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1 ## Copyright (C) 1996, 1997 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 |
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7 ## the Free Software Foundation; either version 2, or (at your option) |
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8 ## any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License 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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{rgb}) |
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22 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{r}, @var{g}, @var{b}) |
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23 ## Convert and RGB image to an Octave indexed image. |
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24 ## @seealso{ind2rgb, rgb2ntsc} |
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25 ## @end deftypefn |
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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 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
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30 ## Created: July 1994 |
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31 ## Adapted-By: jwe |
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32 |
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33 function [X, map] = rgb2ind (R, G, B) |
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34 |
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35 if (nargin != 1 && nargin != 3) |
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36 print_usage (); |
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37 endif |
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38 |
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39 if (nargin == 1) |
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40 rgb = R; |
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41 if (length (size (rgb)) == 3 && size (rgb, 3) == 3) |
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42 R = rgb(:,:,1); |
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43 G = rgb(:,:,2); |
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44 B = rgb(:,:,3); |
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45 else |
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46 error ("rgb2ind: argument is not an RGB image"); |
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47 endif |
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48 endif |
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49 |
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50 if (size (R) != size (G) || size (R) != size (B)) |
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51 error ("rgb2ind: arguments must all have the same size"); |
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52 endif |
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53 |
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54 [hi, wi] = size (R); |
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55 |
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56 X = zeros (hi, wi); |
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57 |
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58 map = zeros (hi*wi, 3); |
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59 |
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60 map(:,1) = R(:); |
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61 map(:,2) = G(:); |
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62 map(:,3) = B(:); |
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63 |
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64 X(:) = 1:(hi*wi); |
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65 |
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66 endfunction |
