I want use a imagemagick node-imagemagick to do some job about image, but beside install this module in my app, I have install the imagemagick into my computer?
the problem is my application is deploy on Paas platform, I don't think it provide the imagemagick CLI, so is there some other method I could choose?
node-imagemagick actually calls the CLI tools (using child_process), hence the dependency.
As for an alternative, it really depends on what type of image manipulation you need (and also their dependencies as well, given that it has to run in a Paas platform). There's a nice list of graphics modules on the Node wiki.