cameraman.js

var page = require('webpage').create();
var args = require('system').args;

page.viewportSize = {
    width: 1200,
    height: 780
};

page.open(args[1], function (status) {
    if (status !== 'success') {
        console.log('Unable to load the address!');
    } else {
        var clipRect = page.evaluate(function () {
          return document.querySelector('body').getBoundingClientRect();
        });
        page.clipRect = {
            top:    clipRect.top,
            left:   clipRect.left,
            width:  clipRect.width,
            height: clipRect.height
        };
        window.setTimeout(function () {
            page.render('capture.png');
            phantom.exit();
        }, 5000);
    }
});