1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationGraphic technology Process control for the production of half-tone colour separations, proof and production printsPart 8: Validation print processes working directly from digital
2、 dataBS ISO 12647-8:2012National forewordThis British Standard is the UK implementation of ISO 12647-8:2012.The UK participation in its preparation was entrusted to Technical CommitteePAI/43, Graphic technology.A list of organizations represented on this committee can be obtained onrequest to its se
3、cretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 69371 7ICS 37.100.01Compliance with a British Standard cannot
4、 confer immunity fromlegal obligations.This British Standard was published under the authority of the StandardsPolicy and Strategy Committee on 30 April 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS ISO 12647-8:2012Reference numberISO 12647-8:2012(E)ISO 2012IN
5、TERNATIONAL STANDARD ISO12647-8First edition2012-03-15Graphic technology Process control for the production of half-tone colour separations, proof and production prints Part 8: Validation print processes working directly from digital data Technologie graphique Contrle des processus de confection de
6、slections couleurs trames, dpreuves et de tirages Partie 8: Processus dimpression de maquette couleur produite partir de donnes numriques BS ISO 12647-8:2012ISO 12647-8:2012(E) COPYRIGHT PROTECTED DOCUMENT ISO 2012 All rights reserved. Unless otherwise specified, no part of this publication may be r
7、eproduced 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 20 Tel. + 41
8、22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2012 All rights reservedBS ISO 12647-8:2012ISO 12647-8:2012(E) ISO 2012 All rights reserved iiiContents Page Foreword iv Introduction . v 1 Scope 1 2 Normative references 1 3 Terms and definiti
9、ons . 2 4 Requirements . 2 5 Test methods . 8 Annex A (informative) Determination of print durability after stabilization 11 Annex B (normative) Surface gamut patches 14 Bibliography 16 BS ISO 12647-8:2012ISO 12647-8:2012(E) iv ISO 2012 All rights reservedForeword ISO (the International Organization
10、 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
11、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. Intern
12、ational 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. Publicati
13、on 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 right
14、s. ISO 12647-8 was prepared by Technical Committee ISO/TC 130, Graphic technology. ISO 12647 consists of the following parts, under the general title Graphic technology Process control for the production of half-tone colour separations, proof and production prints: Part 1: Parameters and measurement
15、 methods Part 2: Offset lithographic processes Part 3: Coldset offset lithography on newsprint Part 4: Publication gravure printing Part 5: Screen printing Part 6: Flexographic printing Part 7: Proofing processes working directly from digital data Part 8: Validation print processes working directly
16、from digital data BS ISO 12647-8:2012ISO 12647-8:2012(E) ISO 2012 All rights reserved vIntroduction This part of ISO 12647 specifies the properties, and associated test methods, required for digital prints and printing processes to meet the criteria established for “validation prints”. In most print
17、ing workflows, there is a requirement for a visual representation of the expected appearance of the document being printed that can be used as part of the agreement between the customer and printer. Where this visual representation is produced such that its characteristics (colour fidelity, tone rep
18、roduction, registration, size, etc.) simulate those of the expected printing within tight tolerances, it is usually referred to as a “contract proof”. As the name implies, contract proofs are used as part of the contractual relationship between customer and printer and are used as a visual aim for t
19、he press operator during printing as well as the absolute reference against which the finished production is compared. Not unexpectedly, systems that can produce contract proofs are usually expensive and require careful operation and maintenance. ISO 12647-7 specifies the requirements for contract p
20、roofs and systems used to produce contract proofs directly from digital data. Recently, other visualizations of the final printed product have found a place in the printing/proofing workflow because designers and print buyers prefer not go to the expense of using an ISO 12647-7 compliant contract pr
21、oof any earlier in the process than necessary. In many situations, participants in the work flow require a hardcopy visual reference of lesser quality than a contract proof. In the past, those prints varied widely in quality and were often referred to as design proofs, concept proofs, layout prints,
22、 etc. That quality level is here being referred to as a “validation print”. Because data are exchanged electronically and visualizations of those data are produced at multiple sites, there is a requirement for defined requirements for validation prints to allow a degree of consistency throughout the
23、 workflow. One of the goals of having less stringent requirements, particularly on colour fidelity, is to allow the production of validation prints on less elaborate and less costly devices than are required for contract proofs. The requirements for validation prints and the systems used to produce
24、validation prints are documented in this part of ISO 12647. Validation prints are not intended to replace “contract proofs” for predicting colour on production printing devices. It is expected that the modifications of the requirements for validation prints, along with the requirements for contract
25、proofs, will continue in the future as industry requirements and imaging technologies develop. BS ISO 12647-8:2012INTERNATIONAL STANDARD ISO 12647-8:2012(E) ISO 2012 All rights reserved 1Graphic technology Process control for the production of half-tone colour separations, proof and production print
26、s Part 8: Validation print processes working directly from digital data IMPORTANT The electronic file of this document contains colours which are considered to be useful for the correct understanding of the document. Users should therefore consider printing this document using a colour printer. 1 Sc
27、ope This part of ISO 12647 specifies requirements that can be used for determining the conformance of systems that produce a hard-copy validation print, directly from digital data, which is intended to simulate the expected appearance of material printed in accordance with a characterized printing c
28、ondition. It is not intended for use in determining the conformance of production printing systems (digital or conventional) since many aspects of production printing are not covered in this part of ISO 12647. 2 Normative references The following referenced documents are indispensable for the applic
29、ation of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the reference document (including any amendments) applies. ISO 3664:2009, Graphic technology and photography Viewing conditions ISO 8254-1, Paper and board Measurement of specu
30、lar gloss Par 1: 75 degree gloss with a converging beam, TAPPI method ISO 12639, Graphic technology Prepress digital data exchange Tag image file format for image technology (TIFF/IT) ISO 12040, Graphic technology Prints and printing inks Assessment of light fastness using filtered xenon arc light I
31、SO 12640-1:1997, Graphic technology Prepress digital data exchange Part 1: CMYK standard colour image data (CMYK/SCID) ISO 12642-2, Graphic technology Input data for characterization of 4-colour process printing Part 2: Expanded data set ISO 12647-1, Graphic technology Process control for the produc
32、tion of half-tone colour separations, proof and production prints Part 1: Parameters and measurement methods ISO 13655:2009, Graphic technology Spectral measurement and colorimetric computation of graphic arts images BS ISO 12647-8:2012ISO 12647-8:2012(E) 2 ISO 2012 All rights reserved3 Terms and de
33、finitions For the purposes of this document, the terms and definitions given in ISO 12647-1 and the following apply. 3.1 validation print substrate printing substrate used for validation print processes NOTE A validation print substrate is usually characterized by its light fastness or permanence pr
34、operties, with only essential requirements dictated by the printing process. 3.2 ICC International Color Consortium 3.3 print stabilization period time after which the colour does not change anymore NOTE It is necessary that this property of the validation print system be specified by the manufactur
35、er. 3.4 digital contract proof digital print of high colour accuracy, useable as reliable visual colour reference for printing, and as a part of a commercial agreement as defined in ISO 12647-7 3.5 validation print print produced directly from digital data early in the production chain meeting the r
36、equirements of this part of ISO 12647 representative of the concept for the final product NOTE A validation print can have reduced accuracy compared to contract proof. 3.6 production print substrate intended substrate to be used for production printing 3.7 PDF/X title of a series of ISO standards re
37、garding the use of the Portable Document Format (PDF) for the dissemination of digital data intended for print reproduction 3.8 TIFF/IT Tagged Image File Format for Image Technology format for exchanging raster-based data in accordance with ISO 12639 4 Requirements 4.1 Data requirements for validati
38、on print systems Validation print systems shall accept digital data delivered as PDF/X data files in accordance with ISO 15930 (all parts) or TIFF/IT files in accordance with ISO 12639. Where the digital data is delivered as PDF/X data files, the intended printing condition being simulated shall be
39、that defined in the OutputIntents array of the PDF/X file. Where a profile is required for data conversion, the profile that is the value of the DestOutputProfile key in the PDF/X file shall be used. Where TIFF/IT files are used, colour information shall be included using tag 34675 or tag 34029. BS
40、ISO 12647-8:2012ISO 12647-8:2012(E) ISO 2012 All rights reserved 34.2 Validation print 4.2.1 Validation print substrate colour and gloss The choice of the substrate used for the creation of a validation print is based on a combination of the users knowledge of the intended production printing substr
41、ate and the capabilities of the equipment used to create the validation print. In cases where the production print substrate is not used for the validation print or is unknown, then the substrate used for the validation print shall be white on both the front and the back and shall not have any print
42、 on the back that influences the resulting measurements. In applications where the substrate that will be used for the production print is known and the equipment used to create the validation print is compatible with that substrate, the unmarked production print substrate shall be used to create th
43、e validation print. In applications where the substrate used for the production print is known, but is not compatible with the equipment being used to create the validation print, a substrate shall be selected whose colour, measured in accordance with ISO 13655:2009 M0 with white backing, simulates
44、the unprinted substrate within a CIELAB 1976 colour difference of 3.0 computed in accordance with ISO 13655. This simulation should be determined using ISO 13655:2009 M1 with white backing, when available. This simulation of substrate colour may be accomplished using uniform coloration of the unprin
45、ted area during creation of the validation print. In addition, the gloss of the validation print substrate should be that of the production print substrate within 15 gloss units as measured according to 5.6. The validation print and production print substrates should ideally have similar levels of O
46、BA (optical brightening agents) present and exhibit the same amount of fluorescence under an M1 illumination source. NOTE 1 This does not imply that under other measurement conditions the simulation will be the same. The paper industry provides methods that do not conform to ISO 13655 M0 or M1 for e
47、stimating the similarity of OBA levels but not image colour between production print and validation print. This part of ISO 12647 addresses situations that can occur very early in the creative process where the intended printing production substrate is not known. In such situations, a substrate shal
48、l be selected whose colour simulates the production substrate colour, as obtained from the characterization data set being used to create the validation print. The tolerance on the simulation shall be a CIELAB colour difference of 3 units. The measurement conditions targeted shall be those specified
49、 for the characterization data set being used. This simulation of substrate colour may be accomplished using uniform coloration of the unprinted area during creation of the validation print. In such a case, the unprinted areas of the substrate shall be removed in order to assure adaptation to the correct white point. The gloss of the substrate shall be selected to simulate the general type of printing expected based on the reference values of Table 1. NOTE 2 In cases
