[模块文档]
安装 ImageMagick 遇到的常见问题
问题 attempt to perform an operation not allowed by the security policy转换出现 convert: attempt to perform an operation not allowed by the security policy PDF @ error/constitute.c/IsCoderAuthorized/421.\nconvert: no images defined。出现这个问题是因为 ImageMagick 默认禁用了对 PDF 文件的处理。解决方法是，修改文件 /etc/ImageMagick-6/policy.xml，只需要注释掉以下内容：<!-- disable ghostscript forma...
