node_correct.js

#!/usr/bin/env node
var fs = require('fs');
var gm = require('gm');
var argv = require('optimist')
	.demand(1)
	.demand('l')
	.alias('l', 'label')
	.describe('l', 'Specify a label')
	.argv;

var file = argv._[0];
var label = argv['label'];
var stream = fs.createReadStream(file);
var magic = gm(stream);

magic.drawText(40, 30, label).write('./defaults.png', function (err) {
	if (!err) console.log('Done!');
});