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annotate scripts/image/ind2gray.m @ 7016:93c65f2a5668

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[project @ 2007-10-12 06:40:56 by jwe]
author jwe
date Fri, 12 Oct 2007 06:41:26 +0000
parents 673686daec87
children a1dbe9d80eee
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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 3 of the License, or (at
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
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8 ## your option) 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, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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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 ## @seealso{gray2ind, rgb2ntsc, image, colormap}
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25 ## @end deftypefn
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27 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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28 ## Created: July 1994
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29 ## Adapted-By: jwe
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31 function Y = ind2gray (X, map)
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33 if (nargin < 1 || nargin > 2)
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34 print_usage ();
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35 elseif (nargin == 1)
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36 map = colormap ();
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37 endif
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39 [rows, cols] = size (X);
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40
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41 ## Convert colormap to intensity values (the first column of the
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42 ## result of the call to rgb2ntsc) and then replace indices in
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43 ## the input matrix with indexed values in the output matrix (indexed
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44 ## values are the result of indexing the intensity values by the
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45 ## elements of X(:)).
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47 Y = reshape (((rgb2ntsc (map))(:,1))(X(:)), rows, cols);
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48
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49 endfunction