Revision of the dE94 formula, released in 2000. Unlike delta E 94, which assumes that L* correctly reflects the perceived differences in lightness, delta E 2000 varies the weighting of L* depending on where in the lightness range the color falls.

This formula uses an equation (l:c:h) which allows the setting of lightness, chroma and hue factors. Most common are the following factors:

• Delta E 2000 1:1:1

  Equal weighting of lightness, chroma and hue. These are the default factors. This formula is usually abbreviated as Delta E 2000.

• Delta E 2000 2:1:1

  Lightness has twice the weighting of chroma and hue.