Manual: ppmtogif

Ppmtogif User Manual(1)				   General Commands Manual			     Ppmtogif User Manual(1)

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 ppm‐
       togif, 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

netpbm documentation										     Ppmtogif User Manual(1)