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A Memory Effect in Metallic Material Perception
Paru Kondo,Midori Tanaka,Takahiko Horiuchi 한국색채학회 2017 AIC 2017 Jeju Vol.2017 No.10
In color memory matching, it is well known that the perceived color might be different from the original color even if the viewing conditions remain the same. In our previous study, we found that such color shifts also occurred with metallic gold objects. Appropriate luminance modulation was an important factor in the highfidelity perception of the rendered images of gold materials. In this study, we further investigate the memory effect by using actual metallic objects with four different metallic colors (brass, copper, bronze, and iron) having similar 3D shapes. As experimental stimuli, we prepared nine images for each metallic object, including one nonmodified image and eight processed images with modulated luminance and saturation. In our psychophysical experiment, the images were displayed on a calibrated monitor and evaluated with regards to the fidelity of image reproduction through paired comparison in a memory matching procedure. By analyzing the results of principal component scores, it was found that the saturation shift and luminance enhancement corresponded to the 1st and 2nd principal component vectors.
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