ISO 18314-3-2022 Analytical colorimetric methods – Part 3: Special indices

ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented on that committee. International governmental and non-governmental organizations liaising with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those used for further maintenance are described in Part 1 of the ISO/IEC Directive. In particular, note the different approval standards required for different types of ISO documents. This document has been drafted in accordance with the editing rules in Part 2 of the ISO/IEC Directive (see

Please note that certain contents of this document may be subject to patent rights. ISO is not responsible for identifying any or all such patents. Details of any patent rights identified during the preparation of the document will be in the introduction and/or list of patent claims received by ISO (see

Any trade names used in this document are information provided for the convenience of the user and do not constitute an endorsement.

Voluntary, related standards and conformity assessment related ISO specific and express the meaning of terminology as well as in relevant ISO technical barriers to trade (TBT) adhere to the principle of the world trade organization (WTO) information, please refer to the

This document has been prepared in collaboration with the Technical Committee of ISO/TC 256 (Pigments, dyes and Fillers) and the Technical Committee CEN/TC 298 (Pigments and Fillers) of the European Committee for Standardization (CEN) in accordance with the Agreement on technical Cooperation between ISO and CEN (Vienna Agreement).

The second edition cancelled and replaced the first edition (ISO 18314-3:415), which had been technically revised.

The main changes are as follows:

— The original paragraph 5.4, relative black value, M years, and the original paragraph 6.4, relative gray value, G years are deleted;

— Original Article 2, symbols and abbreviations, updated and renumbered as Article 4;

— Adding a second article, normative reference;

— Adding a third article, terms and definitions;

– In article 5, the values of x and y are added;

— The text has been edited and revised, and the normative references have been updated.

A list of all the parts in the ISO 18314 family can be found on the ISO website.

Any feedback or questions about this document should be directed to the user’s national standards body. A complete list of these institutions can be found at

ISO 18314-3-2022 Analytical colorimetric methods – Part 3: Special indices

1 range
This document specifies different methods for calculating special indices that are commonly used to describe the brightness and inking of a sample, including chroma or hue within a color coordinate.

This document applies to tri-stimulus values and chrominance coordinates calculated using the color matching function of the CIE 1931 (2°) or CIE 1964 (10°) standard colorimetric system. It is used to specify a color stimulus that is considered to belong to a reflection or transmission object that requires a one-dimensional value.

2 Normative references
The following files are referenced in the text in such a way that some or all of the content constitutes the requirements of this document. For dated references, citation-only versions apply. For undated references, the new version of the reference (including any revisions) applies.

ISO 18451-1, pigments, dyes and fillers — terminology — Part 1: General terminology

3 Terms and Definitions
For the purposes of this document, the terms and definitions given in ISO 18451-1 apply.

Only the standard information section is public. To see the full content, you need to purchase the standard through the official channels.

Share this post