Here is detailed example on how to use html2image linux on Ubuntu 64 bit (Ubuntu 7.10 - the Gutsy Gibbon)
This serves as a good example on how to use html2image. Other 64 bit Linux distribution can be done similarly.
Here are a more complete examples of using htmlsnapshot to convert html to image with php on Windows.
Note the following things:
You may need to run a command line utility to convert html or url to image. Here is a handy script that converts url/html to image with our award winning htmlsnapshot product.
Save the below code into a script snapurl.vbs (Or you can find this script in htmlsnapshot\demo\vbscript)