node-imagemagick

I am using GraphicsMagick for node. I basically crop the photos and retrieve the exif data of the photos uploaded by the user. I don't want to block the flow of request waiting for these task to be completed, therefore I need to use asynchronous functions to be able to do so. And I think I should be able to as these are I/O operations which node.js makes async itself. But as I see all the functions in GraphicsMagick for node are synchronous functions. So I am not being able to sure as to how to achieve what I am looking for. One idea that comes to my mind is to write a function with callback

I am trying to resize an image with node-imagemagick library, but it is not working. the code i am using to resize is im.resize({ srcPath: __dirname+'originalimage.jpg', dstPath: __dirname+'resized.jpg', width: 50 }, function(err, stdout, stderr){ if (err) throw err; }); It throws the error Error: Command failed: Invalid Parameter - -set at ChildProcess.<anonymous> (E:\NodeJsDevelopment\node_modules\imagemagick\imagemagick.js:64:15) at ChildProcess.EventEmitter.emit (events.js:91:17) at Process._handle.onexit (child_process.js:674:10) On windows you also need to install the imagemagick exe.