Categorical Effects In Printed Color for Elderly and Young People Under Different Color Temperature of Lighting

Supawadee Theerathammakorn and Boonchai Waleetorncheepsawat, Sukohthai Thammathirat Open University, Thailand;
Tomoko Obama, Shizuoka University of Art and Culture, Japan

We investigate the color boundary determined by elderly and young people on comparison of 12 categories of color under the difference in color temperature of lighting. The experimental subjects were comprised of 15 elderlies with the age of 60 -70 years old and 31 young people with the age of 25 – 35 years. Subjects determined the printed color of 1,046 color patches and sorted out them into one of twelve category color boxes (Red, Red-Yellow, Yellow, Yellow-Green, Green, Green-Blue, Blue, Blue-Purple, Purple, Purple-Red, Pink, and Brown). In case of no decision on color patch into the 12 color boxes, the patch was put into “Out” box. The viewing conditions were LED lamp with 2 correlated color temperatures (CCTs) of 6500 and 2800 K, an illuminance of 700 lux, and 0/45 degree observer. CIELAB, CIELCH color space were evaluated and analyzed for color categorical effects between the two groups under different CCTs. MANOVA was applied in terms of statistical analysis. In additions, the 12 categorical colors perceived by the two groups was evaluated by using color difference (delta Eab and delta E2000). The MANOVA results revealed that color boundary is more relate to the color value than the factor of age group or the lighting conditions and also color boundary judgement for the 12 colors of elderly and young are not significantly different, either 6500 K or 2800 K by using statistical analysis. However, we found that the most of 12 categorical colors of elderly under 2800 K presented remarkably color difference compared to elderly under 6500 K, young under 6500 K and 2800 K. The findings suggest that the interaction between color categories and different groups of aging people and also using color design under different lighting condition should be  concerned.

Tomoko Obama belongs to the Faculty of Design at Shizuoka University of Art and Culture (SUAC). She is an associate professor specializing in universal design. One of her research fields is visual information processing, and in 2005 acquired a doctorate in engineering at Ritsumeikan University. She is promoting research activities in fields such as color science, environmental psychology, package design, and elderly research. She has worked on research on living and design for about 25 years at Panasonic Corporation until 2014. She is working on practical workshops and applied research, taking advantage of that experience. Since 2007, she is continuing to collaborate with researchers at Chulalongkorn University and STOU University in Thailand.