Graphic technology -- Colour data exchange format (CxF/X)

ISO 17972-2:2016 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 the CxF framework to define a minimum set of data for exchange and identify the data as being part of ISO 12641.

Technologie graphique -- Échange des données de couleur en utilisant CxF

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Status
Published
Publication Date
01-May-2016
Current Stage
9020 - International Standard under periodical review
Start Date
15-Apr-2021
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INTERNATIONAL ISO
STANDARD 17972-2
First edition
2016-05-01
Graphic technology — Colour data
exchange format (CxF/X) —
Part 2:
Scanner target data (CxF/X-2)
Technologie graphique — Échange des données de couleur en
utilisant CxF —
Partie 2: Données cibles du scanner entrantes
Reference number
ISO 17972-2:2016(E)
ISO 2016
---------------------- Page: 1 ----------------------
ISO 17972-2:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All rights reserved. Unless 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 address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 17972-2:2016(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

3.1 Terms ............................................................................................................................................................................................................... 1

3.2 Definitions ................................................................................................................................................................................................... 2

4 Symbols and abbreviated terms ........................................................................................................................................................... 2

5 Requirements .......................................................................................................................................................................................................... 3

5.1 General description of a CxF/X file for data exchange .......................................................................................... 3

5.2 Requirements of a CxF/X-2 file for ISO 12641 data exchange ....................................................................... 3

Annex A (informative) Colour exchange format mapping to ISO 28178 ......................................................................... 5

Annex B (informative) CxF3 schema ..................................................................................................................................................................10

Annex C (informative) Example file ....................................................................................................................................................................11

Bibliography .............................................................................................................................................................................................................................12

© ISO 2016 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 17972-2:2016(E)
Foreword

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 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 Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further 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/directives).

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 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 to conformity

assessment, as well as information about ISO’s 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 following 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 reserved
---------------------- Page: 4 ----------------------
ISO 17972-2:2016(E)
Introduction

ISO 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 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

prepress 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 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 characterization 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 17972, 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 v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 17972-2:2016(E)
Graphic technology — Colour data exchange format
(CxF/X) —
Part 2:
Scanner target data (CxF/X-2)
1 Scope

This 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 the

CxF framework to define a minimum set of data for exchange and identify the data as being part of

ISO 12641.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition 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

calibration

ISO 17972-1, Graphic technology — Colour data exchange format — Part 1: Relationship to CxF3 (CxF/X)

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply
3.1 Terms

NOTE 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 instead of colour.
3.1.1
ColorSpecification

information 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.)
3.1.2
ColorValue

one of a number of defined color space types that can hold values and associated information related to

that specific type of device independent colour space
[SOURCE: Color Exchange Format v3.0]
© ISO 2016 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 17972-2:2016(E)
3.1.3
CustomResources

“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

applications
[SOURCE: Colour Exchange Format v3.0]
3.1.4
DeviceColorValue

one of a number of defined colour space types that can hold values and associated information related

to that specific type of device dependent colour space
[SOURCE: Color Exchange Format v3.0]
3.1.5
object
used to identify each specific “Colour item” that is being described
3.2 Definitions
3.2.1
profile

set of mathematical values or binary structure that allows transformation to/from one device colour

space to another

Note 1 to entry: Profiles are stored in the ProfileCollection and are shared and referenced by the ColourValues.

3.2.2
resources

information about each colour object that is of interest to all readers of the CxF file

Note 1 to entry: Also referred to as the “CxF3 Core”, it is defined by the CxF3-Core namespace schema.

3.2.3
schema

XML document that, conforming to the specifications established by the World Wide Web Consortium,

defines the structure of a class of XML documents
3.2.4
extensible markup language
XML
set of rules for encoding documents electronically
3.2.5
XSD
XML schema definition
4 Symbols and abbreviated terms
The 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, SpotColorName.

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 (element1).
2 © ISO 2016 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 17972-2:2016(E)
5 Requirements
5.1 General description of a CxF/X file for data exchange

The standard Colour Data Exchange Format as presented in ISO 17972-1 captures file information such

as creation and ownership, core colour information (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 include 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

International 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 structure

NOTE The spelling of terms and elements taken 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
...

DRAFT INTERNATIONAL STANDARD
ISO/DIS 17972-2
ISO/TC 130 Secretariat: SAC
Voting begins on: Voting terminates on:
2015-10-12 2016-01-12
Graphic technology — Colour data exchange format
(CxF/X) —
Part 2:
Scanner target data (CxF/X-2)
Technologie graphique — Échange des données de couleur en utilisant CxF —
Partie 2: Données cibles du scanner entrantes
ICS:
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 17972-2:2015(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION. ISO 2015
---------------------- Page: 1 ----------------------
ISO/DIS 17972-2:2015(E)
ISO/DIS 17972-2
Foreword

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 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 Electrotechnical Commission (IEC) on all

matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further 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. www.iso.org/directives

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 Introduction and/or

on the ISO list of patent declarations received. 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 to conformity

assessment, as well as information about ISO's 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.

ISO 17972 consists of the following 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)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

All rights reserved. Unless 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 address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved © ISO TC130 – All rights reserved 3
---------------------- Page: 2 ----------------------
ISO/DIS 17972-2
© ISO 2014

All rights reserved. Unless 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 address below or ISO's 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 copyright@iso.org
Web www.iso.org
Published in Switzerland.
Contents

Foreword ..................................................................................................................................................................... 3

Introduction ............................................................................................................................................................... 4

1 Scope ......................................................................................................................................................................... 5

2 Normative references .......................................................................................................................................... 5

3 Terms and definitions ......................................................................................................................................... 5

4 Symbols and abbreviated terms ....................................................................................................................... 7

5 Requirements ......................................................................................................................................................... 7

Annex A (informative) Color exchange format mapping to ISO 28178 .................................................. 10

Annex B (informative) CxF3 Schema ................................................................................................................ 17

Annex C (informative) Example File ................................................................................................................. 18

Bibliography............................................................................................................................................................. 19

2 © ISO TC130 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/DIS 17972-2
Foreword

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 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 Electrotechnical Commission (IEC) on all

matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further 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. www.iso.org/directives

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 Introduction and/or

on the ISO list of patent declarations received. 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 to conformity

assessment, as well as information about ISO's 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.

ISO 17972 consists of the following 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)
© ISO TC130 – All rights reserved 3
---------------------- Page: 4 ----------------------
ISO/DIS 17972-2
Introduction

ISO 17972 (all parts) 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 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 Color Exchange Format, version 3 (CxF3), for

prepress data exchange and verification.

This part of the 17972 series covers the use of CxF when exchanging data from ISO 12641 Prepress

digital data exchange — Colour targets for input scanner calibration. This document is not designed to

replace ISO 12641 but to define an updated, verifiable, method of data exchange using CxF, acting as a

supplement to Sections 4.6 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 document.

Scanner targets are one of the earliest defined data exchange use cases in the Graphic Arts and continue

to be used for calibration and characterization 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 standard.

The following files are part of ISO 17972-2, and are included as electronic inserts:

• CxF3_Core.xsd,
• CxF3_Schema_Diagram.pdf,
• Scannertarget CxF/X-2.cxf,
• Scannertarget.txt
4 © ISO TC130 – All rights reserved
---------------------- Page: 5 ----------------------
ISO/DIS 17972-2
Graphic technology — Colour data exchange format (CxF/X) —
Part 2: Scanner target data (CxF/X-2)
1 Scope

This 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 document includes the use of a CustomResource element within the CxF

framework to define a minimum of set of data for exchange and identify the data as being part of 12641.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 17972-1, Graphic technology — Colour data exchange format — Part 1: Relationship to CxF3 (CxF/X)

ISO 12641, Graphic technology — Prepress digital data exchange — Colour targets for input scanner

calibration
Color Exchange Format v3.0 documents. Available from the Internet
http://www.colorexchangeformat.com
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply
3.1
term
For the purposes of this document, the following terms and definitions apply.

Note 1 to entry: The spelling of terms taken from Color Exchange Format v3.0 is not altered from that used in the

normative reference. A specific example is the word color instead of colour.
3.1.2
ColorSpecification

information about the ColorValue including its source (measurement specifications),

illuminant/observer calculation method (tristimulus specifications), and physical attributes of the

objects (size, quantity, finish, etc.).
© ISO TC130 – All rights reserved 5
---------------------- Page: 6 ----------------------
ISO/DIS 17972-2
3.1.3
ColorValue

one of a number of defined color space types that can hold values and associated information related to

that specific type of device independent colour space. [SOURCE: Color Exchange Format v3.0]

3.1.4
CustomResources

“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

applications. [SOURCE: Color Exchange Format v3.0]
3.1.5
DeviceColorValue

One of a number of defined colour space types that can hold values and associated information related

to that specific type of device dependent colour space. [SOURCE: Color Exchange Format v3.0]

3.1.6
object
used to identify each specific “Colour item” that is being described
3.2 Definitions
3.2.1
profile

set of mathematical values or binary structure that allows transformation to/from one device colour

space to another

NOTE 1 to Entry: Profiles are stored in the ProfileCollection and are shared and referenced by the

ColorValues.
3.2.2
resources

information about each colour object that is of interest to all readers of the CxF file

NOTE 1 to Entry: Also referred to as the “CxF3 Core” – it is defined by the CxF3-Core namespace schema.

3.2.3
schema

an XML document that, conforming to the specifications established by the World Wide Web

Consortium, defines the structure of a class of XML documents
3.2.4
XML

set of rules for encoding documents electronically
3.2.5
XSD
XML Schema Definition
6 © ISO TC130 – All rights reserved
---------------------- Page: 7 ----------------------
ISO/DIS 17972-2
4 Symbols and abbreviated terms
The 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 SpotColorName.

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 (element1).
5 Requirements
5.1 General description of a C
...

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