抄録
The approach of the accessibility is necessary for all the people to be able to use the Internet. As the visual elements are very important factors in the Internet, in our previous study, the visibilities of young adults, the elderly and dichromatic vision persons were evaluated on white background using the simulation filters. In this report, we evaluated the visibilities between black background and 21 foreground colors, and developed the expression for visibility prediction by the multiple regression analysis using color brightness difference and color difference which was derived from RGB value. As the results, as is the case in the white background, the visibility was correlated with color difference. Moreover, it was shown that all group's visibility is judged high when the range for color brightness difference is 120.3 or more.
