Imagemagick on CentOS and Plesk

root@server ~]# yum install ImageMagick
[root@server ~]# yum install ImageMagick-devel

PHP-imagick Installation:
[root@server ~]# yum install gcc
[root@server ~]# yum install make automake
[root@server ~]# yum install php-pear
[root@server ~]# yum install php-devel
[root@server ~]# pecl install imagick

On some servers

yum install php-pecl-imagick.x86_64

Test:

convert image.jpg -resize 64x64 resize_image.jpg