All colorimetric terminology has a basis, usually related to light and perception, but some terms can be a little arbitrary.
The “E” in delta E or delta E* is derived from “Empfindung“, the German word for sensation. Delta E means a “difference in sensation” for any delta E-type metric, CIE or Hunter.
所有的色度学术语都有一个基础，通常与光和感知有关，但有些术语可以是任意的。
E是来自于德语：Empfindung 是感觉、知觉的意思。
Delta E 就是“感觉上的差异”