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 format), and the output can be EPS (default),
Postscript, SVG ou PGM (for easy antialiasing). 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.