ppmquant - quantize the colors in a PPM image down to a specified number
ppmquant [
-floyd|
-fs]
ncolors [
ppmfile]
ppmquant [
-floyd|
-fs] [
-nofloyd|
-nofs]
-mapfile mapfile [
ppmfile]
All options can be abbreviated to their shortest unique prefix. You may use two
hyphens instead of one to designate an option. You may use either white space
or equals signs between an option name and its value.
This program is part of
Netpbm(1).
ppmquant is obsolete. All it does now is invoke
pnmquant or
pnmremap. You should use one of those programs in any new program, or
if you are modifying an old program, and your program does not have to work
with a version of Netpbm before 9.21 (January 2001).
ppmquant exists
only for name compatibility.
pnmquant is fully backward compatible with
ppmquant without
the
-mapfile option;
pnmremap is fully backward compatible with
ppmquant with the
-mapfile option.
Except with differences suggested by the syntax synopsis above,
ppmquant's function is the same as
pnmquant and
pnmremap.
Before Netpbm 10.19 (November 2003),
ppmquant was a completely separate
program from
pnmquant, and was a bona fide PPM program. That means if
you gave it a PGM or PBM image as input, it would process it as if it were PPM
and generate a PPM output. Now, since it is really a PNM program, it processes
PBM and PGM inputs as what they are and produces the same kind of output.
Note: The reason
ppmquant was changed in Netpbm 10.19 is that for some
time before that,
ppmquant had a serious bug that would have been
difficult to fix -- it chose the wrong color set. Maintaining two versions of
the same code did not make sense.
pnmquant(1),
pnmremap(1),
pnmcolormap(1),
pamseq(1),
ppm(1)
Copyright (C) 1989, 1991 by Jef Poskanzer.
This manual page was generated by the Netpbm tool 'makeman' from HTML source.
The master documentation is at
- http://netpbm.sourceforge.net/doc/ppmquant.html