Instead of smoothing the image, we instead use a filter which highlights edges, called a Sobel filter.
I love this image that that results from applying the Sobel filter to a Julia set. I love how it is delicate, detailed and yet has it's own inherent coherent structure. Click on it to show a fuller image.
Amazing that this essentially comes from a very simple iterated function z2+c. And it's generated by the simple code we develop in the book.
I love it so much it's going to be the cover of the book!
