Portable anymap file format
The pnm programs operate on portable bitmaps, graymaps, and pixmaps, produced by the pbm, pgm, and ppm segments. There is no file format associated with pnm itself.
anytopnm(1), rasttopnm(1), tifftopnm(1), xwdtopnm(1), pnmtops(1), pnmtorast(1), pnmtotiff(1), pnmtoxwd(1), pnmarith(1), pnmcat(1), pnmconvol(1), pnmcrop(1), pnmcut(1), pnmdepth(1), pnmenlarge(1), pnmfile(1), pnmflip(1), pnmgamma(1), pnmindex(1), pnminvert(1), pnmmargin(1), pnmnoraw(1), pnmpaste(1), pnmrotate(1), pnmscale(1), pnmshear(1), pnmsmooth(1), pnmtile(1), ppm(5), pgm(5), pbm(5)
Copyright (C) 1989, 1991 by Jef Poskanzer.