第一个谷歌结果:https://www.google.com/search?gcx=c&ix=c2&sourceid=chrome&ie=UTF-8&q=ImageMagick's+max+file+size 链接:http://www.imagemagick.org/script/command-line-options.php jpeg:extent=value //Restrict the maximum JPEG file size, for example -define jpeg:extent=400kb.