.\" This man page was generated by the Netpbm tool 'makeman' from HTML source. Ppmtogif User Manual - Online Linux Manual PageSection : 0
Updated :
Source : netpbm documentation
NAMEppmtogif - replaced by pamtogif This program is part of Netpbm(1)​.
SYNOPSISppmtogif was replaced in Netpbm 10.37 (December 2006) by "pamtogif(1)​. pamtogif is mostly backward compatible with ppmtogif.
DESCRIPTIONOne 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 PpmtogifIf 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 SOURCEThis manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at http://netpbm.sourceforge.net/doc/ppmtogif.html 0
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