印刷网点面积率是评价印刷品质量的重要指标。在CIE L*a*b*色空间中，通过爬山聚类算法对彩色网点图像进行了分割，并经过适当的后续处理获得了良好的分割效果，为研制网点评价系统奠定了一定的基础。

Dot area is an important index for evaluation of printing quality. Color dot image was segmented by hill climbing clustering algorithm in CIE L*a*b* color space. Good result of image segmentation was achieved by means of proper postprocessing. The provide base for construction of dot area evaluation system.