ImageMagick generally offers 2 ways to use it:

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

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