安装命令：yum install ImageMagick

=====================================================================================================================================================
 Package                                             Arch                  Version                                      Repository              Size
=====================================================================================================================================================
Installing:
 ImageMagick                                         x86_64                6.9.10.68-3.el7                              base                   2.3 M
Installing for dependencies:
 OpenEXR-libs                                        x86_64                1.7.1-7.el7                                  base                   217 k
 adobe-mappings-cmap                                 noarch                20171205-3.el7                               base                   2.1 M
 adobe-mappings-cmap-deprecated                      noarch                20171205-3.el7                               base                   114 k
 adobe-mappings-pdf                                  noarch                20180407-1.el7                               base                   703 k
 cairo                                               x86_64                1.15.12-4.el7                                base                   741 k
.......


SYNOPSIS
       convert [input-option] input-file [output-option] output-file



convert 2019-12-30-17-03-10.png -resize 30% 2019-12-30-17-03-10-yasuo.png
convert 2019-12-30-17-03-10.png -resize 10% 2019-12-30-17-03-10-yasuo.png
magick convert rose.jpg -resize 50% rose.png

如果想降低图片的质量,可以用 convert 的 -quality 参数,质量值为 0-100 之间的数值,数字越大,质量越好,一般指定 70-80 ,基本上看不出前后的差别

大于200KB的图片都启用超级压缩

cp -a `find /xdata/xdocs/image -type f -mtime -2 -regex '.*\(jpg\|JPG\|png\|PNG\|jpeg\)' -size +200k` /xdata/low-image
cd /xdata/low-image && find . -type f -mtime -2 -regex '.*\(jpg\|JPG\|png\|PNG\|jpeg\)' -size +200k -exec convert -resize 10% {} {} \;

/xdata/low-image    存放低质量，超级压缩过后的图片(10倍压缩)
/xdata/xdocs/image  高清原图


grep -Rl "md-images" content/

[root@as4k low-xdocs]# grep -R "md-images" content/ | head
content/shell-script/all-shell-scripts.md:![](http://xdocs-images.all.xingyongsheng.top/2020-03-23-17-26-12.png)
content/shell-script/all-shell-scripts.md:![](http://xdocs-images.all.xingyongsheng.top/2020-05-05-10-40-56.png)
content/shell-script/循环.md:![](http://xdocs-images.all.xingyongsheng.top/2020-03-26-17-47-58.png)
content/shell-script/变量.md:![](http://xdocs-images.all.xingyongsheng.top/2020-03-25-10-29-07.png)


[root@as4k low-xdocs]# sed 's#md-images\.as4k\.top:8001#md-images\.as4k\.top:9001#g' content/shell-script/all-shell-scripts.md | grep md-images
![](http://xdocs-images.all.xingyongsheng.top/2020-03-23-17-26-12.png)
![](http://xdocs-images.all.xingyongsheng.top/2020-05-05-10-40-56.png)


sed 's#md-images\.as4k\.top:8001#md-images\.as4k\.top:9001#g' `grep -Rl "md-images" /xdata/low-xdocs/content`

sed 's#http://md-images\.as4k\.top:8001#https://gitee\.com/as4k/xdocs/raw/master/image#g' `grep -Rl "md-images" /xdata/low-xdocs/content`

sed 's#http://md-images\.as4k\.top:8001#https://gitee\.com/as4k/xdocs/raw/master/image#g' `grep -Rl "md-images" /xdata/xdocs/content`


https://gitee\.com/as4k/xdocs/raw/master/image/2019-12-10-10-45-02.png



sed -i 's#md-images\.as4k\.top:8001#md-images\.as4k\.top:9001#g' `grep -Rl "md-images" /xdata/low-xdocs/content`


cd /xdata/low-xdocs/image && find . -type f -regex '.*\(jpg\|JPG\|png\|PNG\|jpeg\)' -size +200k -exec convert -resize 10% {} {} \;