Hansmann-Roth Sabrina, Mamassian Pascal
Laboratoire des Systèmes Perceptifs (CNRS UMR 8248), Paris, France; Institut d'Etude de la Cognition, Ecole Normale Supérieure - PSL Research University, Paris, France.
Iperception. 2017 Jan 1;8(1):2041669516687770. doi: 10.1177/2041669516687770. eCollection 2017 Jan-Feb.
Interactions between the albedo and the gloss on a surface are commonplace. Darker surfaces are perceived glossier (contrast gloss) than lighter surfaces and darker backgrounds can enhance perceived lightness of surfaces. We used maximum likelihood conjoint measurements to simultaneously quantify the strength of those effects. We quantified the extent to which albedo can influence perceived gloss and physical gloss can influence perceived lightness. We modeled the contribution of lightness and gloss and found that increasing lightness reduced perceived gloss by about 32% whereas gloss had a much weaker influence on perceived lightness of about 12%. Moreover, we also investigated how different backgrounds contribute to the perception of lightness and gloss of a surface placed in front. We found that a glossy background reduces slightly perceived lightness of the center and simultaneously enhances its perceived gloss. Lighter backgrounds reduce perceived gloss and perceived lightness. Conjoint measurements lead us to a better understanding of the contextual effects in gloss and lightness perception. Not only do we confirm the importance of contrast in gloss perception and the reduction of the simultaneous contrast with glossy backgrounds, but we also quantify precisely the strength of those effects.
表面的反照率与光泽度之间的相互作用很常见。较暗的表面比较亮的表面看起来更有光泽（对比光泽），较暗的背景可以增强表面的感知亮度。我们使用最大似然联合测量来同时量化这些效应的强度。我们量化了反照率能在多大程度上影响感知光泽度，以及物理光泽度能在多大程度上影响感知亮度。我们对亮度和光泽度的贡献进行了建模，发现亮度增加会使感知光泽度降低约32%，而光泽度对感知亮度的影响则弱得多，约为12%。此外，我们还研究了不同背景如何影响置于其前的表面的亮度和光泽度感知。我们发现，有光泽的背景会略微降低中心区域的感知亮度，同时增强其感知光泽度。较亮的背景会降低感知光泽度和感知亮度。联合测量使我们能更好地理解光泽度和亮度感知中的上下文效应。我们不仅证实了对比在光泽度感知中的重要性以及与有光泽背景同时对比的减弱，还精确量化了这些效应的强度。
