# 1、安装 ```bash convert 11.pdf 11.png convert-im6.q16: not authorized 11.pdf' @ error/constitute.c/ReadImage/412. convert-im6.q16: no images defined11.png' @ error/convert.c/ConvertImageCommand/3258. #sudo vi /etc/ImageMagick-6/policy.xml ``` # 2、常用命令 ```sh # 彩色变黑白 convert -colorspace Gray 13.pdf 113.pdf ```