Agostini & Bruno (1996) found that, under Gelb lighting (an illumination border is made to coincide with the outer border of the display and the rest of the visual field is left in near darkness), the size of the simultaneous lightness contrast effect increases significantly relative to measures taken under homogeneous illumination, and that a similar increase in observed by using CRT simulation. Recently, Agostini & Galmonte (1999) studied the effect of spatial articulation on simultaneous lightness contrast, on the Benary display, and on related displays by using Gelb lighting. Results showed a decrease of the simultaneous lightness contrast effect as the spatial articulation increases. In the present work the same stimuli have been simulated on a CRT monitor. Observers had to perform lightness matches by choosing from a simulated Munsell scale. The pattern of results replicated that obtained under Gelb lighting in paper-and-illuminant displays. This fact is theoretically and methodologically relevant for lightness studies, since it demonstrates that 1. CRT and Gelb lighting presentation methods are equivalent; and 2. both methods allow to measure the effects caused by spatial articulation on lightness, which otherwise could not be detected under homogeneous illumination.
CRT simulation allows the measure of the effect of spatial articulation on lightness
GALMONTE, Alessandra;
1999-01-01
Abstract
Agostini & Bruno (1996) found that, under Gelb lighting (an illumination border is made to coincide with the outer border of the display and the rest of the visual field is left in near darkness), the size of the simultaneous lightness contrast effect increases significantly relative to measures taken under homogeneous illumination, and that a similar increase in observed by using CRT simulation. Recently, Agostini & Galmonte (1999) studied the effect of spatial articulation on simultaneous lightness contrast, on the Benary display, and on related displays by using Gelb lighting. Results showed a decrease of the simultaneous lightness contrast effect as the spatial articulation increases. In the present work the same stimuli have been simulated on a CRT monitor. Observers had to perform lightness matches by choosing from a simulated Munsell scale. The pattern of results replicated that obtained under Gelb lighting in paper-and-illuminant displays. This fact is theoretically and methodologically relevant for lightness studies, since it demonstrates that 1. CRT and Gelb lighting presentation methods are equivalent; and 2. both methods allow to measure the effects caused by spatial articulation on lightness, which otherwise could not be detected under homogeneous illumination.
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