I've looked through several StackExchange threads without specifics on how ImageMagick is tied into Craft. Web host says the binary is installed on server but not the module. Is the PHP module required?
we looked into this further, and found that we do not have the ImageMagick PHP module installed, but we do have the binary. I'm not sure if Craft needs the PHP module, but if it does, that would be the reason for this not working.