Well I've learned that there is a much easier way to do this. Use a program called html2jpg blackbox. It's a command line app that generates thumbs from URLs.. It will even generate a thumb 100px X 500px long with the full content of the website. (If you tell it to.) Good stuff, worth the price if you're serious.
Check it out here: http://www.html2jpg.com/bb_description.htm