pixsort
Applying the traveling salesman problem to pixel art.
Goal: Find the shortest path to visit all black pixels in an image.
Algorithm: Simulated annealing.
Usage
go get github.com/fogleman/pixsort
pixsort image.png
This will generate a file named image.png.gif with the result.
You can also pass in a quality parameter to make it try harder.
pixsort image.png 28
The algorithm will run 2 ^ quality iterations.