Get image dimensions from url path

I am trying to load the dimensions of an image from url. So far I've tried using `GraphicsMagick` but it gives me `ENOENT` error. Here's the code so far I've written. ``` var gm = require('gm'); ... gm(img.attribs.src).size(function (err, size) { if (!err) { if( size.width>200 && size.height>200) { console.log('Save this image'); } } }); ``` Where `img.attribs.src` contains the `url source path` of the image. Update value of `img.attribs.src` http://rack.1.mshcdn.com/assets/header_logo.v2-30574d105ad07318345ec8f1a85a3efa.png