Install ImageMagick On Mac OS X
ImageMagick itself has good documentation for installing ImageMagick on Mac OS X with the binary release that they provide. Here's the condensed version:
If you have shell access to the OS X system, then perhaps the easiest option is to download the binary ImageMagick distribution and create a new directory to extract it to, for example /opt/im/. Then in your application (like FileChucker) which needs to use say ImageMagick's convert command, you'd just set the command to:
...of course adjusting the version number in the path as necessary. The fact that that's a long and unwieldy command is OK because you'll just be setting it one time in a configuration option and then forgetting about it.
The other option would be to install MacPorts on the Mac. This can apparently be done via the shell and therefore via SSH, but it's probably best done via Screen Sharing / VNC / Remote Desktop, and is probably even straightforward enough to ask the non-tech person who's in front of the Mac to do this GUI portion. In any case, once MacPorts is installed, it's then trivial to install ImageMagick: just run the command "sudo port install ImageMagick".