phantomjs capture.js

capture.js

var system = require('system');
var url = system.args[1];
var page = require('webpage').create();
page.viewportSize = { width: 1024, height: 800 };
page.open(url, function(status) {
  if (status === 'success') {
    setTimeout(function() {
      page.evaluate(function() {
        document.body.style.backgroundColor = 'white';
      });
      page.render('screen.png');
      phantom.exit();    
    }, 1000);
  } else {
    phantom.exit();    
  }
});