Resize image with gm module

resize_image.js

var fs = require('fs'),
	gm = require('gm').subClass({imageMagick: true});;

var IMAGE_DIR = __dirname +'/images/',
	SAVE_DIR = __dirname +'/imagesResize/';

var imageList = ['1.jpg', '2.jpg', '3.jpg'];

var resize_keep_ratio = function(name) {
	console.log(IMAGE_DIR+ name);
	gm(IMAGE_DIR+ name)
		.resize(200,200,'^')
		.gravity('Center')
		.extent(200, 200)
		.write(SAVE_DIR+name, function(err) {
			if (err) console.log(err);
			console.log(SAVE_DIR+name);
		});
}

imageList.forEach(function(img) {
	resize_keep_ratio(img);
});