A Graphics Conversion Packagehttp://netpbm.sourceforge.net/
These are the Portable Bitmap Plus Utilities.
This package provides tools for graphics conversion. Using these tools, images can be converted from virtually any format into any other format. A few of the supported formats include: GIF, PC-Paintbrush, IFF ILBM, Gould Scanner file, MTV ray tracer, Atari Degas .pi1 and .pi3, Macintosh PICT, HP Paintjet file, QRT raytracer, AUTOCAD slide, Atari Spectrum (compressed and uncompressed), Andrew Toolkit raster object, and many more. On top of that, man pages are included for all tools.