Is the ∆E (Delta E) calculation for the color lookup based on CIE L*a*b* or CMC? Boris Bergmann August 31, 2021 13:36 The ∆E (Delta E) calculation is based on CIE L*a*b* D65/10° Related articles What is the general life of the ColorReader and its battery? What does the Triangle number mean? What fan decks are available in North/South America, in Europe and in Asia on the ColorReader / ColorReader EZ / ColorReader PRO that sold by Datacolor or Amazon? I am getting Invalid Calibration on my ColorReader / ColorReader EZ / ColorReader PRO and my colors are coming wrong Why is my ColorReader PRO only displaying Lab values for the measured colors on the internal screen?