ISO 18314-4:2024

International Standard   Current Edition
· Approved on 15 January 2024 ·

Analytical colorimetry — Part 4: Metamerism index for pairs of samples for change of illuminant

ISO 18314-4:2024 Files

null Pages
Current Edition

ISO 18314-4:2024 Scope

This document specifies a formalism for the calculation of the illuminant metamerism of solid surface colours. It cannot be applied to colours of effect coatings without metrical adaptation.

This document only covers the phenomenon of metamerism for change of illuminant, which has the greatest meaning in practical application. In the case where chromaticity coordinates of a pair of samples under reference conditions do not exactly match, this document gives guidance on which correction measures to take. Regarding the reproduction of colours, the metamerism index is used as a measure of quality in order to specify tolerances for colour differences between a colour sample and a colour match under different illumination conditions.

The quantification of the illuminant metamerism of pairs of samples is formally performed by a colour difference assessment, for which tolerances that are common for the evaluation of residual colour differences can be used.

NOTE       In the colorimetric literature and textbooks, the term geometric metamerism is sometimes used for the case where two colours appear to be the same under a specific geometry for visual assessment and selected standard observer and standard illuminant pair, but are perceived as two different colours at changed observation geometry. The term geometric metamerism is different to metamerism described in this document.

Best Sellers

GSO 150-2:2013
 
Gulf Standard
Expiration dates for food products - Part 2 : Voluntary expiration dates
BH GSO 150-2:2015
GSO 150-2:2013 
Bahraini Standard
Expiration dates for food products - Part 2 : Voluntary expiration dates
BH GSO 150-1:2015
GSO 150-1:2013 
Bahraini Technical Regulation
Expiration dates for food products -Part 1 : Mandatory expiration dates
GSO 150-1:2013
 
Gulf Technical Regulation
Expiration dates for food products -Part 1 : Mandatory expiration dates

Recently Published

ISO/IEC 14763-3:2024
 
International Standard
Information technology — Implementation and operation of customer premises cabling — Part 3: Testing of optical fibre cabling
ISO 12625-5:2024
 
International Standard
Tissue paper and tissue products — Part 5: Determination of wet tensile strength
ISO 11772:2024
 
International Standard
Hot-rolled longitudinally profiled steel plate
ISO 24146-1:2024
 
International Standard
Ships and marine technology — Shipboard waste on inland navigation vessels — Part 1: On board management and handling