NAME

       ppmtogif - replaced by pamtogif

DESCRIPTION

       This program is part of Netpbm(1).

       ppmtogif was replaced in Netpbm 10.37 (December 2006) by pamtogif(1).

       pamtogif is mostly backward compatible with ppmtogif.

       One  way pamtogif is not backward compatible with ppmtogif is that to specify a transparency (alpha) mask
       with ppmtogif, you supply the transparency as a separate pseudo-PGM image  and  use  the  -alpha  option,
       whereas  with pamtogif, you supply an input image that has the transparency integrated into it, and there
       is no -alpha option.

       ppmtogif still exists as a separate program for backward compatibility, but it runs pamtogif  to  do  the
       essential work.  The compatibility ppmtogif interprets an -alpha option by reading the transparency image
       and combining it with the input image, then feeding pamtogif the combined image it expects.   Other  than
       that, the compatibility ppmtogif just passes input and options directly to pamtogif.

       You  should  not  make  any  new use of ppmtogif and if you modify an existing use, you should upgrade to
       pamtogif.  But note that if you write a program that might have to be used with old Netpbm,  ppmtogif  is
       the only way to do that.

       Unless you use the -alpha option, you can simply change the name of the program.  If you use -alpha, here
       is how to upgrade:

         $ ppmtogif -alpha=myalpha.pgm myinput.ppm >myoutput.gif

       becomes

         $ pamstack -tupletype=RGB_ALPHA myinput.ppm myalpha.pgm |  \
             pamtogif >myoutput.gif

Original Ppmtogif

       If you are using Netpbm before 10.37, pamtogif doesn't exist, so you  use  ppmtogif.   You  can  use  the
       pamtogif manual for ppmtogif, with the following exceptions.

       The  current  documentation  of pamtogif documents all versions of that program.  Use the information for
       Version 10.37 only.

       ppmtogif before Netpbm 10.31 does not accept PAM input at all.

       ppmtogif does not accept PAM input with transparency information in it.  Instead, ppmtogif has an  -alpha
       option.

       The  syntax of the option is -alpha=pgmfile.  ppmtogif treats the contents of the named PGM file the same
       as pamtogif treats the alpha plane of a PAM.  The PGM image must have the same dimensions  as  the  input
       file.   But  unlike  the  PAM case, the alpha image need not have the same maxval as the input.  ppmtogif
       interprets the alpha file using the alpha file's maxval.

       You cannot specify both -transparent and -alpha.

DOCUMENT SOURCE

       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The  master  documentation
       is at

              http://netpbm.sourceforge.net/doc/ppmtogif.html