ISOTC130/SCN
Date:2005-04-8
ISO/WD12647-7
ISOTC130/SC/WG3
Secretariat:DIN
Graphic technology— Process control— Part7: Off-press proofing processes working directly from digital data
Technologie graphique— Maîtrise de procédé— Partie7: Procédés des épreuves non-méchaniques utilisant directement des donnés numeriques
Warning
This document is not an ISO International Standard. It is distributed for review and comment. It is subject to change without notice and may not be referred to as an International Standard.
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/WD12647-7
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ContentsPage
Foreword
Introduction
1Scope
2Normative references
3Terms and definitions
4Requirements
4.1Data files, simulation of screens
4.1.1Data delivery......
4.1.2Screen frequency......
4.1.3Screen angle......
4.1.4Dot shape and its relationship to tone value......
4.1.5Tone value sum......
4.2Proof print
4.2.1Proofing substrate colour and gloss......
4.2.2Coloration of printed parts......
4.2.3Repeatability......
4.2.4Ink drying properties......
4.2.5Ink set gloss......
4.2.6Tone value reproduction limits......
4.2.7Reproduction of vignettes......
4.2.8Image register and resolving power......
4.2.9Margin information......
4.2.10Gamut......
4.2.11Tone value increase......
5Test methods
5.1Control device
5.2Additional test objects
5.3Colour measurement
5.4Measurement of tone values by colorimeter (tristimulus colorimeter or spectrocolorimeter)
5.5Measurement of gloss
AnnexA (normative) Drying time of a digital proof
A.1Apparatus
A.1.1Slab
A.1.2Rubber mat
A.2Proofing system
A.3Printed test objects
A.4Wipe test
A.4.1Climatic conditions
A.4.2Preparation of the slab
A.4.3Test
A.4.4Evaluation
A.4.5Drying time
A.5Reporting
AnnexB (normative) Certification
B.1Digital proof production in the field
B.1.1General provisions
B.1.2Half-tone and simulated half-tone proofs
B.1.3Other digital proofs
B.2Production system for digital proofing
B.2.1General provisions
B.2.2Half-tone and simulated half-tone proofs
B.2.3Other digital proofs
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.
International Standards are drafted in accordance with the rules given in the ISO/IECDirectives, Part2.
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. Publication 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 rights.
ISO126477 was prepared by Technical Committee ISO/TC130, Graphic technology..
ISO12647 consists of the following parts, under the general title Graphic technology— Process control:
Part 1: Parameters and measurement methods;
Part2: Offset lithographic processes;
Part3: Coldset offset lithography and letterpress on newsprint;
Part4: Publication gravure printing;
Part5: Screen printing;
Part6: Flexographic printing (under preparation);
Part7: Off-press proofing processes working directly from digital data
Introduction
Part 1 of ISO 12647 serves to provide definitions, the general principles, the general order the material to be covered in the subsequent parts 2 to 6of ISO 12647, the definition of the data, the measurement conditions and the reporting style.
This International Standard lists values or sets of values of the primary parameters specified in ISO 12647-1, especially for digital proof printing. Primary parameters include the screening parameters, where applicable, the colours of the solids, the colour of the print substrate, colours intermediate between these and the tone value increase curve,.
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 such prediction is based on a characterization data set that defines a particular printing condition.
Typically the specified printing condition is defined through an ICC profile or the associated characterization data set, both of which relate source data and colorimetrically defined printed colour. Such data may be derived from a printijng conditions confroming 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, off-press proofing processes require a set of parameters to be specified that are not identical to these put forward in ISO 12647-1 or another part of ISO 12647. This is caused by differences in colorant spectra or phenomena such as gloss, light scatter (within the print substrate or the colorant), 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 light weight printing substrate, such as often used in heat-set web and publication gravure printing, to a digital off-press proof on a nearly opaque substrate. If the proof was produced using colour management profiles based on measurements with white backing, there will be an unavoidable visual and measurable difference between proof on the one hand and the production print placed on black on the other hand. The black backing is required for double-sided non-opaque prints as specified in the pertinent part of ISO 12647. The possible ocurrence of such differences needs to be well communicated, in advance, to all parties concerned.
Historically there has been no consistency in the way that either the characterization data or the criteria and limits for a satisfactory match had been provided. This has led to significant redundancy and inconsistencies in the evaluation of proofing systems for different, but similar applications, and a cost and time burden on the industry. This International Standard therefore attempts to provide guidance in this area by providing specifications and associated testing procedures.
In Annex B, the requirements for a digital proof print listed in the main body of this International Standard are weighted with respect to their relevance in two typical situations:
- To which requirements must a proof print, made for a particular printing condition, conform to if it is to be referenced in a contract between the printer and the provider of the digital data ("Contract proof" or "Certified Proof")?
- To which requirements must a proofing system, comprising hardware and software, conform if it is to be considered capable of reliably producing digital contract proofs for a particular printing condition?
©ISO2005– All rights reserved / 1
ISO/WD12647-7
Graphic technology— Process control— Part7: Off-press proofing processes working directly from digital data
1Scope
This International Standard specifies a number of process parameters and their values to be applied when producing digital proof prints that simulate a chosen printing condition.
This International Standard is directly applicable to half-tone, simulated half-tone and continuous tone proof printing processes that use digital data as the input.
2Normative references
The following referenced documents are indispensable for the application 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 8254-1, Paper and board — Measurement of specular gloss — Part 1: 75 degree gloss with a converging beam, TAPPI method
ISO 12040, Graphic technology — Prints and printing inks — Assessment of light fastness using filtered xenon arc light ISO8254-1, Paper and board — Measurement of specular gloss — Part1: 75° gloss.
ISO 12642-1, Graphic technology — Prepress digital data exchange — Input data for characterization of 4-colour process printing
ISO 15076-1[1]), Image technology colour management — Architecture, profile format, and data structure — Part 1: Based on ICC.1:2004-10
3Terms and definitions
For the purposes of this International Standard the terms and definitions contained in ISO 12647-1 and the following apply:
3.1
digital proof print
off-press proof print produced directly from digital data which serves to simulate the visual impression of the corresponding production print
3.2
proofing substrate
printing substrate used for hard-copy proofing processes
[End of extract……]
©ISO2005– All rights reserved / 1[1])To be published