Function Signature

js

deltaE2000(hexA: string, hexB: string, options?: { kL?: number, kC?: number, kH?: number }): number

Parameters

hexA (string): First HEX color.
hexB (string): Second HEX color.
options.kL, options.kC, options.kH (number, optional): Parametric weighting factors. Each defaults to 1.

A numeric Delta E value. Lower values indicate more visually similar colors.

js

deltaE2000("#ffffff", "#ffffff");
// 0

deltaE2000("#ff6600", "#ff6700");
// small number

deltaE2000("#ff6600", "#0066ff");
// larger number

Prefer this over deltaE76 when visual similarity matters.
Useful for deduplicating palettes, comparing design tokens, and measuring generated color variation.
Inputs are converted from HEX to Lab internally.