ISO IEC TR 24705-2005 Information technology - Office machines - Machines for colour image reproduction - Method of specifying image reproduction of colour devi.pdf

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1、 Reference number ISO/IEC TR 24705:2005(E) ISO/IEC 2005TECHNICAL REPORT ISO/IEC TR 24705 First edition 2005-10-15Information technology Office machines Machines for colour image reproduction Method of specifying image reproduction of colour devices by digital and analog test charts Technologies de l

2、information Machines de bureau Machines pour reproduction dimage couleur Mthode pour spcifier la reproduction dimage des dispositifs couleur par des organigrammes dessai numriques et analogiques ISO/IEC TR 24705:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with

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5、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. ISO/IEC 2005 All rights reserved. Unless otherwise specified, no part of this publicat

6、ion 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 of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 2

7、0 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/IEC 2005 All rights reservedISO/IEC TR 24705:2005(E) ISO/IEC 2005 All rights reserved iii Information technology Ofce machines Machines for colour image reproduction Method of speci

8、fying image reproduction of colour devices by digital and analog test charts Contents Page Foreword. v Introduction . vi 1. Scope 1 2. Normative References . 1 3. Terms and denitions 2 3.1 Denitions 2 3.2 Colours in colour metrics, printing and television . 5 4. ISO/IEC-test charts 6 4.1 General 6 4

9、.2 Content and purpose of ISO/IEC-test charts . 6 4.3 Modes and production of ISO/IEC-test charts . 12 4.4 Codes of the ISO/IEC-test charts and their reproduction 14 4.5 Colorimetric data of intended and reproduced colours 15 4.6 Limits of visual resolution and colour perceptibility 21 4.7 Applicati

10、ons of analog and digital ISO/IEC-test charts 22 5. Visual and colorimetric tests for all applications . 24 5.1 General 24 5.2 Visual test 24 5.3 Colorimetric specication . 25 6. Test report for all applications 25 6.1 General 25 6.2 Description of input and output and comparison of output and refer

11、ence . 25 7. Test charts for image reproduction of printer systems: “digital analog” 26 7.1 General 26 7.2 Output technique for colour image reproduction devices: “digital analog” (printers) . 26 7.3 Parameters for the PS-output of colour image reproduction devices: “digital analog” . 28 7.4 Paramet

12、ers for the creation and output of PDF-les 28 8. Visual and colorimetric tests of printer systems: “digital analog” 29 8.1 General 29 8.2 Visual test 29 8.3 Colorimetric specication . 29 9. Test report of printer systems: “digital analog” . 29 9.1 General 29 10. Test charts for image reproduction of

13、 scanner systems: “analog digital” 30 10.1 General 30 10.2 Output technique for colour image reproduction devices: “analog digital” (scanners) . 30 10.3 Methods to determine the *coordinates of the digital scanner-test chart 34 11. Visual and colorimetric test of scanner systems: “analog digital” 38

14、 11.1 General 38 11.2 Visual test 38 11.3 Colorimetric specication . 38 12. Test report of scanner systems: “analog digital” 38 12.1 General 38 13. Test charts for image reproduction of monitor systems: “digital analog” 40 13.1 General 40 13.2 Output technique for colour image reproduction devices:

15、“digital analog” (monitors) . 40 13.3 Parameters for the PS-output of colour image reproduction devices: “digital analog” . 42 13.4 Parameters for the creation and output of PDF-les 42ISO/IEC TR 24705:2005(E) iv ISO/IEC 2005 - All rights reserved 14. Visual and colorimetric test of monitor systems:

16、“digital analog” 43 14.1 General 43 14.2 Visual test 43 14.3 Colorimetric specication . 43 15. Test report of monitor systems: “digital analog” . 43 15.1 General 43 Annex A: Form A for the picture area . 44 Annex B: Form B for the picture area . 45 Annex C: Form C for the picture area . 46 Annex D:

17、Form D for the picture area . 47 Annex E: Form E for the frame area 48 Annex F: Form F for the frame area 49 Annex G: Colorimetric specification . 50 Annex H: Code lists of input, output and reference 53 Annex I: Digital ISO/IEC-test charts of this Technical Report 55 Annex J: Colorimetric basis for

18、 the Systems OLS and TLS . 60 Annex K: Offset Luminous System for L*N = 0, 18, 27, 33 63 Annex L: Colours of Offset and Television Luminous Systems 65 Annex M: 16-step CIELAB scales and luminance reflectance 70 Annex N: Information on web sites . 71ISO/IEC TR 24705:2005(E)ISO/IEC 2005 - All rights r

19、eserved v Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards thro

20、ugh technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also

21、 take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prep

22、are International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. In exceptional circumstances, the joint

23、 technical committee may propose the publication of a Technical Report of one of the following types: type 1, when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts; type 2, when the subject is still under technical development or wher

24、e for any other reason there is the future but not immediate possibility of an agreement on an International Standard; type 3, when the joint technical committee has collected data of a different kind from that which is normally published as an International Standard (“state of the art”, for example

25、). Technical Reports of types 1 and 2 are subject to review within three years of publication, to decide whether they can be transformed into International Standards. Technical Reports of type 3 do not necessarily have to be reviewed until the data they provide are considered to be no longer valid o

26、r useful. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC TR 24705, which is a Technical Report of type 3, was prepared by Joint Tech

27、nical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 28, Office equipment. This Technical Report is based on International Standard ISO/IEC 15775 and on the Draft International Multipart ISO/IEC fast track Standard DIS 198391 to 4:2001 which together are identical to the multipart

28、standard DIN 33866-1 to -5. In 2002 it was decided at the Ballot Resolution Meeting on DIS ISO/IEC 19839-1 to -4 in Berlin to produce this Technical Report instead of a multipart International Standard. ISO/IEC TR 24705:2005(E) vi ISO/IEC 2005 - All rights reserved Introduction Background Informatio

29、n This Technical Report is based on analog ISO/IEC-test charts with 16-step colour scales equally spaced in CIELAB. The International Standard ISO/IEC 15775 for the specication of image reproduction of colour copiers uses analog ISO/IEC-test charts with e. g. a 16 step colour scale between White W a

30、nd Cyan-blue C which is equally spaced in CIELAB. In image technology for the output of the colour series W C the four device coordinates cmyk (Cyan-blue, Magenta- red, Y ellow, Black) have been used for many years. If the coordinate of Cyan-blue is changed between zero and 1 and the other three are

31、 zero then the series W C appears on the output, e. g. on an ofce colour laser printer or in offset printing. Linear relation between device and CIELAB coordinates for ofce systems There is much discussion in the eld of image technology about the meaning of device coordinates, e. g. cmyk or rgb, for

32、 printers and monitors and their relation to the L*a*b* data of the device independent colour space CIELAB. The International Standard ISO/IEC 15775 has produced new ideas how to dene more meaningful device coordinates which are called e. g. cmy0*, w*, olv*, 000n*. This Technical Report denes the ca

33、lculation methods between the CIELAB coordinates L*a*b* of the analog ISO/IEC-test charts and device *-coordinates (star- coordinates), e. g. cmy0*, w*, olv*, 000n*. According to the International Technical Report ISO/IEC TR 19797 a linear relationship can be dened between e.g. the device coordinate

34、s cmy0* and the device independent coordinates LAB* of the (absolute) CIELAB space. According to TR ISO/IEC 19797 the coordinate c* = 1 produces the Cyan-blue colour if the others are zero, c* = 0 produces the White reference paper and c* = 0,5 produces a colour which is exactly in the middle in the

35、 CIELAB space between Cyan-blue C and White W. The CIELAB data of the 16-step colour series between White and Cyan- blue are calculated by the following linear equations L* = L* W + c* (L* C L* W ) (0 = c* = 1) and similarly for the CIELAB chroma data a* and b*. For the mean device value c*=0.5 the

36、CIELAB data are calculated as mean of the CIELAB data of Cyan-blue C and White W. Multi-spectral CIELAB imaging and new device *-coordinates (star-coordinates) If the analog ISO/IEC-test charts are scanned with the new multi-spectral technology then from the spectral reection or transmission data of

37、 any pixel the CIELAB data can be determined. The devices with these properties are called CIELAB scanners or CIELAB cameras. By the calculation methods of ISO/IEC TR 19797 one can transfer the LAB* data in the digital scan le to the device values such as cmy0*, w*, olv*, 000n* in the digital scan l

38、e. Digital ISO/IEC-test charts with new device *-coordinates (star-coordinates) By the calculation methods of ISO/IEC TR 19797 one can transfer the LAB* data of the analog ISO/IEC-test charts to the device coordinates, e. g. cmy0*, w*, olv*, 000n*. The digital ISO/IEC-test charts are designed using

39、this device data. The CIELAB colour differences between the seven basic colours CMYOLVN and the paper White W of the analog ISO/IEC-test charts and the standard colours of offset printing are less than the CIELAB colour difference of E* = 3. This is the E* tolerance value specied in ISO/IEC 15775 as

40、 reasonable for ofce equipment image technology. So instead of the production data of the present analog ISO/IEC-test charts the standard colours of offset printing are used as default device data, e. g. cmy0*, w*, olv*, 000n*, in the digital ISO/IEC-test charts. Examples are shown in Annex I. This

41、Technical Report and ISO/IEC 15775 Table 0-1: Application of this Technical Report and ISO/IEC 15775 for specifying image reproduction TR24705/T1TA000.PS Input Output Input media Input and output media and applications Output mediaApplication(TR) or Standard Technical Report Basis TR ISO/IEC 24705 a

42、nalog analog ISO/IEC-test chart (hardcopy) Hardcopy Copier ISO/IEC 15775 analog digital ISO/IEC-test chart (hardcopy) File Scanner TR ISO/IEC 24705 digital analog ISO/IEC-test chart (file) Softcopy Hardcopy Monitor Printer TR ISO/IEC 24705 TR ISO/IEC 24705 ISO/IEC TR 24705:2005(E)ISO/IEC 2005 - All

43、rights reserved vii Table 0-1 includes the applications of this Technical Report and ISO/IEC 15775 to specify image reproduction properties. This Technical Report describes the classication and a basis for the production and application of analog and digital ISO/IEC-test charts. It describes methods

44、 for the specication of image reproduction properties of colour devices. The International Standard ISO/IEC 15775 and this Technical Report dene visual and colorimetric methods to specify the image reproduction properties of colour systems. A colour system includes the black box between input and re

45、production of digital or analog ISO/IEC-test charts. The area of the colour copier devices with the reproduction process “analog analog” is excluded here as this area is already covered by the International Standard ISO/IEC 15775. There is a close relationship to the other reproduction process types

46、 “analog digital” and “digital analog” which require similar specication methods and corresponding digital and analog ISO/IEC-test charts. The different reproduction processes are dened in ISO/IEC 15775 and this Technical Report. This T echnical Report consists of: Section 2. to 6.: Method of specif

47、ying image reproduction of colour systems by digital and analog test charts Classication and principles. Section 7. to 9.: Method of specifying image reproduction of colour systems by digital input and analog output as hardcopy for colour image reproduction devices: “digital analog” (Printers) Appli

48、cation and realisation. Section 10. to 12.: Method of specifying image reproduction of colour systems by analog input and digital output for colour image reproduction devices:“analog digital” (Scanners) Application and realisation Section 13. to 15.: Method of specifying image reproduction of colour

49、 systems by digital input and analog output as softcopy for colour image reproduction devices:“digital analog” (Monitors) Application and realisation. Equal relative CIELAB spacing of analog and digital ISO/IEC-test charts This Technical Report is based on analog and digital ISO/IEC-test charts. The analog ISO/IEC-test charts are equ