Abstract
The web accessibility is necessary for all the Internet users, and the visual elements are very important factors. In our previous study, the visibilities of achromatic backgrounds were evaluated on young adults, the elderly and dichromatic vision persons with simulation filters. Moreover, we have shown that it is possible to predict the visibility by multiple regression analysis as explanatory variable which brightness difference and color difference calculated by the RGB value. In this paper, the integrated evaluation was performed based on the visibility prediction results of white and black backgrounds. As the results, the visibility level was distinctly-divided by brightness difference and color difference. For details, it was shown that visibility of web-safe colors was estimated high when brightness difference (L) and color difference (E) were the following range. If brightness difference is in the less than 152.7, color difference in range of E<65.8L-9593, if brightness difference is in 152.7-153.0, color difference in range of E≤16.0L-1989, or if brightness difference is equal to 153.0 or more, color difference in range of E≤8.77L-883.1.
