> PBMPLUS, UTILITIES, Portable Bit Map Toolkit (10dec91 version)  E PBMPLUS is a toolkit for converting various image formats to and from E portable formats, and therefore to and from each other.  The idea is, ? if you want to convert among N image formats, you only need 2*N G conversion filters, instead of the N^2 you would need if you wrote each  one separately.   E In addition to the converters, the package includes some simple tools & for manipulating the portable formats.