Today I read a paper titled “Color scales that are effective in both color and grayscale”
The abstract is:
We consider the problem of finding a color scale which performs well when converted to a grayscale
We assume that each color is converted to a shade of gray with the same intensity as the color
We also assume that the color scales have a linear variation of intensity and hue, and find scales which maximize the average chroma (or “colorfulness”) of the colors
We find two classes of solutions, which traverse the color wheel in opposite directions
The two classes of scales start with hues near cyan and red
The average chroma of the scales are 65-77% those of the pure colors