pbma_io, a FORTRAN90 code 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 MIT license
pbma_io is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.
PGMA_IO, a FORTRAN90 code which handles the ASCII Portable Gray Map format.
PPMA_IO, a FORTRAN90 code which handles the ASCII Portable Pixel Map format.