Using PIL to fill empty image space with nearby colors (aka inpainting)

Question

I create an image with PIL:

I need to fill in the empty space (depicted as black). I coul

Answer 1

A method with nice results is the Navier-Stokes Image Restoration. I know OpenCV has it, don't know about PIL.

Your example:

I did it with Mathematica.

Edit

As per your reuquest, the code is:

i = Import["http://i.stack.imgur.com/uEPqc.png"];
Inpaint[i, ColorNegate@Binarize@i, Method -> "NavierStokes"]

The ColorNegate@ ... part creates the replacement mask. The filling is done with just the Inpaint[] command.