Cite as:
Obein G, Knoblauch K, Chrisment A, Vienot F, 2002, "Perceptual scaling of the gloss of a one-dimensional series of painted black samples" Perception 31 ECVP Abstract Supplement

Perceptual scaling of the gloss of a one-dimensional series of painted black samples

G Obein, K Knoblauch, A Chrisment, F Vienot

Gloss is an attribute of visual appearance that originates from the geometrical distribution of light reflected by surfaces [Hunter, 1987 The Measurement of Appearance 2nd edition (Chichester/New York: John Wiley)]. Practically, specular gloss (ISO 2813) is used to grade the appearance of gloss, but the relation between the visual percept and specular gloss is unknown. Here, we investigate the perceptual spacing of a one-dimensional gloss scale. A series of flat painted black samples was manufactured, corresponding to ten specular gloss values. The experiment was conducted in a light booth in which the observation and illumination geometries were controlled (ASTM D4449-90). Difference scaling was used to evaluate perceptual differences. The task of the observer was to choose, between two pairs of samples, the pair that exhibited the largest visual difference. The visual scale was constructed from the judgments between the pairs by using a maximum-likelihood technique (Maloney and Yang, 1997 Perception 26 Supplement, 128). For all observers, the results showed a similar nonlinear relation between the gloss percept and the gloss index. These results could be interpreted as the conjunction between two percepts, the contrast gloss and the distinctness of image. Profiles obtained at 60°/60° and at 20°/20° incidence/reflection configurations were found to be alike. This result suggests the possibility of a perceptual gloss constancy mechanism.[Supported by BNM.]

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