INSTALL.txt file modification

OK. This is true for the 4.5.0 version of image.module: You cannot call ImageMagick or any other program run by exec() in php if your php is running in safe_mode on, and this program is not on the "safe_mode_exec_dir" path. Solutions for this:
1. Turn safe_mode off
or
2. Ask your provider to put the following line inside your VirtualHost block in your httpd.conf:
php_admin_flag safe_mode Off
(It does not work for .htaccess since php_admin_* directives are not recognized there)
Apache has to be restarted.
Maybe there are other possibilities like using symlinks; not tested.

I think this should go into the INSTALL.txt file of the image.module, since so many people (and myself) had/have trouble with this.

Excelent module.