Potrace is a utility for tracing a bitmap, which means, transforming a
bitmap into a smooth, scalable image. The input is a bitmap (PBM, PGM,
PPM, or BMP), and the default output is one of several vector file
formats. A typical use is to create EPS files from scanned data, such
as company or university logos, handwritten notes, etc. The resulting
image is not "jaggy" like a bitmap, but smooth. It can then be rendered
at any resolution.