MidiCMS System Requirements

Windows or Linux / UNIX web server with support for PHP.

GD module is required to access all features of Image Manager.

Most web hosts have GD in their PHP installation, but it does not hurt to check this.

You can also check this yourself by creating a blank file named test.php
 
Only type this into the file:  

<? PHPinfo() ?>

Then upload test.php to your site, and go to your browser and type http://www.domain.com/test.php

In the top of the you will see "Configure Command", and in this where you should look for --with-gd