Textil Färghärdighetsprovning Del J03: Beräkning av färgskillnader (ISO 105-J03:2009)

SWE DIS H STAN DARD S

INS TITUTE

SVENSK STANDARD

SS-EN ISO 105-J03:2009

Fastställd/Approved: 2009-10-19 Publicerad/Published: 2009-11-10 Utgåva/Edition: 2

Språk/Language: engelska/English ICS: 59.080.01

Textil – Färghärdighetsprovning –

Del J03: Beräkning av färgskillnader (ISO 105-J03:2009) Textiles – Tests for colour fastness –

Part J03: Calculation of colour differences (ISO 105-J03:2009)

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Europastandarden EN ISO 105-J03:2009 gäller som svensk standard. Detta dokument innehåller den officiella engelska versionen av EN ISO 105-J03:2009.

Denna standard ersätter SS-EN ISO 105-J03, utgåva 1.

The European Standard EN ISO 105-J03:2009 has the status of a Swedish Standard. This document contains the official English version of EN ISO 105-J03:2009.

This standard supersedes the Swedish Standard SS-EN ISO 105-J03, edition 1.

Extract from the Foreword of ISO 105-J03:2009

This second edition cancels and replaces the first 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 replaced 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-digit 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.

This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-71493

This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-71493

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM

EN ISO 105-J03

October 2009

ICS 59.080.01 Supersedes EN ISO 105-J03:1997

English Version

Textiles - Tests for colour fastness - Part J03: Calculation of colour differences (ISO 105-J03:2009)

Textiles - Essais de solidité des teintures - Partie J03:

Calcul des écarts de couleur (ISO 105-J03:2009)

Textilien - Farbechtheitsprüfungen - Teil J03:

Berechnungen von Farbdifferenzen (ISO 105-J03:2009)

This European Standard was approved by CEN on 19 September 2009.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T É E U R O P É E N D E N O R M A L I S A T I O N E U R O P Ä I S C H E S K O M I T E E F Ü R N O R M U N G

Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.

Ref. No. EN ISO 105-J03:2009: E This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-71493

ISO 105-J03:2009(E)

© ISO 2009 – All rights reserved iii

Contents

Foreword ...iv

1 Scope ...1

2 Principle...1

3 Procedure ...2

3.1 Calculation of CIELAB values ...2

3.2 Calculation of CIELAB colour differences values...3

3.3 Calculation of the CMC colour difference, Ecmc(l:c)...4

4 Test report ...5

Annex A (informative) Interpretation of results ...6

Annex B (informative) Representative test data ...7

Annex C (informative) Computer program for calculating colour difference ...8

Bibliography...10

iii

SS-EN ISO 105-J03:2009 (E)This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-71493

EN ISO 105-J03:2009 (E)

3

Foreword

This document (EN ISO 105-J03:2009) has been prepared by Technical Committee ISO/TC 38 "Textiles" in collaboration with Technical Committee CEN/TC 248 “Textiles and textile products” the secretariat of which is held by BSI.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 2010, and conflicting national standards shall be withdrawn at the latest by April 2010.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 105-J03:1997.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

Endorsement notice

The text of ISO 105-J03:2009 has been approved by CEN as a EN ISO 105-J03:2009 without any modification.

iv

SS-EN ISO 105-J03:2009 (E)

This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-71493

This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-71493

© ISO 2009 – All rights reserved 1

Textiles — Tests for colour fastness — Part J03:

Calculation of colour differences

1 Scope

This part of ISO 105 provides a method of calculating the colour difference 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 the 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. Annex 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 between 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 tolerance”) for judging the acceptability of a colour match in which the tolerance is independent of the colour of the reference. The ellipsoid semi-axes (lS_L, cS_c and S_H) used to derive _cmc provide a means to interpret the three separate components of colour difference (lightness, chroma and hue) in manners suitable for a wide range of uses.

The equation for _cmc describes 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 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*/lS_L). This is represented as

Lcmc.

If the L_cmc is positive, the specimen is lighter than the reference. If the L_cmc is negative, the specimen is darker than the reference;

b) A chroma component that is weighted by the chroma tolerance (C*_ab/cS_c). This is represented as C_cmc. If the C_cmc is positive, the specimen is more chromatic than the reference. If the C_cmc is negative, the specimen is less chromatic than the reference;

1) Commission Internationale de l'Éclairage, Central Bureau, Kegelgasse 27, A-1030 Vienna, Austria.

SS-EN ISO 105-J03:2009 (E)

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ISO 105-J03:2009(E)

2 © ISO 2009 – All rights reserved

c) A hue component that is weighted by the hue tolerance (H*ab/SH).This is represented asHcmc.

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 H_cmcis negative, the hue difference of the specimen 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, h_ab values from the X, Y, Z tristimulus values for both the reference and specimen as follows:

( )

* 116 _y 16

L = f Q 

( ) ( )

* 500 _{x y}

a = f Q f Q

( ) ^{( )}

* 200 _{y z}

b = f Q  f Q

where

(

)

(

)

(

)

x n y n z n

Q = X X Q = Y Y Q = Z Z

and

( )

f Q = Q Q >

else

( )

f Q = Q + Q u

where

i varies as X, Y, and Z

(

)

*ab * *

C = a +b

( )

ab arctan * / *

h = b a expressed on a 0° to 360° scale with the a* positive axis being 0° and the b*

positive axis at 90°.

For these equations, X_n, Y_n and Z_n are 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.

SS-EN ISO 105-J03:2009 (E)This preview is downloaded from www.sis.se. Buy the entire standard via https://www.sis.se/std-71493

ISO 105-J03:2009(E)

© ISO 2009 – All rights reserved 3

Table 1 — Tristimulus values for six illuminant/observer combinations Tristimulus values

Illuminant/observer

combinations X_n Y_n Z_n

D65/10° 94,811 100,00 107,304

D65/2° 95,047 100,00 108,883

C/10° 97,285 100,00 116,145

C/2° 98,074 100,00 118,232

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 subscripts R and S refer respectively to the reference and specimen CIELAB values:

S R

* * * ;

L L L

 = 

S R

* * * ;

a a a

 = 

S R

* * * ;

b b b

 = 

ab ab,S ab,R

* * * ;

C C C

 = 

( ) (

) (

)

*ab * * * ;

E L a b

 =  +  +  

( ) (

)

( )

ab ab ab

* * * *

H pq E L C

 =       

where

1 if 0 p= mW

or

1 if 0 p=  m<

and q=1 if mu180 or

1 if 180 q=  m >

where m h= _ab,Sh_ab,R

in which ... indicates that the positive value is to be used regardless of the sign of the expression between the two lines.

SS-EN ISO 105-J03:2009 (E)

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