CutyCapt

Found here: http://xmodulo.com/2014/02/convert-html-web-page-png-image-linux.html

Homepage: http://cutycapt.sourceforge.net/

Install on Debian, Ubuntu or Linux Mint:

$ sudo apt-get install cutycapt

Convert HTML to PNG with CutyCapt

$ cutycapt --url=http://www.bigjigstoys.com --out=/home/user/Pictures/cnn.png