Looking to say "http://example.com/index.html -o website.png"
Is there an existing program to do this? I'm ok with doing html to png. Is there a program for that?
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TL;DR; Try wkhtmltopdf.org
Original Answer: (2011 -- before question tags added)
Check the answer to this question. It seems the same as yours: https://stackoverflow.com/questions/125951/command-line-program-to-create-website-screenshots-on-linux
If it's on Windows, check also:
A few other console / terminal based tools that can convert HTML to images.
They are both cross OS, free, and very popular.
While it is no direct solution, the browsershots project is open source and basically provides what is requested here.