Typo3 4.7 Images don't resize

Of course this problem occurred because there was no ImageMagick available on the server.

However, this problem can easily be solved by installing alt_gd_magick. Jut make sure your GD is enabled, the version is 2.x and that it support all image types you use. You can check it by running a phpinfo file. (Make a phpinfo.php file in your root folder and inside write phpinfo(); between php tags)