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## Copyright (C) 1996 John W. Eaton
##
## This file is part of Octave.
##
## Octave is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2, or (at your option)
## any later version.
##
## Octave is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Octave; see the file COPYING. If not, write to the Free
## Software Foundation, 59 Temple Place - Suite 330, Boston, MA
## 02111-1307, USA.
## Convert and RGB image to an octave indexed image.
##
## [X, map] = rgb2ind (R, G, B)
##
## SEE ALSO: ind2rgb, rgb2ntsc.
##
## Bugs: The color map may have duplicate entries.
## Author: Tony Richardson <amr@mpl.ucsd.edu>
## Created: July 1994
## Adapted-By: jwe
function [X, map] = rgb2ind (R, G, B)
if (nargin != 3)
usage ("[X, map] = rgb2ind (R, G, B)");
endif
if (size (R) != size (G) || size (R) != size (B))
error ("rgb2ind: arguments must all have the same size");
endif
[hi, wi] = size (R);
X = zeros (hi, wi);
map = zeros (hi*wi, 3);
pref = do_fortran_indexing;
unwind_protect
do_fortran_indexing = 1;
map(:,1) = R(:);
map(:,2) = G(:);
map(:,3) = B(:);
X(:) = 1:(hi*wi);
unwind_protect_cleanup
do_fortran_indexing = pref;
end_unwind_protect
endfunction
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