通过分析胶印中纸张对油墨的吸收特点，基于图像分析法对反映墨点质量的面积扩散比、边缘粗糙度、圆度和保真度等指标进行了检测，利用Media Cybernetics公司Image-Pro Plus 6.0软件对数字图像进行处理，获得了实验数据。通过对4种铜版纸的实验数据分析，对铜版纸胶印墨点质量进行了评价，并通过与密度和色度测试结果对比，证明了此方法的可行性和实用性。

The characteristic of paper absorbing ink phenomena in offset printing was analyzed. Using image analysis method, area spot ratio, edge raggedness, and roundness degree which can indicate dot fidelity were tested. Image-Pro Plus 6.0 software was used to process digital image to get data. Through the data analysis of four kinds of coated papers, dot fidelity of offset printing was evaluated. This method was proved to be feasible and usable by comparing with the result of density and colorimetric values.