var page = require('webpage').create(),

system = require('system'),
address, output, size;

if (system.args.length < 3 || system.args.length > 5) {

console.log('Usage: rasterize.js URL filename [paperwidth*paperheight|paperformat] [zoom]');
console.log('  paper (pdf output) examples: "5in*7.5in", "10cm*20cm", "A4", "Letter"');
phantom.exit(1);

} else {

address = system.args[1];
output = system.args[2];
page.viewportSize = { width: 600, height: 600 };
if (system.args.length > 3 && system.args[2].substr(-4) === ".pdf") {
    size = system.args[3].split('*');
    page.paperSize = size.length === 2 ? { width: size[0], height: size[1], margin: '0px' }
        : { format: system.args[3], orientation: 'portrait', margin: '1cm' };
}
if (system.args.length > 4) {
    page.zoomFactor = system.args[4];
}
page.open(address, function (status) {
    if (status !== 'success') {
        console.log('Unable to load the address!');
        phantom.exit();
    } else {
        window.setTimeout(function () {
            page.render(output);
            phantom.exit();
        }, 200);
    }
});

}