This package carefully selects and defines 9 colors for 13 hues each. All colors with the same suffix number have equal luminance level. Also the color black is of level 0, and the color white is of level 10. By simply choosing two colors in the above list, which differ in level by at least 5, as foreground and background colors, you will get proper WCAG Color Contrast.

这个宏包选取 13 种色调，对每种色调定义了 9 个级别的颜色。不同色调相同级别的颜色拥有相同的亮度值。另外黑色的级别为 0，白色的级别为 10。这样，只要选取级别相差至少为 5 的两种颜色，就能得到符合 WCAG 标准的颜色对比度。