SIST ISO 12647-7:2017

INTERNATIONAL ISO
STANDARD 12647-7
Third edition
2016-11-15
Graphic technology — Process control
for the production of halftone colour
separations, proof and production
prints —
Part 7:
Proofing processes working directly
from digital data
Technologie graphique — Contrôle des processus de confection de
sélections couleurs tramées, d’épreuves et de tirages —
Partie 7: Processus d’épreuve travaillant directement à partir de
données numériques
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 3
4.1 Colour difference measurements . 3
4.2 Data files, simulation of screens. 3
4.2.1 Data delivery . 3
4.2.2 Screen frequency . 3
4.2.3 Screen angle . 3
4.2.4 Dot shape . 3
4.2.5 Halftone proofs screening . 3
4.3 Proof print . 3
4.3.1 General. 3
4.3.2 Proofing substrate colour and gloss . 4
4.3.3 Colouration of printed parts . 4
4.3.4 Gamut . 5
4.3.5 Permanence of proofing substrate and printed parts . 5
4.3.6 Repeatability of proof printing . 6
4.3.7 Colourant rub resistance . 6
4.3.8 Ink set gloss . 7
4.3.9 Tone value reproduction limits . 7
4.3.10 Reproduction of vignettes . 7
4.3.11 Image register and resolving power . 7
4.3.12 Margin information . 7
5 Test methods . 8
5.1 Viewing conditions . 8
5.2 Control strip . 8
5.3 Additional test objects . 9
5.3.1 Resolution . 9
5.3.2 Primary and secondary process colours . 9
5.3.3 Resolving power . 9
5.3.4 Uniformity . 9
5.4 Colour measurement . 9
5.5 Measurement of gloss .10
5.6 Visual appraisal of proof-press-print matches .10
Annex A (normative) Technical requirements for proofing conformity .11
Annex B (normative) Rub resistance of the proof colourant .15
Annex C (normative) Outer gamut patches.18
Annex D (informative) Organizational certification routines for visual appraisal of proof-
print press-print matches .21
Bibliography .23
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 World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 130, Graphic technology.
This third edition cancels and replaces the second edition (ISO 12647-7:2013), which has been
technically revised with the following changes:
— a number of anomalies identified by industry experts have been addressed;
— substrate selection and measurement specification has been modified to reflect industry practice;
— approximately equivalent CIEDE2000 colour difference values have been added;
— basic support for spot inks has been added;
— wording has been updated to reflect current terminology and industry thinking.
A list of all parts in the ISO 12647 series can be found on the ISO website.
iv © ISO 2016 – All rights reserved

Introduction
ISO 12647-1 serves to provide definitions, the general principles, the general order, the material to be
covered in ISO 12647-2 to ISO 12647-8, the definition of the data, the measurement conditions, and the
reporting style.
This document relates to the subject of digital proofing and establishes proofing requirements for the
most demanding part of the printing and publishing market.
This document specifies aim values (or sets of aim values) and tolerances for the primary parameters
specified in ISO 12647-1 for digital proof printing. Primary parameters that define a printing condition
include screening parameters (where applicable), the colours of the solids, the colour of the print
substrate, colours of intermediate tint values and the tone curve. This document also specifies test
methods for those properties of digital proof prints and their substrates that are considered relevant
for stable and reliable proofing conditions, and thus for a certification procedure.
The graphic technology industry makes extensive use of proofing to predict the rendering of digital data
files by a wide variety of high-definition, high-quality off-press printing processes and applications.
Each prediction is based on a characterization data set that defines a particular printing condition.
Typically, the specified printing condition is defined through an International Color Consortium (ICC)
profile or the associated characterization data set, both of which relate source data and colorimetric
values of the printed colour. Such data may be derived from printing conditions conforming to the
pertinent process standard of the ISO 12647 series by industry trade groups or individuals.
The purpose of a proof print is to simulate the visual characteristics of the finished production print
product as closely as possible. In order to visually match a particular printing condition, proofing
processes require a set of parameters to be specified that are not necessarily identical to those put
forward in ISO 12647-1 or another part of ISO 12647. This is caused by differences in colourant spectra
or phenomena such as gloss, light scatter (within the print substrate or the colourant), and transparency.
In such cases, it is also found that spectrocolorimetry takes precedence over densitometry.
Another problem area is the matching of a double-sided production print on a lightweight printing
substrate, such as often used in heat-set web and publication gravure printing, to a digital proof on
a nearly opaque substrate. If the proof was produced using a colour management profile based on
measurements with white backing, there will be an unavoidable visual and measurable difference
between the proof on the one hand and the production print placed on black on the other hand. A
black backing is required for double-sided production printing
...