1Pnmtopnm User Manual(0) Pnmtopnm User Manual(0)
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6 pnmtopnm - copy a PNM image
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9 pnmtopnm
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11 [pnmfile]
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15 This program is part of Netpbm(1).
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17 pnmtopnm simply copies a PNM image to Standard Output. The output has
18 the same major PNM format (PBM, PGM, or PPM) and maxval as the input.
19 This may seem an unnecessary duplication of cat, but it lets you con‐
20 vert between the plain (ASCII) and raw (binary) subformats of PNM. Use
21 the -plain Netpbm common option to ensure the output is plain PNM, and
22 don't use -plain to ensure the output is raw PNM. See
23 Common Options ⟨index.html#commonoptions⟩ .
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25 You don't normally need to convert between the PNM subformats, because
26 any program that uses the Netpbm library to read a PNM image will read
27 all of them directly. But there are a lot of programs that don't use
28 the Netpbm library and understand only the raw format. Plain format is
29 nice because it is human readable; people often use it to debug pro‐
30 grams that process PNM images.
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32 pnmtopnm is really just another name for the program pamtopnm. The
33 latter does the job because like any Netpbm program that takes PAM
34 input via the Netpbm programming library facilities, it also takes PNM
35 input.
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39 There are no command line options defined specifically for pnmtopnm,
40 but it recognizes the options common to all programs based on libnetpbm
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42 Common Options ⟨index.html#commonoptions⟩ .)
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46 pnmtopnm was new in Netpbm 10.23 (July 2004). It obsoleted pnmto‐
47 plainpnm, which specifically did the conversion to plain PNM. There
48 was no program to explicitly convert to raw PNM, but many Netpbm pro‐
49 grams can be made, with the right options, to be idempotent (i.e. to do
50 the same thing as pnmtopnm).
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52 Then David Jones realized that the existing pamtopnm already did every‐
53 thing that pnmtopnm did and more, so in Netpbm 10.27 (March 2005), pnm‐
54 topnm became simply an alternate name for pamtopnm.
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58 ppmtoppm(1) pgmtopgm(1) pamtopnm(1) pnm(1)
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61 This manual page was generated by the Netpbm tool 'makeman' from HTML
62 source. The master documentation is at
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64 http://netpbm.sourceforge.net/doc/pnmtopnm.html
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66netpbm documentation 24 March 2005 Pnmtopnm User Manual(0)