pnm(5) [suse man page]

The PNM Format(5)						File Formats Manual						 The PNM Format(5)

NAME

       pnm - Netpbm superformat

DESCRIPTION

       The PNM format is just an abstraction of the PBM, PGM, and PPM formats.	I.e. the name 'PNM' refers collectively to PBM, PGM, and PPM.

       The  name  'PNM'  is  an acronym derived from 'Portable Any Map.' This derivation makes more sense if you consider it in the context of the
       other Netpbm format names: PBM, PGM, and PPM.

       The more general term 'Netpbm format' refers to the PNM formats plus PAM.

       PNM is principally used with Netpbm(1)

       Note that besides being names of formats, PBM, PGM, PPM, and PNM are also classes of programs.  A PNM program can take  PBM,  PGM,  or  PPM
       input.	That's	nothing  special -- a PPM program can too.  But a PNM program can often produce multiple output formats as well, and a PNM
       program can see the difference between PBM, PGM, and PPM input and respond to each differently whereas a PPM program sees everything as	if
       it were PPM.  This is discussed more in the description of the netpbm programs (1)

       'pnm' also appears in the names of the most general Netpbmlibraryroutines(3) , some of which aren't even related to the PNM format.

SEE ALSO

       ppm(5) , pgm(5) , pbm(5) , pam(5) , programsthatprocessPNM(1) , libnetpbm(3)

netpbm documentation						  03 October 2003						 The PNM Format(5)

pamtopnm(1)						      General Commands Manual						       pamtopnm(1)

NAME

       pamtopnm - convert PAM image to PBM, PGM, or PPM

SYNOPSIS

       pamtopnm [-assume] [pnmfile]

       All options may be abbreviated to the shortest unique prefix.

DESCRIPTION

       Reads a PAM image as input.  Produces an equivalent PBM, PGM, or PPM (i.e. PNM) image, whichever is most appropriate, as output.

       pamtopnm  assumes  the  PAM  image  represents  the information required for a PBM, PGM, or PPM image if its tuple type is "BLACKANDWHITE",
       "GRAYSCALE", or "RGB" and its depth and maxval are appropriate.	If this is not the case, pamtopnm fails.

       However, you can override the tuple type requirement with the -assume option.

       As with any Netpbm program that reads PAM images, pamtopnm also reads PNM images as if they were PAM.  In that case,  pamtopnm's  functions
       reduces	to  simply copying the input to the output.  But this can be useful in a program that doesn't know whether its input is PAM or PNM
       but needs to feed it to a program that only recognizes PNM.

OPTIONS

       -assume
	      When you specify -assume, you tell pamtopnm that you personally vouch for the fact that the tuples contain the same data as  belongs
	      in  the  channels of a PBM, PGM, or PPM file.  The depth must still conform, though, so to truly force a conversion, you may have to
	      run the input through pamchannel first.  But be careful with -assume.  When you -assume, you make an -ass of u and me.

SEE ALSO

       pbmtopgm(1), pgmtopbm(1), pgmtoppm(1), ppmtopgm(1), pam(5), pnm(5), pbm(5), pgm(5), ppm(5)

								  03 August 2000						       pamtopnm(1)