potrace

Transforms bitmaps into vector graphics

potrace is a Peter Selinger's GPLed utility for tracing bitmaps - converting them into smooth, scalable images. It accepts as input a bitmap B/W images (PBM, PGM, PPM and BMP formats), and returns encapsulated PostScript (EPS) as the default output. Other output format are available: PS, SVG, Xfig, PGM, PDF and experimental GimpPath. You can create scalable images from scans, such as logos, hand taken notes, etc. The resulting smooth images can then be rendered at any resolution.