【日 時】 平成３０年 ２月２２日（木曜日） １３：００～１４：００
【場 所】 有機システムフロンティアセンター１１号館（２階 未来ホール）
【講演者】 1) Assistant Prof. Chanprapha Phuangsuwan （タイ：ラジャマンガラ工科大学 助教授）
【講演演題】 1) Simultaneous color contrast by different devices
1）Simultaneous color contrast by different devices
One of the well-known phenomena of chromatic adaptation is “Simultaneous color contrast”.
Many researchers described the phenomenon as the gray test stimulus influenced by the color of
surrounding field and effected to the perceive the gray test stimulus slightly colored depending
on the color of surrounding. For example, the gray patch when it is surrounded by a green field
appears slightly reddish. In the present work we demonstrate different effect of the simultaneous
color contrast depending on devices; a display, colored object, and colored object covered by a tissue.
A gray patch of the sized 3x3 cm2 was placed on a colored background at its center. the display case a
commercially available unit was used and for the two-room technique an experimental booth was
constructed, which was composed of two rooms, a subject room and a test room connected by a
separating wall on which a small window was opened through which a subject could see a white board
placed in the test room from the subject room. The small window worked as the central gray patch.
The color and the luminance of the surrounding were adjusted about same for both cases. Subject’s
task was to judge the color appearance of the central gray patch by the elementary color naming method,
namely, to judge the amounts of chromaticness, whiteness, and blackness in percentage and amount of
unique hues also in percentage. The result showed high amount of chromaticness of the gray patch
in the two-room technique and display respectively. But on the contrary, in the object case it was
very small even if any. These different effects of the simultaneous color contrast are explained by the
concept of the recognized visual space of illumination RVSI which emphasizes the illumination for the
chromatic adaptation. It was interesting to note a large effect of the simultaneous contrast with a tissue
covering the object.
Simultaneous color contrast in afterimage
ここでは残像の色をelementary color naming法で測定残像の色を見るメカニズムを検討する。
連絡先： 山内研究室 （内線：３３４６）