When evaluating color proof,it needs to establish a color difference threshold first,the CIE 1976 L*a*b* color difference formula being widely used in color print quality evaluation.

• 在评价数字打样效果时首先要确定一个色差的容限,目前的色彩管理技术中对于色差的评价方法普遍使用CIE 1976L*a*b*色差公式。