PBMA_IO is a C library which reads and writes files in the ASCII PBM format for 2D bit map 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.
PBMA, a data directory which contains some example ASCII PBM files.
PBMB_IO, a C library which handles the binary PBM (Portable Bit Map) format.
PGMA_IO, a C library which handles the ASCII PGM (Portable Gray Map) format.
PPMA_IO, a C library which can read or write ASCII PPM (Portable Pixel Map) graphics files.
You can go up one level to the C source codes.