Using Markdown, how do I center an image and its caption?

Question

I want to end up with:

Hello there!

      
      This is an image

Hi!

Where the image and the text This is an image

Answer 1

If you are using kramdown, you can do this

Hello there!

{:.center}
![cardinal](/img/2012/cardinal.jpg)  
This is an image

Hi!

.center {
  text-align: center;
}