Graphic technology -- Printing from digital data across multiple technologies

ISO/PAS 15339-2 specifies a limited number of characterized reference printing conditions that span the expected range of colour gamuts used for the production of printed materials from digital data, regardless of the printing process used. Their use is described in ISO/PAS 15339‑1.

Technologie graphique -- Impression à partir de données numériques via des technologies multiples

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Status
Published
Publication Date
24-Aug-2015
Current Stage
9092 - International Standard to be revised
Start Date
28-Jul-2021
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ISO/PAS 15339-2:2015 - Graphic technology -- Printing from digital data across multiple technologies
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PUBLICLY ISO/PAS
AVAILABLE 15339-2
SPECIFICATION
First edition
2015-08-15
Graphic technology — Printing
from digital data across multiple
technologies —
Part 2:
Characterized reference printing
conditions, CRPC1–CRPC7
Technologie graphique — Impression à partir de données numériques
via des technologies multiples —
Partie 2: Conditions d’impression de référence caractérisées, CRPC1–
CRPC7
Reference number
ISO/PAS 15339-2:2015(E)
ISO 2015
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ISO/PAS 15339-2:2015(E)
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.
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copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
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ISO/PAS 15339-2:2015(E)
Contents Page

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

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

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

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

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

4 Requirements .......................................................................................................................................................................................................... 1

5 Data files........................................................................................................................................................................................................................ 5

Annex A (normative) Tone value increase ...................................................................................................................................................... 6

Bibliography ................................................................................................................................................................................................................................ 9

© ISO 2015 – All rights reserved iii
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ISO/PAS 15339-2:2015(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/PAS 15339 consists of the following parts, under the general title Graphic technology — Printing

from digital data across multiple technologies:
— Part 1: Principles [Publicly Available Specification]

— Part 2: Characterized reference printing conditions, CRPC1–CRPC7 [Publicly Available Specification]

iv © ISO 2015 – All rights reserved
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ISO/PAS 15339-2:2015(E)
Introduction

ISO/PAS 15339 is based on the premise that in the printing and publishing industries, electronic

data are the intermediary for content storage and exchange throughout production including copy

preparation, job assembly, proofing, and process printing. It further assumes that data preparation can

be largely process-independent and that the choice of the printing process or processes to be used for

final production will be based primarily on run-length requirements and the substrates to be used.

There are various tools in place to both define the relationship of digital data to printed colour for

specific instances of printing and to manipulate data such that similar results can be obtained between

and among different printing processes (see ISO/TS 10128). These specific instances of printing are

typically described by colour characterization data, which is the relationship between CMYK input data

and colour measured on the printed sheet. Where such a set of colour characterization data are used as

a reference it is referred to as a characterized reference printing condition (CRPC).

ISO/PAS 15339-1 describes the principles involved in developing and working with CRPCs.

This part of ISO/PAS 15339 defines a set of CRPCs associated with the initial publication of

ISO/PAS 15339. It is intended that if changes in, or additions to, these data sets are needed in the future,

they will be documented in additional parts of ISO/PAS 15339 so that changes in the data sets are

possible without losing traceability to earlier data sets.

Not all printing processes that can achieve the same colour gamut are subject to the same limitations.

Offset, gravure, flexography, electrophotographic, ink-jet, etc. each have limitations that may have to

be considered in the final data preparation. These typically include limitations of total ink coverage,

and minimum and maximum printable dot sizes. Should general guidance be needed, additional parts

of ISO/PAS 15339 can be prepared to assist in the communication or standardization of the handling of

such limitations.
© ISO 2015 – All rights reserved v
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PUBLICLY AVAILABLE SPECIFICATION ISO/PAS 15339-2:2015(E)
Graphic technology — Printing from digital data across
multiple technologies —
Part 2:
Characterized reference printing conditions, CRPC1–CRPC7
1 Scope

This part of ISO/PAS 15339 specifies a limited number of characterized reference printing conditions

that span the expected range of colour gamuts used for the production of printed materials from digital

data, regardless of the printing process used. Their use is described in ISO/PAS 15339-1.

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 12642-2, Graphic technology — Input data for characterization of 4-colour process printing — Part 2:

Expanded data set

ISO 13655, Graphic technology — Spectral measurement and colorimetric computation for graphic arts

images

ISO/PAS 15339-1, Graphic technology — Printing from digital data across multiple technologies — Part 1:

Principles

ISO 28178, Graphic technology — Exchange format for colour and process control data using XML or ASCII

text

CGATS TR015:2013, Graphic technology — Methodology for Establishing Printing Aims Based on a Shared

Near-neutral Gray-scale
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO/PAS 15339-1 apply.

4 Requirements

As defined in ISO/PAS 15339-1, unless otherwise agreed between sender and receiver, the characterized

reference printing condition (CRPC) used for data preparation and data exchange shall be one of the

data sets defined in this or subsequent parts of ISO/PAS 15339.

The characterization data associated with the characterized reference printing conditions identified in

this part of ISO/PAS 15339 are presented as data files “ISO15339-CRPC1.txt” to “ISO15339-CRPC7.txt”

(see Clause 5).
© ISO 2015 – All rights reserved 1
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ISO/PAS 15339-2:2015(E)

Although a normative part of this International Standard, they may be freely used and distributed

provided that the header of all distributed files indicates that they are part of ISO/PAS 15339.

NOTE 1 When additional CRPCs are published in subsequent parts of ISO/PAS 15339, it is expected they will

follow the same sequential naming scheme to avoid confusion, i.e. ISO15339-CRPC8 would be the next named

data set.

The characterized reference printing conditions included in these data files have been selected to be

near the middle of both the general class of printing that is expected to make use of each characterized

reference printing condition and the colour of the substrates used. It is also expected that adjustments

for substrate colour (see ISO/PAS 15339-1) will allow each characterized reference printing condition

to meet a wide variety of needs and be independent of the actual printing process to be used.

The tone reproduction curves used are based on the procedures defined in CGATS TR015 and are

dependent on the reflectance of the substrate and of the black and 3-colour solids. The equations of

CGATS TR015 provide the CIE Y tristimulus value corresponding to a particular cyan tone value of a

near neutral scale.

To provide a consistent relationship between the substrate corrected neutral scales of the various data

sets created for this part of ISO/PAS 15339, the CMY triplets defined by Formula 1 were mapped to the

substrate corrected neutral scale of all data sets:
−−42 53
MY==0,,7470CC−×4 100 10 +×2,940 10 C (1)

In addition, the densitometric tone value curves (computed according to A.3) for the three chromatic

colourants were adjusted to have the same tone value increase (see Table A.1).

The data given, for information only, in Tables 1 to 3 are taken from the CRPC data files and are shown

in these tables and figures for information. The CIELAB a*-b* projection of the characterization data of

each of these characterized reference printing conditions is shown in Figure 1.

All colorimetry is defined to be measurement condition M1, according to ISO 13655, with white backing.

NOTE 2 To facilitate the use of the correction of colorimetric data for variations in substrate colour as

described in ISO/PAS 15339-1, the header of each file contains the CIELAB values for both the substrate and a

reference black point of the data set. The values for the substrate are ID 1 in each data set and as described in

ISO/PAS 15339-1 the value in ID 1286 (the 4-colour solid) is used as a reference black point.

The substrate, single colour solids, and two-colour overprints that are the aims for the characterization

data set are as shown in Table 1 and Table 2.

The colorimetrically computed mid-tone TVI for each of the single colour scales of each of the

characte
...

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