CentOS 7.0 - man page for pamtopnm (centos section 0)

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Pamtopnm User Manual(0) 						  Pamtopnm User Manual(0)

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




       Minimum	unique	abbreviation of option is acceptable.  You may use double hyphens instead
       of single hyphen to denote options.  You may use white space in place of the  equals  sign
       to separate an option name from its value.

       This program is part of Netpbm(1)

       pamtopnm reads a PAM image as input and 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.

       pamtopnm produces a PPM image if the input PAM has depth 3 or 4; it produces PGM or PBM if
       the  input  PAM has depth 1 or 2.  Whether it produced PGM or PBM depends upon the maxval:
       PBM for 1, PGM for anything higher.  The tuple type does not play a  role  in  determining
       the output type.  You can use Netpbm programs such as pgmtopgm to generate a different PNM
       output, but remember that Netpbm program that expects PGM input will take PBM and so on.

       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.

	      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.

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

       pamtopnm was new, along with the PAM format, in Netpbm 9.7 (August 2000).

netpbm documentation			   10 May 2010			  Pamtopnm User Manual(0)

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