TY - GEN
T1 - Evaluation of WCAG 2.0 success criteria on luminance contrast ratio based on age-related spectral efficacy
AU - Fujita, Tetstuya
AU - Nakashima, Yoshio
AU - Takamatsu, Mamoru
PY - 2011
Y1 - 2011
N2 - To evaluate WCAG2.0 success criteria on luminance contrast ratio, we executed the precise measurement of spectral radiance for web-safe colors, and calculated the age-related relative luminance and contrast based on the age-related spectral luminous efficacy, which is defined in Japanese Industrial Standard. As a result, reduction of luminance by aging is observed, especially among people in their 70s, at the bluish region. Also, by calculating the age-related luminance contrast ratio against black background, we have found out that 4 out of 98 in level AAA, and 1 out of 42 in level AA web-safe colors, which satisfy WCAG 2.0 success criteria, become ineligible by aging. Therefore, considering the effect of aging, while WCAG2.0 success criteria are mostly suitable for web-safe colors, we must be careful to use the colors on the boundary of the WCAG2.0 eligible area. And it is also recommended that we use 204 or more HSV value color against black background, because, if HSV value is less than 153, level AAA web-safe colors are not eligible for any age.
AB - To evaluate WCAG2.0 success criteria on luminance contrast ratio, we executed the precise measurement of spectral radiance for web-safe colors, and calculated the age-related relative luminance and contrast based on the age-related spectral luminous efficacy, which is defined in Japanese Industrial Standard. As a result, reduction of luminance by aging is observed, especially among people in their 70s, at the bluish region. Also, by calculating the age-related luminance contrast ratio against black background, we have found out that 4 out of 98 in level AAA, and 1 out of 42 in level AA web-safe colors, which satisfy WCAG 2.0 success criteria, become ineligible by aging. Therefore, considering the effect of aging, while WCAG2.0 success criteria are mostly suitable for web-safe colors, we must be careful to use the colors on the boundary of the WCAG2.0 eligible area. And it is also recommended that we use 204 or more HSV value color against black background, because, if HSV value is less than 153, level AAA web-safe colors are not eligible for any age.
KW - Age-related spectral luminous efficacy
KW - Color universal design
KW - Luminance contrast ratio
KW - WCAG 2.0
KW - Web-safe colors
UR - http://www.scopus.com/inward/record.url?scp=84865077471&partnerID=8YFLogxK
M3 - 会議への寄与
AN - SCOPUS:84865077471
SN - 9789728939526
T3 - Proceedings of the IADIS International Conference Interfaces and Human Computer Interaction 2011, Part of the IADIS Multi Conference on Computer Science and Information Systems 2011, MCCSIS 2011
SP - 489
EP - 491
BT - Proceedings of the IADIS International Conference Interfaces and Human Computer Interaction 2011, Part of the IADIS Multi Conference on Computer Science and Information Systems 2011, MCCSIS 2011
T2 - IADIS International Conference Interfaces and Human Computer Interaction 2011, Part of the IADIS Multi Conference on Computer Science and Information Systems 2011, MCCSIS 2011
Y2 - 24 July 2011 through 26 July 2011
ER -