potrace is a utility for converting a bitmap into a smooth,
scalable image. The input is a bitmap (PBM, PGM, PPM, or BMP).
The default output is EPS. The resulting image is not "jaggy"
like a bitmap, but smooth. potrace can currently output these
formats: EPS, PS, PDF, SVG, Xfig, gimppath, and PGM.
mkbitmap is a program distributed with potrace that can be
used to pre-process the input for better tracing behavior
on grayscale and color images.