ImageMagick

功能十分强大，参见以下详细介绍贴：

裁剪篇：http://www.imagemagick.org/Usage/crop/#crop_equal

各种杂烩篇：http://www.netingcn.com/tag/imagemagicktag

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原文地址：https://www.cnblogs.com/konlil/p/2390349.html

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