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A single analytical model for sparkle and graininess patterns in texture of effect coatings

AuthorsFerrero, Alejandro ; Campos Acosta, Joaquín ; Rabal, A. M.; Pons Aglio, Alicia
Issue Date2013
PublisherOptical Society of America
CitationOptics Express 21: 26812-26819 (2013)
AbstractFlakes in effect coatings, which are responsible for its color shift, are not perfectly horizontally oriented, producing a non uniform texture when observed from a distance of around one meter or less. If the coating is illuminated by a diffuse source, a granular appearance is observed, called graininess. But when the coating is illuminated by unidirectional light, some luminous spots on a dark background appear, effect that is known as sparkle. The characterization of these two textures is getting more important for automotive industry because of the high percentage of cars with effect coatings and because improvements in imaging technology allows this effect to be measured by, for instance, commercial instruments as BYK-mac. A single analytical model to understand and radiometrically characterize both sparkle and graininess in effect coatings is presented and studied in this work. It allows both patterns to be explained and, despite its simplicity, includes variables related to the optical system (Point Spread Function (PSF) and size of the entrance pupil), its distance to the coating, the diffusion grade of the illumination, the illumination and observation directions, and coating parameters. © 2013 Optical Society of America
Identifiersdoi: 10.1364/OE.21.026812
issn: 1094-4087
Appears in Collections:(CFMAC-IO) Artículos
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