CIE S 014-5 E-2009 Colorimetry - Part 5 CIE 1976 L u v Colour space and u- v- uniform chromaticity scale diagram (First Edtion).pdf

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1、 Reference numberISO 11664-5:2009(E)CIE S 014-5/E:2009ISO 2009INTERNATIONAL STANDARD ISO11664-5CIE S 014-5/EFirst edition2009-12-01Colorimetry Part 5: CIE 1976 L*u*v* Colour space and u, v uniform chromaticity scale diagram Colorimtrie Partie 5: Espace chromatique L*u*v* et diagramme de chromaticit

2、uniforme u, v CIE 1976 ISO 11664-5:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes 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 perform

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5、retariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2009 All 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 wri

6、ting from either ISO at the address below or ISOs member body in the country 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 reservedISO 11664

7、-5:2009(E) ISO 2009 All rights reserved iiiForeword 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

8、 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 Elect

9、rotechnical Commission (IEC) on all matters of electrotechnical standardization. ISO 11664-5 was prepared as Standard CIE S 014-5/E by the International Commission on Illumination, which has been recognized by the ISO Council as an international standardizing body. It was adopted by ISO under a spec

10、ial procedure which requires approval by at least 75 % of the member bodies casting a vote, and is published as a joint ISO/CIE edition. The International Commission on Illumination (abbreviated as CIE from its French title) is an organization devoted to international cooperation and exchange of inf

11、ormation among its member countries on all matters relating to the science and art of lighting. ISO 11664-5 was prepared by CIE Technical Committee 1-57 of division 1, Vision and colour. ISO 11664 consists of the following parts, under general title Colorimetry: Part 1: CIE standard colorimetric obs

12、ervers Part 2: CIE standard illuminants Part 4: CIE 1976 L*a*b* Colour space Part 5: CIE 1976 L*u*v* Colour space and u, v uniform chromaticity scale diagram ISO 11664-5:2009(E) iv ISO 2009 All rights reserved(Blank page)ISO 11664-5:2009(E) CIE S 014-5/E:2009 CIE 2009 All rights reserved ISO 2009 Al

13、l rights reserved vStandardCIE S 014-5/E:2009Colorimetry - Part 5: CIE 1976 L*u*v* Colour Space and u, v Uniform Chromaticity Scale Diagram Colorimtrie - Partie 5: Espace chromatique L*u*v* et diagramme de chromaticit uniforme u, v CIE 1976 Farbmessung - Teil 5: CIE 1976 L*u*v* Farbenraum und u, v e

14、mpfindungsgem gleichabstndige Farbtafel CIE Standards are copyrighted and shall not be reproduced in any form, entirely or partly, without the explicit agreement of the CIE. CIE Central Bureau, Vienna CIE S 014-5/E:2009 Kegelgasse 27, A-1030 Vienna, Austria UDC: 535.65:006 Descriptor: Standardisatio

15、n of colour measurement 535.643.2 Standard colorimetric systems ISO 11664-5:2009(E) CIE S 014-5/E:2009 vi CIE 2009 All rights reserved ISO 2009 All rights reserved CIE 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by an

16、y means, electronic or mechanical, including photocopying and microfilm, without permission in writing from CIE Central Bureau at the address below. CIE Central Bureau Kegelgasse 27 A-1030 Vienna Austria Tel.: +43 1 714 3187 0 Fax: +43 1 714 3187 18 e-mail: ciecbcie.co.at Web: www.cie.co.at ISO 1166

17、4-5:2009(E) CIE S 014-5/E:2009 CIE 2009 All rights reserved ISO 2009 All rights reserved viiFOREWORD Standards produced by the Commission Internationale de lEclairage (CIE) are a concise documentation of data defining aspects of light and lighting, for which international harmony requires such uniqu

18、e definition. CIE Standards are therefore a primary source of internationally accepted and agreed data, which can be taken, essentially unaltered, into universal standard systems. This CIE Standard has been prepared by the Technical Committee TC 1-57* of Division 1 “Vision and Colour“ and was approv

19、ed by the National Committees of the CIE. The following ISO and IEC committees and working groups co-operated in the preparation of this standard: IEC TC100/TA2 (Audio, Video and Multimedia Systems) ISO TC6 (Paper, Board and Pulps) ISO TC35/SC9/WG22 (Paint and Varnishes) ISO TC38/SC1/WG7 (Textiles)

20、ISO TC42 (Photography) ISO TC130 (Graphic Technology) ISO/IEC/JTC1/SC28 (Office Systems) * The chairperson of this TC was A.R. Robertson (CA), members were: P.J. Alessi (US), J.A. Bristow (SE), J. Campos Acosta (ES), R. Connelly (US), J.-F. Decarreau (FR), R. Harold (US), R. Hirschler (HU), H. Ikeda

21、 (JP), B. Jordan (CA), C. Kim (KR), D. McDowell (US), P. McGinley (AU), Y. Ohno (US), M.R. Pointer (GB), K. Richter (DE), G. Rsler (DE), J.D. Schanda (HU), R. Sve (FR), K. Smith (GB), K. Witt (DE), H. Yaguchi (JP), J. Zwinkels (CA). ISO 11664-5:2009(E) CIE S 014-5/E:2009 viii CIE 2009 All rights res

22、erved ISO 2009 All rights reservedTABLE OF CONTENTS FOREWORD vii INTRODUCTION 1 1. SCOPE 1 2. NORMATIVE REFERENCES 1 3. DEFINITIONS, SYMBOLS AND ABBREVIATIONS 2 4. CALCULATION METHOD 2 4.1 Uniform chromaticity scale diagram (UCS diagram) 4.2 Uniform colour space 3 4.3 Correlates of lightness, satura

23、tion, chroma and hue 4 4.4 Colour differences 4 ANNEX (INFORMATIVE): REVERSE TRANSFORMATION 6 BIBLIOGRAPHY 7 ISO 11664-5:2009(E) CIE S 014-5/E:2009 CIE 2009 All rights reserved ISO 2009 All rights reserved 1COLORIMETRY - PART 5: CIE 1976 L*u*v* COLOUR SPACE AND u, v UNIFORM CHROMATICITY SCALE DIAGRA

24、M INTRODUCTION The three-dimensional colour space produced by plotting CIE tristimulus values (X,Y,Z) in rectangular coordinates is not visually uniform, nor is the (x,y,Y) space nor the two-dimensional CIE (x,y) chromaticity diagram. Equal distances in these spaces and diagrams do not represent equ

25、ally perceptible differences between colour stimuli. For this reason, in 1976, the CIE introduced and recommended two new spaces (known as CIELAB and CIELUV) whose coordinates are non-linear functions of X, Y and Z. The recommendation was put forward in an attempt to unify the then very diverse prac

26、tice in uniform colour spaces and associated colour difference formulae (Robertson, 1990; CIE, 2004). Both these more-nearly uniform colour spaces have become well accepted and widely used. Numerical values representing approximately the relative magnitude of colour differences can be described by s

27、imple Euclidean distances in the spaces or by more sophisticated formulae that improve the correlation with the relative perceived size of differences. The purpose of this CIE Standard is to define procedures for calculating the coordinates of the CIE 1976 L*u*v* (CIELUV) colour space and the Euclid

28、ean colour difference values based on these coordinates. The standard also defines a related chromaticity diagram that is a projection of the CIE x,y diagram maintaining straight lines of dominant and complementary wavelengths. The standard does not cover the alternative uniform colour space, CIELAB

29、 (CIE, 2007), nor does it cover more sophisticated colour difference formulae based on CIELAB, such as the CMC formula (Clarke et al., 1984), the CIE94 formula (CIE, 1995), the DIN99 formula (DIN, 2001), and the CIEDE2000 formula (CIE, 2001). 1. SCOPE This CIE Standard specifies the method of calcul

30、ating the coordinates of the CIE 1976 L*u*v* colour space including correlates of lightness, chroma, saturation and hue. It includes two methods for calculating Euclidean distances in this space to represent the relative perceived magnitude of colour differences. It also specifies the method of calc

31、ulating the coordinates of the u,v uniform chromaticity scale diagram. The Standard is applicable to tristimulus values calculated using the colour-matching functions of the CIE 1931 standard colorimetric system or the CIE 1964 standard colorimetric system. The Standard may be used for the specifica

32、tion of colour stimuli perceived as belonging to a reflecting or transmitting object, where a three-dimensional space more uniform than tristimulus space is required. This includes self-luminous displays, like cathode ray tubes, if they are being used to simulate reflecting or transmitting objects a

33、nd if the stimuli are appropriately normalized. The Standard, as a whole, does not apply to colour stimuli perceived as belonging to an area that appears to be emitting light as a primary light source, or that appears to be specularly reflecting such light. Only the u,v chromaticity diagram defined

34、in Section 4.1 and the correlates of hue and saturation defined in Section 4.3 apply to such colour stimuli. 2. 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

35、, the latest edition of the referenced document (including any amendments) applies. CIE 17.4-1987. International Lighting Vocabulary (Joint publication IEC/CIE). ISO 11664-1/CIE S 014-1/E. Colorimetry Part 1: CIE Standard Colorimetric Observers (Joint Standard ISO/CIE). ISO 11664-2/CIE S 014-2/E. Co

36、lorimetry Part 2: CIE Standard Illuminants for Colorimetry (Joint Standard ISO/CIE). ISO 11664-5:2009(E) CIE S 014-5/E:2009 2 CIE 2009 All rights reserved ISO 2009 All rights reserved3. DEFINITIONS, SYMBOLS AND ABBREVIATIONS For the purposes of this Standard, the terms and definitions given in CIE 1

37、7.4-1987 (International Lighting Vocabulary), as amended by this Standard, and the following symbols and abbreviations apply. X, Y, Z tristimulus values of a test stimulus calculated using the colour-matching functions of the CIE 1931 standard colorimetric system (also known as the CIE 2 standard co

38、lorimetric system) Yntristimulus value, Y, of a specified white colour stimulus calculated using the colour-matching functions of the CIE 1931 standard colorimetric system x, y chromaticity coordinates of a test stimulus calculated using the colour-matching functions of the CIE 1931 standard colorim

39、etric system L* CIELUV lightness u*, v* CIELUV u*,v* coordinates u, v CIE 1976 chromaticity coordinates nu , CIE 1976 chromaticity coordinates of a specified white stimulus nvsuvCIELUV saturation Cuv* CIELUV chroma huvCIELUV hue angle (u,v) CIELUV chromaticity difference L* CIELUV lightness differen

40、ce u*, v* CIELUV u*,v* differences Cuv* CIELUV chroma difference huvCIELUV hue angle difference Huv* CIELUV hue difference Euv* CIELUV colour difference If the character “ is not available, it may be replaced by the character “D“. The phrase “CIE 1976 L*u*v*“ and the term “CIELUV“ may be used interc

41、hangeably. Where tristimulus values are calculated using the colour-matching functions of the CIE 1964 standard colorimetric system (also known as the CIE 10 standard colorimetric system), a subscript 10 shall be added to all the above symbols. 4. CALCULATION METHOD 4.1 Uniform chromaticity scale di

42、agram (UCS diagram) The CIE 1976 uniform chromaticity scale diagram is a projective transformation of the CIE x,y chromaticity diagram yielding perceptually more uniform colour spacing. It is produced by plotting, as abscissa and ordinate respectively, quantities defined by the equations: 4/( 15 3)u

43、XXYZ=+ (1) 9/( 15 3)vYXYZ=+ (2) where X,Y,Z are the tristimulus values of the test colour stimulus based on the CIE 1931 standard colorimetric system defined in ISO 11664-1/CIE S 014-1. The same quantities may be obtained by: 4/(2 12 3)uxxy=+ (3) 9/(2 12 3)vyxy=+ (4) where x and y are obtained by: /

44、( )x XXYZ=+ (5) ISO 11664-5:2009(E) CIE S 014-5/E:2009 CIE 2009 All rights reserved ISO 2009 All rights reserved 3/( )yYXYZ=+ (6) Euclidean distances in this diagram can be used to represent approximately the relative perceived magnitude of colour differences between colour stimuli of negligibly dif

45、ferent luminances, of approximately the same size, and viewed in identical surroundings, by an observer photopically adapted to a field with the chromaticity of CIE standard illuminant D65 defined in ISO 11664-2/CIE S 014-2. The values given by this Standard may not correlate well with relative perc

46、eived colour differences in other viewing conditions. The Euclidean distances are defined by: ()()1/ 222(,) uv u v=+00(7) where =uuu1 (8) =vvv1 (9) and the subscripts 0 (usually the reference) and 1 (usually the test) indicate the two stimuli being compared. 4.2 Uniform colour space The CIE 1976 L*u

47、*v* colour space is a three-dimensional, approximately uniform colour space produced by plotting in rectangular coordinates, L*, u*, v*, quantities defined by the equations:()=n* 116 / 16LfYY (10) = n*13*( )uLuu (11) = n*13*( )vLvv (12) where ()()1/3nn/fYY YY= if ( )3n/(6/29YY ) (13) () ( )/ (841/10

48、8) / 4/ 29fYY YY=+ if ( )3n/(6/29)YY (14) In these equations, Y, u and v describe the test colour stimulus and , and describe a specified white stimulus. nYnunvIn the case of simulated reflecting or transmitting objects produced on a self-luminous display, all the tristimulus values shall first be n

49、ormalized by the same factor so that Y would be equal to 100 for an object with 100 % reflectance or transmittance. If the angle subtended at the eye by the test stimulus is between about 1 and 4 the tristimulus values X, Y, Z calculated using the colour-matching functions of the CIE 1931 standard colorimetric system should be used. If this angular subtense is greater than 4 the tristimulus values X10, Y10