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Backed out changeset 7f3a1a90f4f4
author Jaroslav Hajek <highegg@gmail.com>
date Wed, 27 May 2009 07:43:20 +0200
parents 7f3a1a90f4f4
children ab563d2adc10 1d4212b80713
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1 ## Copyright (C) 2008, 2009 Thomas L. Scofield <scofield@calvin.edu>
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2 ## Copyright (C) 2008 Kristian Rumberg <kristianrumberg@gmail.com>
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3 ## Copyright (C) 2006 Thomas Weber <thomas.weber.mail@gmail.com>
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4 ## Copyright (C) 2005 Stefan van der Walt <stefan@sun.ac.za>
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5 ## Copyright (C) 2002 Andy Adler
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6 ##
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7 ## This file is part of Octave.
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8 ##
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9 ## Octave is free software; you can redistribute it and/or modify it
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10 ## under the terms of the GNU General Public License as published by
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11 ## the Free Software Foundation; either version 3 of the License, or (at
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12 ## your option) any later version.
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13 ##
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14 ## Octave is distributed in the hope that it will be useful, but
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15 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ## General Public License for more details.
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18 ##
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19 ## You should have received a copy of the GNU General Public License
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20 ## along with Octave; see the file COPYING. If not, see
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21 ## <http://www.gnu.org/licenses/>.
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22
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23 ## -*- texinfo -*-
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24 ## @deftypefn {Function File} {[@var{img}, @var{map}, @var{alpha}] =} imread (@var{filename})
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25 ## Read images from various file formats.
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26 ##
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27 ## The size and numeric class of the output depends on the
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28 ## format of the image. A color image is returned as an
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29 ## MxNx3 matrix. Grey-level and black-and-white images are
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30 ## of size MxN.
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31 ## The color depth of the image determines the numeric
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32 ## class of the output: "uint8" or "uint16" for grey
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33 ## and color, and "logical" for black and white.
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34 ##
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35 ## @seealso{imwrite, imfinfo}
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36 ## @end deftypefn
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37
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38 function varargout = imread (filename, varargin)
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39
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40 if (nargin < 1)
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41 print_usage ();
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42 endif
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43
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44 if (! ischar (filename))
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45 error ("imread: filename must be a string");
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46 endif
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47
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48 filename = tilde_expand (filename);
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49
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50 fn = file_in_path (IMAGE_PATH, filename);
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51
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52 if (isempty (fn))
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53 error ("imread: cannot find %s", filename);
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54 endif
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55
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56 try
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57 [varargout{1:nargout}] = __magick_read__ (fn, varargin{:});
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58 catch
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59
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60 magick_error = lasterr ();
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61
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62 img_field = false;
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63 x_field = false;
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64 map_field = false;
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65
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66 try
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67 vars = load (fn);
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68 if (isstruct (vars))
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69 img_field = isfield (vars, "img");
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70 x_field = isfield (vars, "X");
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71 map_field = isfield (vars, "map");
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72 endif
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73 catch
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74 error ("imread: invalid image file: %s", magick_error);
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75 end_try_catch
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76
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77 if (map_field && (img_field || x_field))
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78 varargout{2} = vars.map;
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79 if (img_field)
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80 varargout{1} = vars.img;
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81 else
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82 varargout{1} = vars.X;
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83 endif
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84 else
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85 error ("imread: invalid Octave image file format");
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86 endif
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87
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88 end_try_catch
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89
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90 endfunction