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We consider the problem of finding a color scale which performs well whenconverted to a grayscale. We assume that each color is converted to a shade ofgray with the same intensity as the color. We also assume that the color scaleshave a linear variation of intensity and hue, and find scales which maximizethe average chroma (or "colorfulness") of the colors. We find two classes ofsolutions, which traverse the color wheel in opposite directions. The twoclasses of scales start with hues near cyan and red. The average chroma of thescales are 65-77% those of the pure colors.

Color scales that are effective in both color and grayscale