$ apt-get install imagemagick

$ brew install imagemagick

$ yum install imagemagick

$ npm install easyimage

var easyimg = require('easyimage');

easyimg.info(<image_path>, <callback_function>) - to retrieve information about an image (name, type, width, height, size, depth)
easyimg.convert(<options>, <callback_function>) - to convert an image from one format to another
easyimg.resize(<options>, <callback_function>) - to resize an image
easyimg.crop(<options>, <callback_function>) - to crop an image
easyimg.thumbnail(<options>, <callback_function>) - to create square thumbnails
easyimg.rescrop(<options>, <callback_function>) - to resize and crop and image in one go, useful for creating customzied thumbnails
easyimg.exec(<command>, <callback_function>) - when you want to call a custom command to ImageMagick, you will need to take care of escaping special characters etc

src - path to source image
dst - path to destination image
width - width of resized image
height - height of resized image
cropwidth - width of cropped image, if missing, width will be used instead
cropheight - height of cropped image, if missing, height will be used instead
x - x offset for cropping, defaults to 0
y - y offset for cropping, defaults to 0
quality - quality of processed image, 1 to 100
gravity - crop position [NorthWest | North | NorthEast | West | Center | East | SouthWest | South | SouthEast], defaults to Center
fill - fill area flag, image is resized to completely fill the target crop dimensions, defaults to false

easyimg.info('kitten.jpg', function(err, stdout, stderr) {
  if (err) throw err;
  console.log(stdout);
});

easyimg.rescrop(
  {
     src:'kitten.jpg', dst:'kitten-thumbnail.jpg',
     width:500, height:500,
     cropwidth:128, cropheight:128,
     x:0, y:0
     },
  function(err, image) {
     if (err) throw err;
     console.log('Resized and cropped: ' + image.width + ' x ' + image.height);
  }
);