首先将颜色转换为实验室。设计此颜色空间时，要使任意两种颜色之间的矢量差都接近主观距离。

first convert the colors to Lab. This colorspace is designed so that the vectorial difference between any two colors closely approximate a 'subjective distance'.

在颜色管理中，将 delta E值指定为衡量给定颜色转换在感知上的忠实度的度量。只是实验室空间中表示的原始颜色和最终颜色之间的矢量差的大小。

In color management, a 'delta E' value is given as a measure of how perceptually faithful a given color transformation is. it's just the magnitude of the vector difference between original and final colors as expressed in Lab space.