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 default output is an encapsulated PostScript file (EPS). 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.
Potrace can currently produce the following output formats: EPS, PostScript, PDF, SVG (scalable vector graphics), Xfig, Gimppath, and PGM (for easy antialiasing). Additional backends might be added in the future.

Mkbitmap is a program distributed with Potrace which can be used to pre-process the input for better tracing behavior on greyscale and color images.

Usage: potrace [options] [filename...]
General options:
-h, --help - print this help message and exit
-v, --version - print version info and exit
-l, --license - print license info and exit
File selection:
<filename> - an input file
-o, --output <filename> - write all output to this file
-- - end of options; 0 or more input filenames follow

The license of this software is Free, you can free download and free use this image processing software.