When we add an image to a post, the resulting markdown is:
![enter image description here] : http://i.stack.imgur.com/6ySkR.png
And in order to add a tooltip, you'll need to do this:
: http://i.stack.imgur.com/6ySkR.png "tooltip"
Very easy to do, but I most images I see on Programmers have neither a description nor a tooltip, I guess people don't care much to add any more information after the image is uploaded. I think it would be far more easier if the image dialog had an extra field for description:
And the resulting markdown would be:
![Venn diagram from FAQ] : http://i.stack.imgur.com/ociNc.png