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From the blog - "I needed a website capture utility, that will dump output into a png file. I couldn't find any one-stop-shop for getting it done. There are many websites that have this service (see references towards the end in the post), however I needed something where I have access to the source code, so that I could tweak it to my needs Also something in Ruby was preferable, so that I can integrate it with other stuff I am working on."