imagick是一个PHP的扩展，用ImageMagick提供的API来进行图片的创建与修改，不过这些操作已经包装到扩展imagick中去了，最终调用的是ImageMagick提供的API
ImageMagick是一套软件系列，主要用于图片的创建、编辑以及转换等，详细的解释见ImageMagick的官方网站http://www.imagemagick.org/，ImageMagick与GD的性能要高很多，如果是在处理大量的图片时更加能体现ImageMagick的性能。
英文原文介绍如下：
imagick is a native php extension to create and modify images using the ImageMagick API.
ImageMagick is a software suite to create, edit, and compose bitmap images.. It can read, convert and write images in a variety of formats (over 100) including DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, and TIFF.
著名的图片服务提供商Flickr使用的是ImageMagick，还有Yupoo、手机之家使用的也是ImageMagick。
1.安装ImageMagick
这里主要说说Linux下的安装，Windows下的安装就不说了，Windows下的安装相对简单一些，参考http://www.imagemagick.org/script/install-source.php#windows
由于安装imagick扩展时需要依赖ImageMagick的函数库，因此必须要先安装ImageMagick
从地址ftp://ftp.imagemagick.org/pub/ImageMagick/可以找到ImageMagick的地址
[root@CentOS_Test_Server software]# wget ftp://ftp.imagemagick.org/pub/ImageMagick/ImageMagick-6.5.3-10.tar.gz
--19:26:09-- ftp://ftp.imagemagick.org/pub/ImageMagick/ImageMagick-6.5.3-10.tar.gz
=> `ImageMagick-6.5.3-10.tar.gz'
正在解析主机 ftp.imagemagick.org... 74.63.13.227
Connecting to ftp.imagemagick.org|74.63.13.227|:21... 已连接。
正在以 anonymous 登录 ... 登录成功！
==> SYST ... 完成。 ==> PWD ... 完成。
==> TYPE I ... 完成。 ==> CWD /pub/ImageMagick ... 完成。
==> SIZE ImageMagick-6.5.3-10.tar.gz ... 11151919
==> PASV ... 完成。 ==> RETR ImageMagick-6.5.3-10.tar.gz ... 完成。
长度：11151919 (11M)
100%[=====================================================================================>] 11,151,919 33.4K/s in 3m 9s
19:29:42 (57.7 KB/s) - `ImageMagick-6.5.3-10.tar.gz' saved [11151919]
tar zxvf ImageMagick-6.5.3-10.tar.gz
cd ImageMagick-6.5.3-10
./configure --prefix=/usr/local/imagemagick
make
make install
ImageMagick安装完成以后的目录结构如下：
[root@CentOS_Test_Server imagemagick]# pwd
/usr/local/imagemagick
[root@CentOS_Test_Server imagemagick]# ll
总计 32
drwxr-xr-x 2 root root 4096 07-21 19:59 bin
drwxr-xr-x 3 root root 4096 07-21 20:02 include
drwxr-xr-x 4 root root 4096 07-21 20:07 lib
drwxr-xr-x 5 root root 4096 07-21 20:07 share
bin目录下的这些命令都可以通过命令行方式来操作图片
[root@CentOS_Test_Server imagemagick]# ll bin/
总计 356
-rwxr-xr-x 1 root root 24261 07-21 19:59 animate
-rwxr-xr-x 1 root root 24711 07-21 19:59 compare
-rwxr-xr-x 1 root root 24273 07-21 19:59 composite
-rwxr-xr-x 1 root root 24261 07-21 19:59 conjure
-rwxr-xr-x 1 root root 24261 07-21 19:59 convert
-rwxr-xr-x 1 root root 24261 07-21 19:59 display
-rwxr-xr-x 1 root root 24717 07-21 19:59 identify
-rwxr-xr-x 1 root root 24259 07-21 19:59 import
-rwxr-xr-x 1 root root 1402 07-21 19:59 Magick-config
-rwxr-xr-x 1 root root 1458 07-21 19:59 Magick++-config
-rwxr-xr-x 1 root root 1620 07-21 19:59 MagickCore-config
-rwxr-xr-x 1 root root 1428 07-21 19:59 MagickWand-config
-rwxr-xr-x 1 root root 24261 07-21 19:59 mogrify
-rwxr-xr-x 1 root root 24261 07-21 19:59 montage
-rwxr-xr-x 1 root root 24259 07-21 19:59 stream
-rwxr-xr-x 1 root root 1410 07-21 19:59 Wand-config
[root@CentOS_Test_Server imagemagick]# ll include/
总计 8
drwxr-xr-x 5 root root 4096 07-21 20:07 ImageMagick
[root@CentOS_Test_Server imagemagick]# ll include/ImageMagick/
总计 32
drwxr-xr-x 2 root root 4096 07-21 20:07 magick
drwxr-xr-x 2 root root 4096 07-21 20:07 Magick++
-rw-r--r-- 1 root root 419 07-21 20:07 Magick++.h
drwxr-xr-x 2 root root 4096 07-21 20:07 wand
[root@CentOS_Test_Server imagemagick]# ll lib/
总计 17884
drwxr-xr-x 4 root root 4096 07-21 20:02 ImageMagick-6.5.3
-rw-r--r-- 1 root root 3123344 07-21 19:59 libMagick++.a
-rw-r--r-- 1 root root 5225066 07-21 19:59 libMagickCore.a
-rwxr-xr-x 1 root root 1036 07-21 19:59 libMagickCore.la
lrwxrwxrwx 1 root root 22 07-21 19:59 libMagickCore.so -> libMagickCore.so.2.0.0
lrwxrwxrwx 1 root root 22 07-21 19:59 libMagickCore.so.2 -> libMagickCore.so.2.0.0
-rwxr-xr-x 1 root root 3681379 07-21 19:59 libMagickCore.so.2.0.0
-rwxr-xr-x 1 root root 1089 07-21 19:59 libMagick++.la
lrwxrwxrwx 1 root root 20 07-21 19:59 libMagick++.so -> libMagick++.so.2.0.0
lrwxrwxrwx 1 root root 20 07-21 19:59 libMagick++.so.2 -> libMagick++.so.2.0.0
-rwxr-xr-x 1 root root 2060411 07-21 19:59 libMagick++.so.2.0.0
-rw-r--r-- 1 root root 2360930 07-21 19:59 libMagickWand.a
-rwxr-xr-x 1 root root 1080 07-21 19:59 libMagickWand.la
lrwxrwxrwx 1 root root 22 07-21 19:59 libMagickWand.so -> libMagickWand.so.2.0.0
lrwxrwxrwx 1 root root 22 07-21 19:59 libMagickWand.so.2 -> libMagickWand.so.2.0.0
-rwxr-xr-x 1 root root 1727376 07-21 19:59 libMagickWand.so.2.0.0
drwxr-xr-x 2 root root 4096 07-21 20:07 pkgconfig
通过命令man ImageMagick可以查看ImageMagick手册的内容，特别要注意ImageMagick中的大小写，不要写错了
2.安装PHP的扩展imagick
安装imagick扩展时需要PHP >= 5.1.3，ImageMagick >= 6.2.4
从http://pecl.php.net/package/imagick找到imagick的最新的stable版本
[root@CentOS_Test_Server software]# wget http://pecl.php.net/get/imagick-2.2.2.tgz
--23:08:04-- http://pecl.php.net/get/imagick-2.2.2.tgz
正在解析主机 pecl.php.net... 216.92.131.66
Connecting to pecl.php.net|216.92.131.66|:80... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：77212 (75K) [application/octet-stream]
Saving to: `imagick-2.2.2.tgz.1'
100%[=====================================================================================>] 77,212 35.1K/s in 2.1s
23:08:08 (35.1 KB/s) - `imagick-2.2.2.tgz.1' saved [77212/77212]
cd imagick-2.2.2
用tar zxvf解压.tgz文件时报错，网上说的也是这么解压，还是不行啊，不知道解压报错跟什么有关
[root@CentOS_Test_Server software]# tar zxvf imagick-2.2.2.tgz
package.xml
imagick-2.2.2/examples/polygon.php
imagick-2.2.2/examples/captcha.php
imagick-2.2.2/examples/thumbnail.php
imagick-2.2.2/examples/watermark.php
imagick-2.2.2/config.m4
imagick-2.2.2/config.w32
imagick-2.2.2/CREDITS
imagick-2.2.2/imagick.c
imagick-2.2.2/imagick_class.c
gzip: stdin: invalid compressed data--format violated
tar: 归档文件中异常的 EOF
tar: 归档文件中异常的 EOF
tar: 错误不可恢复：现在退出
phpize是一个shell脚本，主要是用来进行编译环境的准备，执行以后会生成一些新的文件，为配置、编译及安装作好准备
[root@CentOS_Test_Server imagick-2.2.2]# /usr/local/webserver/php/bin/phpize
Configuring for:
PHP Api Version: 20041225
Zend Module Api No: 20060613
Zend Extension Api No: 220060519
执行phpize命令以前目录imagick-2-2-2中的内容
[root@CentOS_Test_Server imagick-2.2.2]# ll
总计 260
-rw-r--r-- 1 root root 4479 02-07 06:11 config.m4
-rw-r--r-- 1 root root 2254 02-07 06:11 config.w32
-rw-r--r-- 1 root root 39 02-07 06:11 CREDITS
drwxr-xr-x 2 root root 4096 07-21 23:09 examples
-rw-r--r-- 1 root root 94719 02-07 06:11 imagick.c
-rw-r--r-- 1 root root 111616 07-21 23:09 imagick_class.c
执行phpize命令以后目录imagick-2-2-2中的内容
[root@CentOS_Test_Server imagick-2.2.2]# ll
总计 1504
-rw-r--r-- 1 root root 74808 07-21 23:12 acinclude.m4
-rw-r--r-- 1 root root 295888 07-21 23:12 aclocal.m4
drwxr-xr-x 2 root root 4096 07-21 23:12 autom4te.cache
drwxr-xr-x 2 root root 4096 07-21 23:12 build
-rwxr-xr-x 1 root root 43499 07-21 23:12 config.guess
-rw-r--r-- 1 root root 1684 07-21 23:12 config.h.in
-rw-r--r-- 1 root root 4479 02-07 06:11 config.m4
-rwxr-xr-x 1 root root 31743 07-21 23:12 config.sub
-rwxr-xr-x 1 root root 453751 07-21 23:12 configure
-rw-r--r-- 1 root root 4646 07-21 23:12 configure.in
-rw-r--r-- 1 root root 2254 02-07 06:11 config.w32
-rw-r--r-- 1 root root 39 02-07 06:11 CREDITS
drwxr-xr-x 2 root root 4096 07-21 23:09 examples
-rw-r--r-- 1 root root 94719 02-07 06:11 imagick.c
-rw-r--r-- 1 root root 111616 07-21 23:09 imagick_class.c
-rw-r--r-- 1 root root 0 07-21 23:12 install-sh
-rw-r--r-- 1 root root 186760 07-21 23:12 ltmain.sh
-rw-r--r-- 1 root root 5694 07-21 23:12 Makefile.global
-rw-r--r-- 1 root root 0 07-21 23:12 missing
-rw-r--r-- 1 root root 0 07-21 23:12 mkinstalldirs
-rw-r--r-- 1 root root 65036 07-21 23:12 run-tests.php
让我们来看看imagick的扩展的配置选项
[root@CentOS_Test_Server imagick-2.2.2]# ./configure --help | more
`configure' configures this package to adapt to many kinds of systems.
Usage: ./configure [OPTION]... [VAR=VALUE]...
To assign environment variables (e.g., CC, CFLAGS...), specify them as
VAR=VALUE. See below for descriptions of some of the useful variables.
Defaults for the options are specified in brackets.
Configuration:
-h, --help display this help and exit
--help=short display options specific to this package
--help=recursive display the short help of all the included packages
-V, --version display version information and exit
-q, --quiet, --silent do not print `checking...' messages
--cache-file=FILE cache test results in FILE [disabled]
-C, --config-cache alias for `--cache-file=config.cache'
-n, --no-create do not create output files
--srcdir=DIR find the sources in DIR [configure dir or `..']
Installation directories:
--prefix=PREFIX install architecture-independent files in PREFIX
[/usr/local]
--exec-prefix=EPREFIX install architecture-dependent files in EPREFIX
[PREFIX]
By default, `make install' will install all the files in
`/usr/local/bin', `/usr/local/lib' etc. You can specify
an installation prefix other than `/usr/local' using `--prefix',
for instance `--prefix=$HOME'.
For better control, use the options below.
Fine tuning of the installation directories:
--bindir=DIR user executables [EPREFIX/bin]
--sbindir=DIR system admin executables [EPREFIX/sbin]
--libexecdir=DIR program executables [EPREFIX/libexec]
--datadir=DIR read-only architecture-independent data [PREFIX/share]
--sysconfdir=DIR read-only single-machine data [PREFIX/etc]
--sharedstatedir=DIR modifiable architecture-independent data [PREFIX/com]
--localstatedir=DIR modifiable single-machine data [PREFIX/var]
--libdir=DIR object code libraries [EPREFIX/lib]
--includedir=DIR C header files [PREFIX/include]
--oldincludedir=DIR C header files for non-gcc [/usr/include]
--infodir=DIR info documentation [PREFIX/info]
--mandir=DIR man documentation [PREFIX/man]
System types:
--build=BUILD configure for building on BUILD [guessed]
--host=HOST cross-compile to build programs to run on HOST [BUILD]
--target=TARGET configure for building compilers for TARGET [HOST]
Optional Features:
--disable-FEATURE do not include FEATURE (same as --enable-FEATURE=no)
--enable-FEATURE[=ARG] include FEATURE [ARG=yes]
--enable-shared=PKGS build shared libraries default=yes
--enable-static=PKGS build static libraries default=yes
--enable-fast-install=PKGS optimize for fast installation default=yes
--disable-libtool-lock avoid locking (might break parallel builds)
Optional Packages:
--with-PACKAGE[=ARG] use PACKAGE [ARG=yes]
--without-PACKAGE do not use PACKAGE (same as --with-PACKAGE=no)
--with-libdir=NAME Look for libraries in .../NAME rather than .../lib
--with-php-config=PATH Path to php-config php-config
--with-imagick=DIR Enables the imagick extension. DIR is the prefix to Imagemagick installation directory.
--with-imagick-gm=DIR GraphicsMagick backend. NO LONGER SUPPORTED!
--with-gnu-ld assume the C compiler uses GNU ld default=no
--with-pic try to use only PIC/non-PIC objects default=use both
--with-tags=TAGS include additional configurations automatic
Some influential environment variables:
CC C compiler command
CFLAGS C compiler flags
LDFLAGS linker flags, e.g. -L<lib dir> if you have libraries in a
nonstandard directory <lib dir>
CPPFLAGS C/C++ preprocessor flags, e.g. -I<include dir> if you have
headers in a nonstandard directory <include dir>
CPP C preprocessor
Use these variables to override the choices made by `configure' or to help
it to find libraries and programs with nonstandard names/locations.
./configure --with-php-config=/usr/local/webserver/php/bin/php-config --with-imagick=/usr/local/imagemagick
编译过程中如果报错，则通过ln -s把ImageMagick的so及la文件链接到/usr/lib目录下，如果不报错，则不需要做链接，我原来是由于安装包不对，导致用tar zxvf解压的时候文件解出来的不全，例如一些.h文件都没有解压出来，所以编译当然会报错了，因此我才加了下面这些链接，后来编译还是报错。
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagickCore.so /usr/lib/libMagickCore.so
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagickCore.so.2 /usr/lib/libMagickCore.so.2
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagickCore.la /usr/lib/libMagickCore.la
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagick++.so /usr/lib/libMagick++.so
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagick++.so.2 /usr/lib/libMagick++.so.2
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagick++.la /usr/lib/libMagick++.la
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagickWand.so /usr/lib/libMagickWand.so
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagickWand.so.2 /usr/lib/libMagickWand.so.2
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagickWand.la /usr/lib/libMagickWand.la
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagickCore.so.2.0.0 /usr/lib/libMagickCore.so.2.0.0
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagick++.so.2.0.0 /usr/lib/libMagick++.so.2.0.0
[root@CentOS_Test_Server lib]# ln -s /usr/local/imagemagick/lib/libMagickWand.so.2.0.0 /usr/lib/libMagickWand.so.2.0.0
make
小记编译imagick扩展遇到的郁闷的问题
由于原来在目录/home/software下已经有文件imagick-2.2.2.tgz，这个文件是在vista下面下载后，通过Vmware共享给CentOS的，后来我通过wget又下载了一个，很巧的是也同样还是这个版本，文件名一模一样，因此新下载的imagick扩展自动命名为imagick-2.2.2.tgz.1，wget的下载日志“23:08:08 (35.1 KB/s) - `imagick-2.2.2.tgz.1' saved [77212/77212]”，解压的时候解的仍然是vista下面下载的那个文件，因此导致解压的时候报错，解压出来的文件不全，因此导致编译报错，可能是与安装包的格式有关吧，参考http://linux.chinaunix.net/bbs/thread-1026205-1-1.html，与这个有点类似吧，通过wget下载的安装包应该是不会出现这个问题的，然后rm imagick-2.2.2.tgz，mv imagick-2.2.2.tgz.1 imagick-2.2.2.tgz，tar zxvf imagick-2.2.2.tgz，解压后正常，说明是安装包的问题，然后后来的一切就都正常了。
make install也就是把编译生成的so文件拷贝到php的扩展目录下
[root@CentOS_Test_Server imagick-2.2.2]# make install
/bin/sh /home/software/imagick-2.2.2/libtool --mode=install cp ./imagick.la /home/software/imagick-2.2.2/modules
cp ./.libs/imagick.so /home/software/imagick-2.2.2/modules/imagick.so
cp ./.libs/imagick.lai /home/software/imagick-2.2.2/modules/imagick.la
PATH="$PATH:/sbin" ldconfig -n /home/software/imagick-2.2.2/modules
----------------------------------------------------------------------
Libraries have been installed in:
/home/software/imagick-2.2.2/modules
If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
- add LIBDIR to the `LD_LIBRARY_PATH' environment variable
during execution
- add LIBDIR to the `LD_RUN_PATH' environment variable
during linking
- use the `-Wl,--rpath -Wl,LIBDIR' linker flag
- have your system administrator add LIBDIR to `/etc/ld.so.conf'
See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------
Installing shared extensions: /usr/local/webserver/php/lib/php/extensions/no-debug-non-zts-20060613/
查看so文件是否已经生成，发现imagick.so文件已经在php的扩展目录下面了，证明已经安装成功
[root@CentOS_Test_Server imagick-2.2.2]# ll /usr/local/webserver/php/lib/php/extensions/no-debug-non-zts-20060613/
总计 3040
-rwxr-xr-x 1 root root 172209 05-17 19:07 db4.so
-rwxr-xr-x 1 root root 517843 04-28 20:55 eaccelerator.so
-rwxr-xr-x 1 root root 748762 07-22 03:30 imagick.so
-rwxr-xr-x 1 root root 185627 04-28 20:38 memcache.so
-rwxr-xr-x 1 root root 118580 04-28 22:23 pdo_mysql.so
-rwxr-xr-x 1 root root 1308827 07-08 19:10 xapian.so
3.相关配置
vi /usr/local/webserver/php/etc/php.ini，加入如下的一行
extension = "imagick.so"
然后执行php -m | grep imagick，发现已经出现imagick模块了，证明imagick已经生效了
[root@CentOS_Test_Server imagick-2.2.2]# php -m | grep imagick
imagick
上面只是命令行生效了，为了让web服务器也生效，必须要重启php-fpm(我的环境是Nginx+fastcgi方式执行的php)
[root@CentOS_Test_Server imagick-2.2.2]# /usr/local/webserver/php/sbin/php-fpm restart
Shutting down php_fpm . done
Starting php_fpm done
vi index.php,输入如下的内容
<?php
phpinfo()
?>
在浏览器执行index.php即可看到模块imagick已经生效
4.测试
PHP的imagick安装以后，提供4个PHP的图片处理类，分别是Imagick、ImagickDraw、ImagickPixel、ImagickPixelIterator，可以参考PHP的英文手册(一般指的是chm格式的手册，可以下载到本地查阅)或者在线手册(http://cn.php.net/imagick)
可以用两种方式进行调用，一种方式是直接调用/usr/local/imagemagick/bin目录下的命令，第二种方式是调用PHP的imagick扩展提供的api
测试一,通过php扩展进行调用
vi /home/htdocs/www/imagick_test1.php，输入如下的代码
<?php
header('Content-type: image/jpeg');
$image = new Imagick('old_s.jpg');
// If 0 is provided as a width or height parameter,
// aspect ratio is maintained
$image->thumbnailImage(100, 0);
echo $image;
?>
然后在浏览中执行，即可看到一张100px × 80px的图片，old_s是大S的意思，也就是我是用大S的照片做的测试，在这里就不截图了，其它的例子大家看手册基本就会用了
另外可以在上述文件中的第一行加入判断模块imagick已经安装或加载的代码，extension_loaded('imagick') or die('imagick not loaded');
测试二,通过命令行进行调用
进入到图片所在目录
cd /home/htdocs/www
/usr/local/imagemagick/bin/convert old_s.jpg -resize 50% old_s.png
原来的图片old_s.jpg是800*640，转换后生成的图片old_s.png是400*320，刚好减少一半
每个命令的选项少的有几十个，多的则有上百个选项，非常复杂，功能非常的强大，参考http://www.imagemagick.org/script/command-line-tools.php
另外，Discuz采用了ImageMagick及GD两种方式来处理图片，Discuz7.0版本有个文件Discuz_7.0.0_SC_GBK/upload/include/image.class.php,基中的方法Thumb_IM及Watermark_IM使用的就是ImageMagick，大家可以参考一下Discuz的代码。
BTW:我写这篇博客是用的笔记本电脑的电池，因为有一段时间没有用笔记本电脑的电池了，以后每月尽量充放电一次，以保持电池的容量，电池大概用了二个小时零10分钟吧，还算可以
参考：
ImageMagick百度百科：http://baike.baidu.com/view/1109708.htm
ImageMagick中文站：http://www.imagemagick.com.cn/
ImageMagick英文站：http://www.imagemagick.org/
imagemagick安装英文文档：http://www.imagemagick.org/script/install-source.php
ImageMagick的ftp下载地址：ftp://ftp.imagemagick.org/pub/ImageMagick/
ImageMagick的api: http://www.imagemagick.org/script/api.php
ImageMagick的命令行参考文档：http://www.imagemagick.org/script/command-line-tools.php
ImageMagick的PHP手册：http://cn.php.net/imagick
ImageMagick的PHP扩展：http://pecl.php.net/package/imagick