ISO 105-J03:2009提供了一种计算在相同条件下测量的相同材料的两个样品之间的色差的方法，使得数值？总色差的Ecmc（l:c）量化了两个样品不匹配的程度。它允许指定最大值（公差），该最大值仅取决于给定最终用途所需的匹配紧密度，而不取决于所涉及的颜色，也不取决于色差的性质。该方法还提供了用于建立明度与色度和色调的差异的比率的装置。

ISO 105-J03:2009 provides a method of calculating the colour difference between two specimens of the same material, measured under the same conditions, such that the numerical value？E_cmc(l:c) for the total colour difference quantifies the extent to which the two specimens do not match. It permits the specification of a maximum value (tolerance) which depends only on the closeness of match required for a given end-use and not on the colour involved, nor on the nature of the colour difference. The method also provides a means for establishing the ratio of differences in lightness to chroma and to hue.