MoneyForNothing3
One of the reasons I like the sobel filter for edge detection is that it makes it really easy to find the gradient of the edge-- that is, which direction the edge is pointing. This composition was originally just a debugging tool to make sure the sobel was accurately differentiating the edges. But it looked kind of neat on its own-- kind of like the glowing lines in the old "Money For Nothing" video by Dire Straits, so I put it up on the site.