1、BS ISO 17972-2:2016Graphic technology Colourdata exchange format (CxF/X)Part 2: Scanner target data (CxF/X-2)BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 17972-2:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 179
2、72-2:2016.The UK participation in its preparation was entrusted to TechnicalCommittee PAI/43, Graphic technology.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Us
3、ers are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 89743 6ICS 35.240.30; 37.100.99Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the au
4、thority of theStandards Policy and Strategy Committee on 31 May 2016.Amendments issued since publicationDate Text affectedBS ISO 17972-2:2016 ISO 2016Graphic technology Colour data exchange format (CxF/X) Part 2: Scanner target data (CxF/X-2)Technologie graphique change des donnes de couleur en util
5、isant CxF Partie 2: Donnes cibles du scanner entrantesINTERNATIONAL STANDARDISO17972-2First edition2016-05-01Reference numberISO 17972-2:2016(E)BS ISO 17972-2:2016ISO 17972-2:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unl
6、ess otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the
7、address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 17972-2:2016ISO 17972-2:2016(E)Foreword ivIntroduction v1 Scope . 12 Normativ
8、e references 13 Terms and definitions . 13.1 Terms . 13.2 Definitions . 24 Symbols and abbreviated terms . 25 Requirements 35.1 General description of a CxF/X file for data exchange 35.2 Requirements of a CxF/X-2 file for ISO 12641 data exchange . 3Annex A (informative) Colour exchange format mappin
9、g to ISO 28178 . 5Annex B (informative) CxF3 schema 10Annex C (informative) Example file 11Bibliography .12 ISO 2016 All rights reserved iiiContents PageBS ISO 17972-2:2016ISO 17972-2:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standa
10、rds 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 organ
11、izations, 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.The procedures used to develop this document and those intended for its f
12、urther maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/direc
13、tives).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. Details of any patent rights identified during the development of the document will be in the
14、Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related
15、to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.The committee responsible for this document is ISO/TC 130, Graphic technology.ISO 17972 consists of the fol
16、lowing parts, under the general title Graphic technology Colour data exchange format (CxF/X): Part 1: Relationship to CxF3 (CxF/X) Part 2: Scanner target data (CxF/X-2) Part 3: Output target data (CxF/X-3) Part 4: Spot colour characterisation data (CxF/X-4)iv ISO 2016 All rights reservedBS ISO 17972
17、-2:2016ISO 17972-2:2016(E)IntroductionISO 17972 defines methods for the use of CxF3 to exchange measurement data and associated metadata within the graphic arts industry and for the exchange of these files between graphic arts users. It is a multi-part document where each part is intended to respond
18、 to different workflow requirements. The goal throughout the various parts of ISO 17972 has been to maintain the degree of flexibility required while minimizing the uncertainty of the data exchanged.ISO 17972-1 defines the use of the publicly available Colour Exchange Format, version 3 (CxF3), for p
19、repress data exchange and verification.This part of ISO 17972 covers the use of CxF when exchanging data from ISO 12641. This part of ISO 17972 is not designed to replace ISO 12641, but to define an updated, verifiable, method of data exchange using CxF, acting as a supplement to ISO 12641:1997, 4.6
20、 and 4.7. X-Rite Inc., the original creator of the CxF file format, claims no intellectual property rights to the materials used in this part of ISO 17972.Scanner targets are one of the earliest defined data exchange use cases in the graphic arts and continue to be used for calibration and character
21、ization of scanners and other devices. Traditionally, data has been provided in ACSII format using a keyword file. The direct mapping of existing data to the updated CxF/X-2 encoding was one of the primary concerns in writing this part of ISO 17972.The following files are part of this part of ISO 17
22、972, and are included as electronic inserts: CxF3_Core.xsd; CxF3_Schema_Diagram.pdf; Scannertarget CxF/X-2.cxf; Scannertarget.txt. ISO 2016 All rights reserved vBS ISO 17972-2:2016BS ISO 17972-2:2016Graphic technology Colour data exchange format (CxF/X) Part 2: Scanner target data (CxF/X-2)1 ScopeTh
23、is part of ISO 17972 defines an exchange format for target input values, colour and process control data relating to scanner targets (and the associated metadata necessary for its proper interpretation) in electronic form. This part of ISO 17972 includes the use of a CustomResource element within th
24、e CxF framework to define a minimum set of data for exchange and identify the data as being part of ISO 12641.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edit
25、ion cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 12641:1997, Graphic technology Prepress digital data exchange Colour targets for input scanner calibrationISO 17972-1, Graphic technology Colour data exchange format Part 1
26、: Relationship to CxF3 (CxF/X)3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply3.1 TermsNOTE The spelling of terms taken from Colour Exchange Format v3.0 is not altered from that used in the normative reference. A specific example is the word color i
27、nstead of colour.3.1.1ColorSpecificationinformation about the ColorValue (3.1.2) including its source (measurement specifications), illuminant/observer calculation method (tristimulus specifications) and physical attributes of the objects (3.1.5) (size, quantity, finish, etc.)3.1.2ColorValueone of a
28、 number of defined color space types that can hold values and associated information related to that specific type of device independent colour spaceSOURCE: Color Exchange Format v3.0INTERNATIONAL STANDARD ISO 17972-2:2016(E) ISO 2016 All rights reserved 1BS ISO 17972-2:2016ISO 17972-2:2016(E)3.1.3C
29、ustomResources“extensible” part of CxF3, additional information not included in the CxF3 Core about colour objects and the file itself that is considered application specific in nature and not generally of use to all other applicationsSOURCE: Colour Exchange Format v3.03.1.4DeviceColorValueone of a
30、number of defined colour space types that can hold values and associated information related to that specific type of device dependent colour spaceSOURCE: Color Exchange Format v3.03.1.5objectused to identify each specific “Colour item” that is being described3.2 Definitions3.2.1profileset of mathem
31、atical values or binary structure that allows transformation to/from one device colour space to anotherNote 1 to entry: Profiles are stored in the ProfileCollection and are shared and referenced by the ColourValues.3.2.2resourcesinformation about each colour object that is of interest to all readers
32、 of the CxF fileNote 1 to entry: Also referred to as the “CxF3 Core”, it is defined by the CxF3-Core namespace schema.3.2.3schemaXML document that, conforming to the specifications established by the World Wide Web Consortium, defines the structure of a class of XML documents3.2.4extensible markup l
33、anguageXMLset of rules for encoding documents electronically3.2.5XSDXML schema definition4 Symbols and abbreviated termsThe following documentation conventions are used.Names of XML elements are shown in bold type, for example, Resources.Names of XML attributes are shown in italics, for example, Spo
34、tColorName.XML XPaths are used to identify XML elements. For example, container/contained refers to an element (contained) that is a child of another element (container).Similarly, XML XPaths are used to refer to XML attributes, for example, element1/Name refers to an attribute (Name) of an element
35、(element1).2 ISO 2016 All rights reservedBS ISO 17972-2:2016ISO 17972-2:2016(E)5 Requirements5.1 General description of a CxF/X file for data exchangeThe standard Colour Data Exchange Format as presented in ISO 17972-1 captures file information such as creation and ownership, core colour information
36、 (the Resources) and any extended information (CustomResources). In this part of ISO 17972, CustomResources are used to define the minimum required data for ISO 12641 data exchange via CxF/X-2. Any CxF/X file shall meet the following requirements.The FileInformation. element of a CxF/X file shall in
37、clude Creator, CreationDate and Description.The Description element of a CxF/X file shall include “CxF/X” and the number of the applicable International Standard with which the CxF/X file complies.If the file is to be used in support of an International Standard, it shall include the number of the I
38、nternational Standard in the Comment text.A CxF/X file shall validate against the CxF3 Schema (see Annex B). In all cases, a CxF/X document should have the extension “.CxF”.A CxF/X file shall be structured as shown in Figure 1.Figure 1 CxF/X file structureNOTE The spelling of terms and elements take
39、n from Color Exchange Format v3.0 are not altered from that used in the normative reference. A specific example is the word color instead of colour.5.2 Requirements of a CxF/X-2 file for ISO 12641 data exchangeThere are several data requirements stated in ISO 12641:1997, 4.6. Originators of targets
40、are required to provide the following: for all targets batch specific mean and standard deviation colourimetric, data shall be available for each patch in the form of corresponding colorimetric values to two decimal places; calibrated targets shall supply the measured colorimetric data for all targe
41、t patches.Table 1 enumerates the required elements for CxF/X data exchange of scanner target data. Annex A provides a complete mapping of all keywords from ISO 28178 which is a superset of the keywords used in ISO 12641. An example of the use of these in a CxF/X-2 file is provided in Annex C. ISO 20
42、16 All rights reserved 3BS ISO 17972-2:2016ISO 17972-2:2016(E)Table 1 CxF/X-2 required fieldsISO 12641 CxF/X-2Required FieldsOriginator FileInformation.CreatorFile Descriptor FileInformation.DescriptionCreated FileInformation.CreationDateTargetType FileInformation.Tag (“12641_TargetType”);Manufactur
43、er FileInformation.Tag (“Manufacturer”);Prod_Date FileInformation.Tag (“Prod_Date”);Serial FileInformation.Tag (“Serial”);Measurement_Geometry MeasurementSpec.GeometryChoiceMeasurement_Source MeasurementSpec.Device.DeviceIlluminationFilter MeasurementSpec.Device.DeviceFilterPolarization MeasurementS
44、pec.Device.DevicePolarizationWeighting_Function TristimulusSpec.ObserverSample Backing MeasurementSpec.BackingInput values RGB_R (G,B) ColourRGBMeasured values (Either XYZ or Lab)One is requiredXYZ_X (Y,Z) ColourCIEXYZLAB_L (A,B) ColourCIELabRequired of Manufacturers only MEAN_DE Tag (“Mean_DE”)STDD
45、EV_X (Y,Z) Tag (“STDDEV_X”)4 ISO 2016 All rights reservedBS ISO 17972-2:2016ISO 17972-2:2016(E)Annex A (informative) Colour exchange format mapping to ISO 28178A.1 GeneralISO 28178 is the standard text file format for exchanging colour measurement data and provides mapping in both ASCII and XML. The
46、 widely used ASCII text file consists of a Preamble section containing originator information, keyword definitions, etc. followed by one or more data sections, each consisting of header and data subsections. The BEGIN_DATA_FORMAT and END_DATA_FORMAT delimiters define the actual data types contained
47、in the following tables. The BEGIN_DATA and END_DATA delimiters mark the subsection containing the actual colour information in tabular form. ISO 28178 text files can contain device, colorimetric (Lab, XYZ, etc.), densitometric, spectral, naming and other information.Table A.1 demonstrates that all
48、significant data contained in a ISO 28178 file can be captured and maintained in a CxF file. A brief description of the definition of the original ASCII keyword is also provided. This demonstration does not use a CustomResource in this case, but, a CustomResource could be used to make some of the ap
49、plication specific data more structured with defined enumerations and requirements.A.2 Field and Element mappingTable A.1 28178 fields to CxF3 equivalentsISO 28178 CxF 3.0 DescriptionRequired Fields Originator FileInformation/Creator Identifies the specific system, organization or individual that created the data file.File Descriptor FileInformation/Description Describes the purpose or contents of the data file.Created FileInformation/CreationDate Indicates the creation date of the data file. The form for thi
