node-imagemagic-wrapper do process different image styles

imageProcessor.js

var _ = require('underscore'),
  inherits = require('util').inherits,
	EventEmitter = require('events').EventEmitter, 
	imagemagick = require('imagemagick');


function ImageProcessor(options){
	if(!options.image){
		throw new Error("Provide an image to convert");
	}

	this.image = options.image;

	if(options.styles){
		this.styles = options.styles;
	}

	EventEmitter.call(this);

	if(!options.process){
		this.process();
	}
};
inherits(ImageProcessor, EventEmitter);


ImageProcessor.prototype.process = function(){
	var len = 0, options;

	for(var style in this.styles){
		len++;

		(function(options, style, processer){
			imagemagick.resize({
				srcPath : processer.image,
				format : options.format,
				width : options.geometry.width || 0,
				height : options.geometry.height || 0
			}, function(err, stdout, stderr){
				if(err){
					console.warn(err);
				} else {
					processer.emit('style', style, new Buffer(stdout, 'binary'));
				}
				done(processer);
			});
		})(this.styles[style], style, this);
	}

	function done(processer){
		if(--len === 0){
			processer.emit('done');
		}
	}
};


module.exports = ImageProcessor;

usage.js

var processor = new ImageProcessor({
	image : params.files.cover.path,
	styles : {
		profile : {
			geometry : { width : 600, height: 1000 },
			format : 'jpg'
		}
	}
});
//callback for each style
processor.on('style', function(style, imageBuffer){
	
});
//callback if all styles are processed
processor.on('done' function(){
	
})