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annotate scripts/image/rgb2ind.m @ 1024:56520a75b5b3

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[project @ 1995-01-11 20:30:04 by jwe]
author jwe
date Wed, 11 Jan 1995 20:30:04 +0000
parents b843a65fa977
children 611d403c7f3d
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1 # Copyright (C) 1995 John W. Eaton
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2 #
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3 # This file is part of Octave.
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4 #
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5 # Octave is free software; you can redistribute it and/or modify it
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6 # under the terms of the GNU General Public License as published by the
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7 # Free Software Foundation; either version 2, or (at your option) any
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8 # later version.
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9 #
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10 # Octave is distributed in the hope that it will be useful, but WITHOUT
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11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 # for more details.
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14 #
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15 # You should have received a copy of the GNU General Public License
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16 # along with Octave; see the file COPYING. If not, write to the Free
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17 # Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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18
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19 function [X, map] = rgb2ind (R, G, B)
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20
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21 # Convert and RGB image to an octave indexed image.
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22 #
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23 # [X, map] = rgb2ind (R, G, B)
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24 #
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25 # SEE ALSO: ind2rgb, rgb2ntsc.
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26 #
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27 # Bugs: The color map may have duplicate entries.
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28
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29 # Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.
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30
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31 if (nargin != 3)
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32 usage ("[X, map] = rgb2ind (R, G, B)");
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33 endif
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34
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35 if (size (R) != size (G) || size (R) != size (B))
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36 error ("rgb2ind: arguments must all have the same size");
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37 endif
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38
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39 [hi, wi] = size (R);
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40
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41 X = zeros (hi, wi);
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42
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43 map = zeros (hi*wi, 3);
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44
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45 pref = do_fortran_indexing;
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46
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47 unwind_protect
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48
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49 do_fortran_indexing = "true";
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51 map(:,1) = R(:);
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52 map(:,2) = G(:);
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53 map(:,3) = B(:);
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55 X(:) = 1:(hi*wi);
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57 unwind_protect_cleanup
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58 do_fortran_indexing = pref;
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59 end_unwind_protect
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61 endfunction