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

       pnmtopnm - copy a PNM image



       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 duplication 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 .

       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.

       pnmtopnm was new in Netpbm 10.23 (July 2004).  It obsoleted pnmtoplainpnm, which specifically did  the  conver-
       sion  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.

       ppmtoppm(1) pgmtopgm(1) pamtopnm(1) pnm(1)

netpbm documentation             24 March 2005         Pnmtopnm User Manual(0)