Image manipulation libraries

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Table of Contents
  1. PHP
  2. Command line
    1. ImageMagick

PHP

See the libraries: Exif , GD , ImageMagick , Gmagick, Cairo:
http://php.net/manual/en/refs.utilspec.image.php

Ubuntu packages:

php5-exactimage - fast image manipulation programs (PHP bindings)
php5-imagick - ImageMagick module for php5

Command line

Here is a list of some relevant packages available on Ubuntu:

imagemagick - image manipulation programs                               
imagemagick-doc - document files of ImageMagick                         
exactimage - fast image manipulation programs
graphicsmagick - collection of image processing tools
libvips-tools - image processing system good for very large images (tools)
octave-image - image manipulation for Octave

ImageMagick

http://en.wikipedia.org/wiki/ImageMagick
http://www.imagemagick.org/

ImageMagick scripts:
http://www.fmwconcepts.com/imagemagick/