ImageMagick download address:
http://www.imagemagick.org/script/download.php
Source code download address:
http://www.imagemagick.org/script/install-source.php
Get closer to it: https://www.imagemagick.org/download/
wget https://www.imagemagick.org/download/ImageMagick.tar.gz
tar zxf ImageMagick.tar.gz
cd ImageMagick-7.0.4-6/
./configure --prefix=/data/server/ImageMagick
make
make install
php extension download address: http://pecl.php.net/package/imagick
wget http://pecl.php.net/get/imagick-3.4.3RC4.tgz
tar zxf imagick-3.4.3RC4.tgz
cd imagick-3.4.3RC4
# Replace the following sentence with the location of your phpize
/data/server/php/bin/phpize
./configure --with-php-config=/data/server/php/bin/php-config --with-imagick=/data/server/ImageMagick
make
make install
Imagick usage:
convert Converts image formats and sizes, blurs, crops, removes stains, dithers, nears, draws images on top of images, adds new images, generates thumbnails, and more.
identify Describes the format and characteristics of one or more image files.
composite Generate a picture from a picture or a combination of multiple pictures
I often use identify:
/data/server/ImageMagick/bin/identify test.jpg
test.jpg JPEG 1920x1080 1920x1080+0+0 8-bit sRGB 1.255MB 0.000u 0:00.000
这里能看到图片的格式和长宽，以及大小等信息。
利用ImageMagick进行图片修改：
1、转换格式：
/data/server/ImageMagick/bin/convert test.jpg test.png
2、缩放：
/data/server/ImageMagick/bin/convert test.jpg -resize 1000x200 200.jpg
可以看到，原大小为1920x1080的图片，按照1000x200缩放以后，其实是按照更小的系数来缩放，保证高度200，宽度则小于1000，尺寸为：356x200.
当然可以只指定宽度来缩放：
/data/server/ImageMagick/bin/convert test.jpg -resize 1000 1000.jpg
转换结果是1000x563的图片。
也可以只按照高度来缩放：
/data/server/ImageMagick/bin/convert test.jpg -resize x200 200.jpg
其它用法比如批量处理、水印等功能请百度。