在标准图像和待测图像配准的基础上，采用几何插值法进行RGB到Lab的色彩空间转换。首先在原色空间中进行了非均匀分割，建立了查找表，然后在分割得到的栅格中应用四面体插值算法完成了到目标空间的转换，并且计算了对应点的色差，对转换后的色差分布进行了分析，以用于对印刷品是否存在偏色进行判定，效果较好。

During in printing quality inspection, the inspection of hue error is an important content. Geometrical lookup table with interpolation was applied to process the color space transformation (RGB to Lab) based on the registration of standard printed mater and printing mater. Firstly, source color space was divided unevenly and the relevant lookup table was established. The divided grids were transformed to target color space with tetrahedron geometrical interpolation algorithm. The color difference of corresponding points was calculated and the distribution of color difference was analyzed. The results were used to evaluate the color deflection of presswork. It was proved that this method has good effect.