Abstract
Living environments entail the extensive use of colors that dichromats cannot easily distinguish. In this regard, simulations have been performed to evaluate the visual performance of the dichromat and facilitate quantitative color analysis. To achieve quantitative optimization of colors in subway maps with a wide range of colors, we propose a method for evaluating them in terms of visibility and color differentiation of dichromats as the first step. The map is transformed into one that simulates the visual performance of a dichromat. In both maps, two parameters, luminance contrast and color difference, are measured between each line and its background, as well as between two lines. By analyzing the changes in these parameters before and after the transformation, we identify subway lines and combinations of two lines that the dichromats cannot easily distinguish. In addition, the deterioration in visibility and distinguishability can be visualized. The results indicate that the proposed method is effective for quantitatively analyzing the colors of subway maps.
