PBM (Portable bitmap)

PBMPlus is an intermediate format for graphics used by the famous(?) Portable Bit Map toolkit suite of C programs for Unix machines, created by Jef Poskanzer. It is an extremely simple format, with no support for compression.

The PBM formats (pbm for bilevel, pgm for greyscale and ppm for colour images) serve as an intermediate between a very large range of other graphic formats. The PBMPlus package includes utilities for manipulating the PBM formats in several ways (scaling, colour quantization, etc.).

is a Portable Bit Map, and comprises only of 'bits', ie 0's and 1's. It deals only with monochrome images, black and white.