y, and Z ()1/222ab*Cab=+ ()abarctan * / *hba= expressed on a 0 to 360 scale with the a* positive axis being 0 and the b* positive axis at 90. For these equations

32、, Xn, Ynand Znare the tristimulus values of the illuminant/observer combination in which it is desired to calculate CMC(l:c) colour differences. The preferred illuminant/observer combination is D65/10. Table 1 gives the values for this and five other combinations. SANS 105-J03:2010This s tandard may

33、 only be used and printed by approved subscription and freemailing clients of the SABS .ISO 105-J03:2009(E) ISO 2009 All rights reserved 3Table 1 Tristimulus values for six illuminant/observer combinations Tristimulus values Illuminant/observer combinations XnYnZnD65/10 94,811 100,00 107,304 D65/2 9

34、5,047 100,00 108,883 C/10 97,285 100,00 116,145 C/2 98,074 100,0 118,232 A/10 111,144 100,00 35,200 A/2 109,850 100,00 35,585 3.2 Calculation of CIELAB colour differences values Calculate the CIELAB colour differences L*, a*, b*, C*ab, E*ab, H*ab, using the following equations, in which the subscrip

35、ts R and S refer respectively to the reference and specimen CIELAB values: SR* *;L LL= SR* *;aa a= SR* *;bb b= ab ab,S ab,R* *;CC C= ()()()1/2222ab*;ELab=+()()()1/2222ab ab ab*HpqE L C= where 1if 0pm= W or 1if 0pm= where ab,S ab,Rmh h= in which . indicates that the positive value is to be used regar

36、dless of the sign of the expression between the two lines. SANS 105-J03:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 105-J03:2009(E) 4 ISO 2009 All rights reservedor the equivalent ()1/2ab ab,S ab,R S R S R*2* *HtCC aabb= where t =

37、 1 if a*S b*R u a*R b*Sor 1t = SR RSif * * * *ab ab 3.3 Calculation of the CMC colour difference, Ecmc(l:c) 3.3.1 The CMC colour difference is obtained from the following equation: ()( )()()1/2222cmc L ab c ab H:*/ */ */Elc LlS CcS H S=+ +Calculate the ellipsoid semi-axes from the L*R, C *ab,Rand th

38、e hab,Rof the reference as follows: ()LR RR0,040 975 * / 1 0,017 65 * if * 16SL LL=+ W or LR0,511 if * 16;SL=345 THEN 350 ELSE GOTO 360 350 T=.36+ABS(.4*COS(H1+35)/57.3):GOTO 370 360 T=.56+ABS(.2*COS(H1+168)/57.3) 370 SL=.040975*L1/(1+.01765*L1):IF L1180 THEN Y1=-1 ELSE Y1=1 386 Y2=Y1*DA:IF Y2=0 THE

39、N DH=-DH 390 DE=SQR(DL*DL+DC*DC+DH*DH) 400 RETURN SANS 105-J03:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 105-J03:2009(E) 10 ISO 2009 All rights reservedBibliography 1 CIE Publication 15:2004, Colorimetry, 3rd Edition SANS 105-J0

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