zimg
http://zimg.buaa.us/documents/design_of_zimg_new_generation/
http://zimg.buaa.us/documents/Architecture_Design_of_Image_Server/
https://github.com/buaazp/zimg
http://www.oschina.net/p/bolt-img
https://git.oschina.net/liexusong/bolt
Nginx图片剪裁模块 http_image_filter_module
http://cwtea.blog.51cto.com/4500217/1333142
http://www.oschina.net/p/evathumber
https://github.com/AlloVince/EvaThumber
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