ISO 12642-3:2021 グラフィックテクノロジー— 4色プロセス印刷の特性評価のための入力データ—パート3：ほぼニュートラルスケールを含む拡張データセット | ページ 2

Foreword

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This document was prepared by Technical Committee ISO/TC 130, Graphic technology.

A list of all parts in the ISO 12642 series can be found on the ISO website.

Introduction

The characterization target ink value combinations defined in ISO 12642-2, have proven very effective for use in characterizing various printing processes. When the ISO 12642-2 and its predecessor the ISO 12642-1 target were introduced, there was a need for a visual layout and manual reading of the target. This led to the need to have some ink value combinations repeated in both single-colour scales and in various overprint combinations. This resulted in 29 duplicate patches in the ISO 12642-2 data sets.

Although a totally revised and/or expanded target has been proposed at various times, the size of the existing ISO 12642-2 target and its patch size have been accepted by the industry and most scanning spectrophotometers contain drivers that accept this format. This led to the decision that the most useful way forward was to simply replace the duplicate patches with new ink value combinations. Because of the increased use of neutral scale calibration, it was felt that these patches would be more useful as additional black only patches and near-neutrals. The ISO 12642-3 target described in this document represents the implementation of these proposals. Some of the removed patches were used in other systems, while duplicate patches were used to verify consistency. The use of multiple targets, averaged measurements and printing of targets along with the ISO 12642-3 are processes that can be used for the capture of the desired data.

There is no required layout or patch size defined for this data set. Users are free to randomize the layout and/or “fit” it to the space available. However, the members of the graphic arts community believe strongly that an example layout should be provided as a guide to the user. Because of the removal of the 29 patches that “filled out” the symmetrical colour layout, no “visual” layout is provided. One randomized example layout is provided.

The needs of publication, commercial, and package printing with offset lithography, gravure, flexography, and other printing processes have been considered.

1 Scope

This document defines a data set of ink value combinations that can be used to characterize four-colour process printing. This data set is not optimized for any printing process or application area but is robust enough for all general applications. While it is primarily aimed at process colour printing with CMYK inks, it can also be used with any combination of three chromatic inks and a dark ink.

This document is an alternative to the ISO 12642-2 data set where more neutral scale data are desired. It is not designed as a replacement for ISO 12642-2.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

Bibliography