One of the best feature of Drupal is the image api; that will help you a lot in managing all of your images to make with the help of the module imagecache all kind of modifications, like resize, crop etc..
In PHP you need the GD Graphics Library for dynamically manipulating images. You need to recompile PHP with the GD library of image functions; fortunately apt-get will help us for this to work.
The package is called php5-gd
$ apt-get install php5-gd $ /etc/init.d/apache2 restart
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