The potential of color measurements with the CIEDE2000 equation in wood science

Abstract

This study seeks to assess the potential use of the CIEDE2000 color difference equation in wood science. Therefore, a set of oak wood samples were prepared and assessed by experts. The visual perception of the observers was correlated with the two different color difference equations CIELAB from DIN 6174 and the CIEDE2000 equation. For a practical example two different types of wood were bleached and exposed to UV-light. The results showed that the CIEDE2000 equation outperformed the CIELAB equation. The CIELAB equation showed generally an overestimation of the color change ( E) for wood applications, compared to the nontrivial CIEDE2000 equation from 2001. DieVerwendung der CIEDE2000 Formel für Farbmessungen in der Holzforschung Zusammenfassung Diese Studie versucht die mögliche Verwendung der Farbunterschiedsformel CIEDE2000 in der Holzforschung zu beurteilen. Daher wurde eine Reihe von Eichenholzproben hergestellt und visuell begutachtet. Die visuelle Wahrnehmung wurde mit den Farbwertergebnissen der beiden Farbunterschiedsgleichungen CIELAB aus M. Hauptmann ( ) · H. Pleschberger · C. Hansmann Wood K plus-DIN 6174 und der CIEDE2000 Gleichung korreliert. Für ein praktisches Beispiel wurden zwei verschiedene Arten von Holz gebleicht und mit UV-Licht bestrahlt. Die erhaltenen Ergebnisse zeigen, dass die Gleichung CIEDE2000 die CIELAB Gleichung in ihrer Vorhersage des tatsächlichen Farbunterschieds übertrifft. Die CIELAB-Gleichung zeigte im Allgemeinen eine Überschätzung des Farbunterschieds ( E) auf Holz, im Vergleich zur CIEDE2000 Gleichung aus dem Jahr 2001.

Colorimetric evaluation of 3D printing polymers exposed to accelerated aging for Cultural Heritage applications

“…However, several authors have employed the CIEDE2000 color-difference formula under many different viewing conditions apart from the "reference" mentioned before. [60][61][62] In order to determine the variability of the measurements carried out in the samples surface, the MCDM value was calculated resulting in a CIELAB unity amount using the following equation 63 :…”

A colour assessment methodology for oak wood

“…As the appearance of wood is also strongly determined by its texture, most likely, not all parametric factors are equal to 1. Hauptmann et al (2011) had better results with ΔE 00 (2:1:1) than with ΔE 00 (1:1:1) in their study with oak wood. The common determination of the parametric factors, by comparing visual colour differences with the corresponding ΔE 00 (Xin et al 2001), is unfeasible for wood as a visual colour difference scale is difficult to compose.…”

Drying of oak wood lamellas: Part 2. Influence of temperature on the drying quality and wood colour

“…Quantification of wood colour change (e.g., after drying (A g u i l a r-To va r et al 2009) or some treatment) is usually done using parameter ΔE (CIE 1976-ISO 11664: 2008, but some papers indicate that this parameter needs correction when it comes to wood (e.g., D efo i rd t et al. 2011;Hauptmann et al 2012). Having in mind the above mentioned, as well as the results presented in the first part (Mi l i ć et al 2021), the aim of this part of the paper is to analyse the influence of higher initial temperatures (higher than those common in practice) during the drying of oak lamellas on the drying quality and wood colour.…”

“…након сушења (A g u i l a r-Tova r et al 2009) или неког третмана) најчешће се врши преко параметра ΔE (CIE 1976-ISO 11664:2008, али постоје радови који указују на то да овај параметар када је у питању дрво треба кориговати (нпр. D efo i rd t et al 2011;Hauptmann et al 2012).…”