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1 2017

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A method for converting colors for color-impaired people, considering saturation and contrast ratio

Shirogane Junko, Iwase Yuko, Iwata Hajime, Saito Miho, Fukazawa Yoshiaki

Annals of Computer Science and Information Systems

2017

Vol. 13

357--366

Because color-impaired people have difficulty in perceiving specific colors, colors used in documents must be converted for them. The colors of documents include the intentions of their designers. That is, designers use different colors for parts of the document that they want to be attractive or distinguishable in some way. In existing conversion methods, however, colors are not converted based on a consideration of the designers' intentions. Hence, we propose a method for converting document colors for color-impaired people in a manner that takes the designers' intentions into account. Here, we define the designers' intentions as ``attractiveness'' and ``distinguishability.'' In our method, the original colors are classified into three levels, low, middle, and high, based on their saturation. In each saturation level, some colors are defined as available for conversion. Next, the original colors are converted to colors in the corresponding saturation levels. According to the RGB (red-green-blue) values of the original colors, the target colors for conversion can be specified. Then, the contrast ratios of the pair of foreground and background colors are calculated. If the contrast ratios do not satisfy the specific thresholds, the colors are additionally converted to other colors in the corresponding saturation levels. Finally, when the contrast ratios satisfy the specific thresholds, the conversion is complete.