Pontawee PUNGRASSAMEE^1*, Mitsuo IKEDA^1,2*, Pichayada KATEMAKE¹ and Aran HANSUEBSAI¹

¹Department of Imaging and Printing Technology, Chulalongkorn University, Bangkok 10330, Thailand
²Department of Phtonics, Ritsumeikan University, Nojihigashi, Kusatsu, Shiga 525-8577, Japan

(Received October 14, 2004; Accepted February 21, 2005)

The color appearance was measured for a test patch which was placed in a test room illuminated by daylight lamps and was looked at from a subject room illuminated by one of four colored illuminations, red, yellow, green and blue, through windows of various sizes. When the window was small so that only the test patch was seen within the window the color of the test patch appeared almost opponent to the illumination color, but as soon as something was seen within the window of a larger size the color returned to the original color of the test patch. To recognize the test room as a space was essential to perceive the real color of the test patch. The results were explained by the concept of the recognized visual space of illumination.

Key words: color appearance, color mode, color constancy, chromatic adaptation, apparent lightness, space recognition, recognized visual space of illumination, 3D space

^*Reprint may be asked either from pontawee@sc.chula.ac.th or kay_mitsuo@ybb.ne.jp