| Título: | Colorimetric and spectral evaluation of the optical anisotropy of metallic and pearlescent samples |
| Autores: |
Chorro Calderón, Elísabet Perales Romero, Esther Martínez Verdú, Francisco Miguel Campos Acosta, Joaquín Pons Aglio, Alicia |
| Fecha: |
2010-02-04 2010-02-04 2009 2009-07 |
| Publicador: | RUA Docencia |
| Fuente: |
 |
| Tipo: | info:eu-repo/semantics/article |
| Tema: |
Optical materials Gonio-colour appearance Spectrophotometry Bi-directional spectral reflectance function (BRDF) Object colour measurement Óptica |
| Descripción: |
The visual and optical anisotropies of metallic and pearlescent samples have been evaluated using a multi-gonio-spectrophotometer and by adapting a gonio-template over the instrument aperture for measuring the relative spectral reflectance factor when the sample is rotated around an axis normal to its surface. The results show that spectral data greatly vary as the azimuth angle changes, especially in pearlescent samples. Spectral and colorimetric data of the same sample for the interference and aspecular lines seen in complementary angle pairs have been compared, resulting in hue angle h*ab being kept constant, but lightness L* and chroma C*ab variations are high. In particular, the colour differences ΔEab calculated for pearlescent and metallic samples show that these visual differences can be clearly appreciable, even in metallic samples, but especially in pearlescent ones. Therefore, these types of optical materials do not verify the Helmholtz reciprocity, which is usually applied for digital modelling of material appearance. This research was supported by the Spanish Ministry for Education and Science by means of the grant number DPI2005-08999-C02-02, and the Spanish Ministry Science and Innovation by the Grant number DPI2008-06455-C02-02. |
| Idioma: | Inglés |
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