export nvd3 graph to png

Searching on this, I've come across a lot of people asking the same things and all kinds of possible solutions. However, there are so many that it is not clear if there actually is a 'standard' or method for doing this as of today.

In my case, there are four graphs in one page. I would like the user to be able to click on an option beside each graph in order to convert this into an image.

The main goal would be to post that image in a blog on another site, meaning, not so much simply to display the graph as an image in the browser.
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You can convert html canvas to PNG
projectsAuthor Commented:
Yes, I know, there are tons of examples on the net showing how to save to images but I'm asking about being able to push the graph as an image to a blog for example, not just save it or view it as an image.
It draws SVG on canvas with javascript. So pick canvas, convert to PNG and throw at user (or post to server).

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projectsAuthor Commented:
Again, thank you, I know about this, I've read about it. What I'm asking is for information/leads to the most current method on how this is done. Perhaps a site which shows examples, some code, etc but which is known to be the most current method as of today.
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