The PBM Format(5) File Formats Manual The PBM Format(5) (NAME) pbm - Netpbm (DESCRIPTION) Netpbm(1) . PBM ( ) . . . "PBM" "Portable Bit Map" ( ) . -- . . (pipe) . (THE LAYOUT) . PBM PBM . . PBM : o " " (magic number) . pbm "P4" . o ( ). o ASCII. o . o ASCII. o ( ). o () . (don't care) . : . . . . . . . o "#" ( ) () . ( Netpbm ). ASCII . "newline" ASCII Line Feed LF . " " space CR LF TAB VT FF ( isspace() C ). (Minimal Subset) PBM libnetpbm . . : o 'P4' o ( '50 100') o (raster) . pnmtopnm PBM pnmtopnm . PBM (Plain PBM) PBM PBM Plain PBM . Plain PBM PBM . Plain PBM -- -- . ( PBM ) . . . Netpbm Raw PBM Plain PBM -plain Plain PBM . : o . o " " "P4" "P1" . o '1' '0' . . o . o . o . PBM : P1 # feep.pbm 24 7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 1 0 0 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 0 0 0 1 1 1 1 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 1 1 1 0 0 1 1 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 . Plain PBM PBM ( ) pnmtoplainpnm . . (INTERNET MEDIA TYPE) (MIME type ) PBM IANA image/x- portable-bitmap . PNM image/x-portable-anymap . (FILE NAME) PBM ".pbm" . "pnm" PNM . (COMPATIBILITY) PBM . PBM . (SEE ALSO) libnetpbm(1), pnm(1), pgm(1), ppm(1), pam(1), programs that process PBM(1) (DOCUMENT SOURCE) 'makeman' Netpbm HTML . : http://netpbm.sourceforge.net/doc/pbm.html netpbm documentation 07 November 2025 The PBM Format(5)