Now,there is another option we can use to capture our web page.Websitescreenshots.Com offer users an option to take the screeshots of their web page using a software provide by them.
The difference between Snat.Ch and Websitescreenshots.Com is Snat.Ch only take the screenshots that appear on your browser.That means,you maybe get half picture of your web page.While using Websitescreenshots.Com,you can get the whole picture of your web page.
WebShot is a program that allows you to take screenshots and thumbnails of web pages or whole websites. It comes with a command line interface for advanced users. The following image formats are supported JPG, GIF, PNG, BMP.
For downloading this software and to get more information about it,feel free to go here.
p/s:Maybe there is some bug while you using it.