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Pnmtopnm User Manual(0) 						  Pnmtopnm User Manual(0)

NAME
       pnmtopnm - copy a PNM image

SYNOPSIS
       pnmtopnm

       [pnmfile]

DESCRIPTION
       This program is part of Netpbm(1)

       pnmtopnm  simply copies a PNM image to Standard Output.	The output has the same major PNM
       format (PBM, PGM, or PPM) and maxval as the input.  This may seem an unnecessary  duplica-
       tion of cat, but it lets you convert between the plain (ASCII) and raw (binary) subformats
       of PNM.	Use the -plain Netpbm common option to ensure the output is plain PNM, and  don't
       use -plain to ensure the output is raw PNM.  See
	Common Options <index.html#commonoptions> .

       You  don't  normally  need to convert between the PNM subformats, because any program that
       uses the Netpbm library to read a PNM image will read all of them directly.  But there are
       a  lot  of  programs that don't use the Netpbm library and understand only the raw format.
       Plain format is nice because it is human readable; people often use it to  debug  programs
       that process PNM images.

       pnmtopnm  is  really  just another name for the program pamtopnm.  The latter does the job
       because like any Netpbm program that takes PAM input via the  Netpbm  programming  library
       facilities, it also takes PNM input.

HISTORY
       pnmtopnm  was new in Netpbm 10.23 (July 2004).  It obsoleted pnmtoplainpnm, which specifi-
       cally did the conversion to plain PNM.  There was no program to explicitly convert to  raw
       PNM,  but many Netpbm programs can be made, with the right options, to be idempotent (i.e.
       to do the same thing as pnmtopnm).

       Then David Jones realized that the existing pamtopnm already did everything that  pnmtopnm
       did  and  more,	so in Netpbm 10.27 (March 2005), pnmtopnm became simply an alternate name
       for pamtopnm.

SEE ALSO
       ppmtoppm(1)

       pgmtopgm(1)

       pamtopnm(1)

       pnm(1)

netpbm documentation			  24 March 2005 		  Pnmtopnm User Manual(0)
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