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Title:
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EVALUATION OF WCAG 2.0 SUCCESS CRITERIA ON LUMINANCE CONTRAST RATIO BASED ON AGE-RELATED SPECTRAL EFFICACY |
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Author(s):
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Tetstuya Fujita, Yoshio Nakashima, Mamoru Takamatsu |
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ISBN:
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978-972-8939-52-6 |
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Editors:
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Katherine Blashki |
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Year:
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2011 |
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Edition:
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Single |
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Keywords:
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Age-related Spectral Luminous Efficacy, WCAG 2.0, Luminance Contrast Ratio, Web-safe Colors, Color Universal Design |
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Type:
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Poster/Demonstration |
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First Page:
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489 |
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Last Page:
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491 |
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Language:
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English |
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Cover:
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Full Contents:
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click to dowload 
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Paper Abstract:
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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. |
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