ASCII Portable Bit Map (PBM) Files
Read and Write Utilities

PBMA_IO is a FORTRAN77 library which reads and writes files in the ASCII Portable Bit Map (PBM) format for 2D black/white graphics information.

There are many graphics programs, such as XV and GIMP, that can display images in this format, or translate them to other formats such as BMP, GIF, JPEG, MacPaint, X Window, and so on.


The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.


PBMA_IO is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

PBMA, a data file directory which contains some example ASCII PBM files.

PGMA_IO, a FORTRAN77 library which handles the ASCII Portable Gray Map format.

PPMA_IO, a FORTRAN90 library which handles the ASCII Portable Pixel Map format.


  1. the NETPBM homepage.

Source Code:

Examples and Tests:

List of Routines:

You can go up one level to the FORTRAN77 source codes.

Last revised on 04 June 2010.