Get the contrast ratio of two colors represented as a Float.

Formula based on: https://www.w3.org/TR/WCAG20/#contrast-ratiodef

contrastRatio Color.black Color.white -- 21.0


contrastRatio Color.blue Color.blue -- 1.0

Get the relative luminance of a color represented as a Float.

Formula based on: https://www.w3.org/TR/WCAG20/#relativeluminancedef

luminance Color.black -- 0.0


luminance Color.white -- 1.0

Returns the color with the highest contrast to the base color.

bgColor = Color.darkBlue
textOptions = [ Color.white, Color.purple, Color.black ]


maximumContrast bgColor textOptions -- Just Color.white