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[project @ 1999-11-23 20:54:17 by jwe]
author jwe
date Tue, 23 Nov 1999 20:54:31 +0000
parents 44d82b369c78
children 69b167451491
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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, 59 Temple Place - Suite 330, Boston, MA
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18 ## 02111-1307, USA.
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20 ## @deftypefn {Function File} {} ind2gray (@var{x}, @var{map})
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21 ## Convert an Octave indexed image to a gray scale intensity image.
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22 ## If @var{map} is omitted, the current colormap is used to determine the
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23 ## intensities.
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24 ## @end deftypefn
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26 ## SEE ALSO: gray2ind, rgb2ntsc, image, colormap
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28 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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29 ## Created: July 1994
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30 ## Adapted-By: jwe
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32 function Y = ind2gray (X, map)
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34 if (nargin < 1 || nargin > 2)
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35 usage ("ind2gray (X, map)");
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36 elseif (nargin == 1)
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37 map = colormap ();
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38 endif
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39
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40 ## Convert colormap to intensity values.
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41
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42 yiq = rgb2ntsc (map);
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43 y = yiq(:,1);
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45 ## We need Fortran indexing capability, but be sure to save the user's
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46 ## preference.
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48 pref = do_fortran_indexing;
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49
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50 unwind_protect
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51
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52 do_fortran_indexing = 1;
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53
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54 ## Replace indices in the input matrix with indexed values in the output
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55 ## matrix.
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56
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57 [rows, cols] = size (X);
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58 Y = y(X(:));
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59 Y = reshape (Y, rows, cols);
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61 unwind_protect_cleanup
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62 do_fortran_indexing = pref;
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63 end_unwind_protect
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64
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65 endfunction