ImageMagick

is a powerful suite of tools in Ubuntu for scripting batch manipulations of images. Conversion between formats, resizing and hundreds of sophisticated filters can all be automated with only a few keystrokes. For that reason, it is popular with web developers, photographers and other users who have a large number of images that must be manipulated in the same way repeatedly. ImageMagick is not included with Ubuntu by default, but it can be installed easily using the “apt-get” tool. Your computer will need to be connected to the Internet while the install takes place.

Troubleshooting:

1. When I try to install imagemagick, the terminal asks me if I can get
several errors, saying that things are not found. This is what it says:

ubuntu@ubuntu:~$ sudo apt-get install imagemagick
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
imagemagick-common liblcms1 liblqr-1-0 libmagickcore4 libmagickwand4
Suggested packages:
imagemagick-doc autotrace cups-bsd lpr lprng curl enscript ffmpeg gimp
gnuplot grads groff-base hp2xx html2ps libwmf-bin povray radiance sane-utils
texlive-base-bin transfig ufraw-batch liblcms-utils
Recommended packages:
libmagickcore4-extra netpbm
The following NEW packages will be installed:
imagemagick imagemagick-common liblcms1 liblqr-1-0 libmagickcore4
libmagickwand4
0 upgraded, 6 newly installed, 0 to remove and 209 not upgraded.
Need to get 2168 kB/2284 kB of archives.
After this operation, 6010 kB of additional disk space will be used.
Do you want to continue [Y/n]? Y
Err http://ports.ubuntu.com/ubuntu-ports/ precise-updates/main
imagemagick-common all 8:6.6.9.7-5ubuntu3.2
404 Not Found
Err http://ports.ubuntu.com/ubuntu-ports/ precise-updates/main
libmagickcore4 armhf 8:6.6.9.7-5ubuntu3.2
404 Not Found
Err http://ports.ubuntu.com/ubuntu-ports/ precise-updates/main
libmagickwand4 armhf 8:6.6.9.7-5ubuntu3.2
404 Not Found
Err http://ports.ubuntu.com/ubuntu-ports/ precise-updates/main
imagemagick armhf 8:6.6.9.7-5ubuntu3.2
404 Not Found
Failed to fetch
http://ports.ubuntu.com/ubuntu-ports/pool/main/i/imagemagick/imagemagick-common_6.6.9.7-5ubuntu3.2_all.deb
404 Not Found
Failed to fetch
http://ports.ubuntu.com/ubuntu-ports/pool/main/i/imagemagick/libmagickcore4_6.6.9.7-5ubuntu3.2_armhf.deb
404 Not Found
Failed to fetch
http://ports.ubuntu.com/ubuntu-ports/pool/main/i/imagemagick/libmagickwand4_6.6.9.7-5ubuntu3.2_armhf.deb
404 Not Found
Failed to fetch
http://ports.ubuntu.com/ubuntu-ports/pool/main/i/imagemagick/imagemagick_6.6.9.7-5ubuntu3.2_armhf.deb
404 Not Found
E: Unable to fetch some archives, maybe run apt-get update or try with
--fix-missing?

Fix:

It means have a problem with your network about http://ports.ubuntu.com
please sure that it can open http://ports.ubuntu.com on the browser.
and than install imagemagick.

ubuntu@ubuntu:~$ sudo apt-get install imagemagick
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  python-pycurl unattended-upgrades python-gnupginterface
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  imagemagick-common liblcms1 liblqr-1-0 libmagickcore4 libmagickwand4
Suggested packages:
  imagemagick-doc autotrace cups-bsd lpr lprng curl enscript ffmpeg gimp
  gnuplot grads groff-base hp2xx html2ps libwmf-bin povray radiance sane-utils
  texlive-base-bin transfig ufraw-batch liblcms-utils
Recommended packages:
  libmagickcore4-extra netpbm
The following NEW packages will be installed:
  imagemagick imagemagick-common liblcms1 liblqr-1-0 libmagickcore4
  libmagickwand4
0 upgraded, 6 newly installed, 0 to remove and 1 not upgraded.
Need to get 2281 kB of archives.
After this operation, 6010 kB of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 http://ports.ubuntu.com/ubuntu-ports/ precise/main liblcms1 armhf 1.19.dfsg-1ubuntu3 [87.3 kB]
Get:2 http://ports.ubuntu.com/ubuntu-ports/ precise/main liblqr-1-0 armhf 0.4.1-1.1 [29.4 kB]
Get:3 http://ports.ubuntu.com/ubuntu-ports/ precise-security/main imagemagick-common all 8:6.6.9.7-5ubuntu3.3 [40.3 kB]
Get:4 http://ports.ubuntu.com/ubuntu-ports/ precise-security/main libmagickcore4 armhf 8:6.6.9.7-5ubuntu3.3 [1729 kB]
Get:5 http://ports.ubuntu.com/ubuntu-ports/ precise-security/main libmagickwand4 armhf 8:6.6.9.7-5ubuntu3.3 [346 kB]
Get:6 http://ports.ubuntu.com/ubuntu-ports/ precise-security/main imagemagick armhf 8:6.6.9.7-5ubuntu3.3 [49.2 kB]
Fetched 2281 kB in 37s (60.4 kB/s)                                             
Selecting previously unselected package liblcms1.
(Reading database ... 65241 files and directories currently installed.)
Unpacking liblcms1 (from .../liblcms1_1.19.dfsg-1ubuntu3_armhf.deb) ...
Selecting previously unselected package liblqr-1-0.
Unpacking liblqr-1-0 (from .../liblqr-1-0_0.4.1-1.1_armhf.deb) ...
Selecting previously unselected package imagemagick-common.
Unpacking imagemagick-common (from .../imagemagick-common_8%3a6.6.9.7-5ubuntu3.3_all.deb) ...
Selecting previously unselected package libmagickcore4.
Unpacking libmagickcore4 (from .../libmagickcore4_8%3a6.6.9.7-5ubuntu3.3_armhf.deb) ...
Selecting previously unselected package libmagickwand4.
Unpacking libmagickwand4 (from .../libmagickwand4_8%3a6.6.9.7-5ubuntu3.3_armhf.deb) ...
Selecting previously unselected package imagemagick.
Unpacking imagemagick (from .../imagemagick_8%3a6.6.9.7-5ubuntu3.3_armhf.deb) ...
Setting up liblcms1 (1.19.dfsg-1ubuntu3) ...
Setting up liblqr-1-0 (0.4.1-1.1) ...
Setting up imagemagick-common (8:6.6.9.7-5ubuntu3.3) ...
Setting up libmagickcore4 (8:6.6.9.7-5ubuntu3.3) ...
Setting up libmagickwand4 (8:6.6.9.7-5ubuntu3.3) ...
Setting up imagemagick (8:6.6.9.7-5ubuntu3.3) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
ubuntu@ubuntu:~$ 

More information:
http://www.imagemagick.org/