ISO-105-J05-2007.pdf

Reference number ISO 105-J05:2007(E) © ISO 2007 INTERNATIONAL STANDARD ISO 105-J05 First edition 2007-03-15 Textiles Tests for colour fastness Part J05: Method for the instrumental assessment of the colour inconstancy of a specimen with change in illuminant (CMCCON02) Textiles Essais de solidité des teintures Partie J05: Méthode d'évaluation instrumentale de la variation de nuance d'un échantillon en fonction de l'illuminant (CMCCON02) ISO 105-J05:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. 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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 2007 All rights reserved ISO 105-J05:2007(E) © ISO 2007 All rights reserved iii Foreword 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 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 closely 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. Draft 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 document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 105-J05 was prepared by Technical Committee ISO/TC 38, Textiles, Subcommittee SC 1, Tests for coloured textiles and colorants. ISO 105 was previously published in 13 “parts” under the general title Textiles Tests for colour fastness, 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-digit serial number (e.g. “Section A01”). A complete list of these parts is given in ISO 105-A01. -,-,- -,-,- INTERNATIONAL STANDARD ISO 105-J05:2007(E) © ISO 2007 All rights reserved 1 Textiles Tests for colour fastness Part J05: Method for the instrumental assessment of the colour inconstancy of a specimen with change in illuminant (CMCCON02) 1 Scope This part of ISO 105 provides a colorimetric method for calculating an estimate of the magnitude (and optionally the direction) of the change in the perceived colour of a textile specimen when the chromaticity of the illumination by which it is viewed is changed. It therefore provides an estimate of the colour inconstancy of the specimen. NOTE 1 Colour inconstancy and metamerism are related but distinct. With respect to a change in the quality of illumination, a) colour inconstancy is the extent of change in the colour appearance of a single specimen, b) metamerism is the extent of change in the colour difference between two specimens. This part of ISO 105 therefore provides a method for assessing (a) but not (b). NOTE 2 Comparison of the results of this method and those from visual assessments is valid only when the visual assessments are made a) in lighting of the same spectral power distributions as used in the colorimetric calculations, b) with the specimens illuminated at 1 000 lux to 4 000 lux, c) by an assessor who is fully adapted to the relevant viewing conditions. 2 Principle The tristimulus values (Xr, Yr, Zr and X, Y, Z respectively) of the specimen are measured or computed using CIE Standard Illuminant D65 as reference illuminant and an agreed test illuminant. All calculations are based upon the CIE 1964 Standard Colorimetric Observer. A chromatic adaptation transform (CAT02 simplified appropriately for the current application) is then applied to the tristimulus values in the test illuminant to determine the tristimulus values of the corresponding colour of the specimen in illuminant D65 (Xc, Yc, Zc). Finally, using the colour-difference formula specified in ISO 105-J03, the colour difference between the tristimulus values of the corresponding colour in illuminant D65 (Xc, Yc, Zc) and the measured or computed values in illuminant D65 (Xr, Yr, Zr) is calculated. This colour difference is the required Colour-Inconstancy Index, CMCCON02. NOTE 1 For further information on CMCCON02 and CAT02, see Reference 1 in the Bibliography. NOTE 2 The corresponding colour is the colour that would have the same appearance in illuminant D65 as it has in the test illuminant. -,-,- ISO 105-J05:2007(E) 2 © ISO 2007 All rights reserved 3 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 105-J01, Textiles Tests for colour fastness Part J01: General principles for measurement of surface colour ISO 105-J03, Textiles Tests for colour fastness Part J03: Calculation of colour differences 4 Procedure All tristimulus values in this part of ISO 105 shall be obtained using the CIE 1964 Standard Colorimetric Observer (10°). 4.1 Measure or calculate, as appropriate to the instrumentation and software available and in accordance with ISO 105-J01, the tristimulus values (Xr, Yr, Zr and X, Y, Z respectively) of the specimen in illuminant D65 and in the agreed test illuminant. 4.2 Calculate the RGB cone responses to the specimen (R, G, B) and the perfect reflecting diffuser (p.r.d.) (Rw, Gw, Bw), each under the test illuminant, and to the p.r.d. (Rwr, Gwr, Bwr) under illuminant D65: CAT02 ww wCAT02CAT02 ww wrwr wrCAT02 wrwr 0,732 80,429 60,162 4 100 where 0,703 61,697 50,0061 0,003 00,013 60,983 4 100 RX GY BZ RX G ZB RX G ZB = = = M MM M and Xwr, Zwr are the tristimulus values of the p.r.d. in illuminant D65 and Xw, Zw those of the p.r.d. in the test illuminant. The tristimulus values are normalized such that Yw and Ywr have values of 100. NOTE 1 Matrix MCAT02 is that defined in CAT02 2. NOTE 2 The Rw, Gw, and Bw are all positive for the common illuminants such as A, C, D55, D65, D75, F1 to F12. 4.3 Calculate the corresponding RGB cone responses: Rc = R(Rwr/Rw) Gc = G(Gwr/Gw) Bc = B(Bwr/Bw) 4.4 Calculate the tristimulus values of the corresponding colour in illuminant D65: cc 1 cCAT02c cc XR YG ZB = M 1 CAT02 1,0961240,278 8690,182 745 where 0,454 3690,473 5330,072 098 0,009 6280,005 6981,015 326 = M ISO 105-J05:2007(E) © ISO 2007 All rights reserved 3 This calculation shall be performed using the six decimal places shown in the reverse matrix 1 CAT02 M. If necessary, double precision arithmetic shall be used. 4.5 Calculate the colour difference between the colours represented by the tristimulus values of the corresponding colour in illuminant D65 (Xc, Yc, Zc) as batch and those measured or computed for the specimen in illuminant D65 (Xr, Yr, Zr) as standard according to ISO 105-J03. 5 Interpretation of results 5.1 The colour difference calculated in 4.5 is the required CMCCON02, which is a measure of the magnitude of the colour inconstancy of the specimen between the test illuminant and illuminant D65. If CMCCON02 is sensibly zero, the specimen is colour constant between these two illuminants. (This does not imply that it is necessarily colour constant between any other pair of illuminants.) The larger the value of CMCCON02, the more colour-inconstant is the specimen. 5.2 If desired, cylindrical component differences (L*, C* and H*) may be reported in order to indicate the nature and direction of the CMCCON02. 6 Test report The test report shall include the following: a) the number and year of publication of this part of ISO 105; b) all details necessary for complete identification of the specimen; c) identification of the colorimeter or spectrophotometer, including the CIE geometry type, with which the input data were obtained; d) the date of the test; e) identification of the test illuminant, e.g. illuminant A; f) the origin of the illuminant D65 and test illuminant weighting functions, e.g. ASTM E308-01 3; g) the colour-difference formula used to calculate the value of CMCCON02, e.g. CMC(1:1); h) the value of CMCCON02, e.g. CMCCON02 = 3,1; i) if desired, the components L*, C*, and H* of CMCCON02. ISO 105-J05:2007(E) 4 © ISO 2007 All rights reserved Annex A (informative) Test data and worked examples To help check computer programs giving CMCCON02, some representative test data and example calculations based thereon are given in Tables A.1 and A.2. Two green specimens, designated P and Q, are considered. Their reflectance values are given in Table A.1. Table A.1 Reflectance values for specimens P and Q P Q 400 17,38 14,63 420 18,58 16,90 440 22,67 20,68 460 25,53 26,47 480 26,63 33,03 500 26,57 33,25 520 26,02 28,69 540 25,84 24,11 560 25,68 20,97 580 23,57 19,09 600 19,77 18,42 620 15,48 21,40 640 11,71 23,57 660 17,13 30,36 680 35,61 45,92 700 58,92 63,26 All the following calculations have been made using the tables of weighting functions given in ASTM E308-01 3 for illuminants D65/10 and A/10 at 20 nm intervals with bandpass-correction. ISO 105-J05:2007(E) © ISO 2007 All rights reserved 5 Table A.2 Calculation of the corresponding colours using CAT02 and the colour inconstancy using CMCCON02 Perfect reflecting diffuser (p.r.d.) Specimen P Specimen Q Step 4.1 Xwr, Ywr, Zwr p.r.d. illuminant D65/10 94,81 100,00 107,31 Xw, Yw, Zw p.r.d. illuminant A/10 111,15 100,0035,20 Xr, Yr, Zr D65/10 20,29 23,91 25,47 20,51 24,09 26,14 X, Y, Z A/10 22,48 22,74 8,54 24,09 22,91 8,99 Step 4.2 R, G, B from X, Y, Z A/10 24,86 22,84 8,77 26,03 21,99 9,22 Rw, Gw, Bw from Xw, Yw, Zw D65/10 118,6991,76 36,31 Rwr, Gwr, Bwr from Xwr, Ywr, Zwr D65/10 95,01 103,70 107,17 Step 4.3 Rc, Gc, Bc 19,90 25,81 25,89 20,84 24,85 27,22 Step 4.4 Xc, Yc, Zc corresponding colour A to D65 19,35 23,13 25,95 20,88 23,20 27,30 Step 4.5 Standard = Xr, Yr, Zr 20,29 23,91 25,47 20,51 24,09 26,14 Batch = Xc, Yc, Zc 19,35 23,13 25,95 20,88 23,20 27,30 CMCCON02 DE CIELAB 2,61 6,72 CMCCON02 DE CMC(1:1) 2,48 6,27 The results clearly indicate that specimen P is much more constant than specimen Q. -,-,- ISO 105-J05:2007(E) 6 © ISO 2007 All rights reserved Bibliography 1 LUO, M.R., LI, C.J., HUNT, R.W.G., RIGG, B. and SMITH, K.J. CMC 2002 colour inconstancy index: CMCCON02, Coloration Technology, 119, 2003, pp. 280-285 2 CIE Publ. 159:2004, A Colour Appearance Model for Colour Management Systems: CIECAM02 3 ASTM International E308-01, Standard Practice for Computing the Colors of Objects by Using the CIE System, ASTM International, 100 Barr Harbor Drive, West Conshohocken, Philadelphia 19428 2951 (USA) -,-,- ISO 105-J05:2007(E) ICS 59.080.01 Price based on 6 pages © ISO 2007 All rights reserved -,-,-