PBMPLUS is a widely spread toolkit for converting a huge
number of image formats to and from portable formats, and
therefore to and from each other. A DOS port of PBMPLUS it to
be found on garbo.uwasa.fi and oak.oakland.edu (pbmpl91d).

NETPBM is based on the Pbmplus package. (I do not know whether
it has been ported to DOS.)

PBMPLUS is awkward to use in an MSDOS environment. The same
probably applies to NETPBM. PBMBAT is a shell program which
makes it very easy to use these invaluable programs.
