Mercurial > octave-nkf
annotate scripts/image/ind2gray.m @ 15689:14b7679891dd
ind2sub ind2gray: merge common code in private function, expanding fix for images when integers, input check, and expansion of colormap to ind2gray.
| author | Carnë Draug <carandraug+dev@gmail.com> |
|---|---|
| date | Mon, 12 Nov 2012 04:53:42 +0000 |
| parents | 1f911333ed3d |
| children | a1b634240352 |
| rev | line source |
|---|---|
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maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1994-2012 John W. Eaton |
| 2313 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
| 8 ## your option) any later version. | |
| 2313 | 9 ## |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 7016 | 16 ## along with Octave; see the file COPYING. If not, see |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 1024 | 18 |
| 3381 | 19 ## -*- texinfo -*- |
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Rik <octave@nomad.inbox5.com>
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20 ## @deftypefn {Function File} {} ind2gray (@var{x}) |
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Rik <octave@nomad.inbox5.com>
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21 ## @deftypefnx {Function File} {} ind2gray (@var{x}, @var{map}) |
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Rik <octave@nomad.inbox5.com>
parents:
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22 ## Convert a color indexed image to a gray scale intensity image. |
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ind2sub ind2gray: merge common code in private function, expanding fix for images when integers, input check, and expansion of colormap to ind2gray.
Carnë Draug <carandraug+dev@gmail.com>
parents:
14260
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23 ## If the colormap doesn't contain enough colors, pad it with the |
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14b7679891dd
ind2sub ind2gray: merge common code in private function, expanding fix for images when integers, input check, and expansion of colormap to ind2gray.
Carnë Draug <carandraug+dev@gmail.com>
parents:
14260
diff
changeset
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24 ## last color in the map. |
| 3373 | 25 ## If @var{map} is omitted, the current colormap is used to determine the |
| 26 ## intensities. | |
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Rik <octave@nomad.inbox5.com>
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27 ## @seealso{gray2ind, ind2rgb} |
| 3373 | 28 ## @end deftypefn |
| 904 | 29 |
| 3202 | 30 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
| 2312 | 31 ## Created: July 1994 |
| 32 ## Adapted-By: jwe | |
| 559 | 33 |
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Rik <octave@nomad.inbox5.com>
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34 function y = ind2gray (x, map) |
| 1024 | 35 |
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15689
14b7679891dd
ind2sub ind2gray: merge common code in private function, expanding fix for images when integers, input check, and expansion of colormap to ind2gray.
Carnë Draug <carandraug+dev@gmail.com>
parents:
14260
diff
changeset
|
36 ## Do we have the right number of inputs? |
| 1024 | 37 if (nargin < 1 || nargin > 2) |
| 6046 | 38 print_usage (); |
| 1024 | 39 elseif (nargin == 1) |
| 40 map = colormap (); | |
| 559 | 41 endif |
| 42 | |
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15689
14b7679891dd
ind2sub ind2gray: merge common code in private function, expanding fix for images when integers, input check, and expansion of colormap to ind2gray.
Carnë Draug <carandraug+dev@gmail.com>
parents:
14260
diff
changeset
|
43 [x, map] = ind2x ("ind2gray", x, map); |
| 917 | 44 |
| 3486 | 45 ## Convert colormap to intensity values (the first column of the |
| 46 ## result of the call to rgb2ntsc) and then replace indices in | |
| 47 ## the input matrix with indexed values in the output matrix (indexed | |
| 6653 | 48 ## values are the result of indexing the intensity values by the |
|
11469
c776f063fefe
Overhaul m-script files to use common variable name between code and documentation.
Rik <octave@nomad.inbox5.com>
parents:
7017
diff
changeset
|
49 ## elements of x(:)). |
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15689
14b7679891dd
ind2sub ind2gray: merge common code in private function, expanding fix for images when integers, input check, and expansion of colormap to ind2gray.
Carnë Draug <carandraug+dev@gmail.com>
parents:
14260
diff
changeset
|
50 y = reshape (((rgb2ntsc (map))(:,1))(x(:)), rows (x), columns (x)); |
| 559 | 51 |
| 52 endfunction |