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.