I also spent some time with the smudge tool getting rid of perfectly straight lines and roughing up random areas of the image.
我也用了大量的时间使用模糊工具来模糊原来完美的线条，并且随机模糊了图片某些区域。
2
The paper presents reasons and preventing measures for crack of big blank cap happened in roughingtool, which can give some reference for such machine production in future.