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ind2rgb.m
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1996-09-28
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# Copyright (C) 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA.
function [R, G, B] = ind2rgb (X, map)
# Convert an indexed image to red, green, and blue color components.
#
# [R G B] = ind2rgb(X) uses the current colormap for the conversion.
#
# [R G B] = ind2rgb(X,map) uses the specified colormap.
#
# SEE ALSO: rgb2ind, image, imshow, ind2gray, gray2ind.
# Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.
if (nargin < 1 || nargin > 2)
usage ("ind2rgb (X, map)");
elseif (nargin == 1)
map = colormap ();
endif
[hi, wi] = size (X);
# XXX FIXME XXX -- we should check size of X and map.
pref = do_fortran_indexing;
unwind_protect
do_fortran_indexing = "true";
R = map (X(:), 1);
G = map (X(:), 2);
B = map (X(:), 3);
R = reshape (R, hi, wi);
G = reshape (G, hi, wi);
B = reshape (B, hi, wi);
unwind_protect_cleanup
do_fortran_indexing = pref;
end_unwind_protect
endfunction