ImageMagick is a excellent graphic processing tool.
It contains many features.
It can do the resize in batch images that is one of these features.
Let me show you how to do it.
Khtml2png is a helpful tool for capturing an image of a webpage with ease. It's nice to use because it will get the entire length of the site, no matter whether it is fully visible in the browser. And, it sure beats shell scripting Firefox to open on a different display and capturing an image with Imagemagick