Contrast

contrastingColor()

function contrastingColor(input: ColorInput): "#000" | "#fff"

Accepts a supported color string or an RGBA, then returns the ink, black or white, with the higher WCAG contrast ratio against it. Alpha does not affect the result. An unparseable string throws ColorParseError.

import { contrastingColor } from "@jolly-pixel/color";

contrastingColor("#ffffff");  // "#000"
contrastingColor("#ff0000");  // "#000"
contrastingColor("#277da1");  // "#fff"

• Grays switch from white to black ink between #757575 and #767676.
• Use it for editor outlines, casings and labels drawn over a user color.