phantom screenshot

gistfile1.js

var page = require('webpage').create();
var system = require('system');
var address, output, size;

if (system.args.length < 3 || system.args.length > 5) {
    process.exit(1);
} else {
    address = system.args[1];
    output = system.args[2];
    page.viewportSize = { width: 800, height: 500 };

    page.open(address, function(status) {
        if (status !== 'success') {
            console.log('cannot load the webpage!');
            phantom.exit();
        } else {
            var rect = page.evaluate(function() {
                return document.querySelector('.panel-container').getBoundingClientRect();
            });
            page.clipRect = {top: rect.top, left: rect.left, width: rect.width, height: rect.height};
            window.setTimeout(function() {
                page.render(output);
                phantom.exit();
            }, 2000);
        }
    });
}