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Proceedings Paper

Evaluation of the shape of the specular peak for high glossy surfaces
Author(s): Gaël Obein; Shiraz Ouarets; Guillaume Ged
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Paper Abstract

Gloss is the second most relevant visual attribute of a surface beside its colour. While the colour originates from the wavelength repartition of the reflected light, gloss originates from its angular distribution. When an observer is asked to evaluate the gloss of a surface, he always first orientate his eyes along the specular direction before lightly tilting the examined sample. This means that gloss is located in and around the specular direction, in a peak that is called the specular peak. On the one hand, this peak is flat and broad on matte surfaces on the other hand, it is narrow and sharp on high gloss surfaces. For the late ones, the FWHM of the specular peak is less than 2° which can be quite difficult to measure. We developed a dedicated facility capable of measuring specular peak with a FWHM up to 0,1 °. We measured the evolution of the peak according to the angle of illumination and the specular gloss of the sample in the restricted field of very glossy surface. The facility and peaks measured are presented in the paper. The next step will be to identify the correlations between the peak and the roughness of the sample.

Paper Details

Date Published: 24 February 2014
PDF: 11 pages
Proc. SPIE 9018, Measuring, Modeling, and Reproducing Material Appearance, 901805 (24 February 2014); doi: 10.1117/12.2040350
Show Author Affiliations
Gaël Obein, Conservatoire National des Arts et Metiers (France)
Shiraz Ouarets, Conservatoire National des Arts et Metiers (France)
Guillaume Ged, Conservatoire National des Arts et Metiers (France)

Published in SPIE Proceedings Vol. 9018:
Measuring, Modeling, and Reproducing Material Appearance
Maria V. Ortiz Segovia; Philipp Urban; Jan P. Allebach, Editor(s)

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