Who is the artist?

Is Thomas Jourdan the artist? He wrote Kandid, the open-source genetic art program that I used to generate this image. He’s never even seen the image. On the other hand, many people have contributed to the math behind fractals, genetic algorithms and evolutionary art. Do they deserve some credit?
Is Kandid, the program, the artist? Or is a program just a tool, much like Leonardo’s paintbrush was a tool?
Am I, the user, the artist? All I did was click a few buttons and see what happened.
Am I, the editor, the artist? I generated a few dozen images and picked out the one I liked best. That act of selection seems something like art, the same way I take a hundred pictures with my digital camera and delete 99 of them. However, if we call that art, we have to call what art critics do art as well.