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 dou-
       ble 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

       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)

netpbm documentation            03 August 2000         Pamtopnm User Manual(0)

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