Open AccessDefinition of a measurement scale of graininess from reflectance and visual measurements
Author(s) -
Alejandro Ferrero,
Jesús Velázquez,
Esther Perales,
J. Campos,
Francisco M. Martínez Verdú
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.030116
Subject(s) - reflectivity , optics , texture (cosmology) , materials science , scale (ratio) , computer science , artificial intelligence , physics , quantum mechanics , image (mathematics)
Effect pigments in coatings produce eye-catching colour and texture effects and are widely used in automotive, cosmetics, coatings, inks, flooring, textile or decoration. One of these texture effects is graininess, which is the perceived texture exhibited when the effect coating is observed under diffuse illumination. To date there is not a standard procedure to measure graininess from reflectance measurements. The objective of this work is to propose a methodology for traceable graininess measurements, similarly as it was proposed for colour in 1931. In this article, the relevant reflectance-based quantities are clearly defined, and a formal relation with data from visual experiments is given. This methodology would allow a measurement scale of graininess and a difference formula to be agreed once conclusive visual data become available.