ImageMagick generally offers 2 ways of use:

1. As a module in PHP, by calling the appropriate PHP functions – see PHP documentation: Image Processing (ImageMagick)
2. By calling ImageMagick binaries through the command line (shell) by using shell_exec(). In this case, the PHP applications require the full path to the program.

Our web hosting only offers the first option. Calling a shell command is disabled and cannot be allowed. Your PHP application must be able to use the first option.