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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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19 |
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20 ## @deftypefn {Function File} {} ntsc2rgb (@var{yiq}) |
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21 ## Image format conversion. |
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22 ## @end deftypefn |
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23 |
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24 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
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25 ## Created: July 1994 |
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26 ## Adapted-By: jwe |
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27 |
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28 function rgb = ntsc2rgb (yiq) |
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29 |
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30 if (nargin != 1) |
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31 usage ("ntsc2rgb (yiq)"); |
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32 endif |
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33 |
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34 trans = [ 1.0, 1.0, 1.0; |
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35 0.95617, -0.27269, -1.10374; |
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36 0.62143, -0.64681, 1.70062 ]; |
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37 |
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38 rgb = yiq * trans; |
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39 |
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40 endfunction |
