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annotate scripts/image/imwrite.m @ 18543:0bfbfb05b158 stable

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imwrite.m: simplify test blocks by make use of shared %!function.
author Carnë Draug <carandraug@octave.org>
date Tue, 04 Mar 2014 19:44:19 +0000
parents 30aa4e85f8d5
children e0cc67d5a462
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1 ## Copyright (C) 2008-2013 John W. Eaton
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2 ## Copyright (C) 2013 Carnë Draug
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## -*- texinfo -*-
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21 ## @deftypefn {Function File} {} imwrite (@var{img}, @var{filename})
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22 ## @deftypefnx {Function File} {} imwrite (@var{img}, @var{filename}, @var{ext})
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23 ## @deftypefnx {Function File} {} imwrite (@var{img}, @var{map}, @var{filename})
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24 ## @deftypefnx {Function File} {} imwrite (@dots{}, @var{param1}, @var{val1}, @dots{})
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25 ## Write images in various file formats.
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26 ##
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27 ## The image @var{img} can be a binary, grayscale, RGB, or multi-dimensional
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28 ## image. The size and class of @var{img} should be the same as what should
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29 ## be expected when reading it with @code{imread}: the 3rd and 4th dimensions
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30 ## reserved for color space, and multiple pages respectively. If it's an
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31 ## indexed image, the colormap @var{map} must also be specified.
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32 ##
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33 ## If @var{ext} is not supplied, the file extension of @var{filename} is used
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34 ## to determine the format. The actual supported formats are dependent on
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35 ## options made during the build of Octave. Use @code{imformats} to check
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36 ## the support of the different image formats.
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37 ##
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38 ## Depending on the file format, it is possible to configure the writing
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39 ## of images with @var{param}, @var{val} pairs. The following options
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40 ## are supported:
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41 ##
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42 ## @table @samp
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43 ## @item Alpha
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44 ## Alpha (transparency) channel for the image. This must be a matrix with
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45 ## same class, and number of rows and columns of @var{img}. In case of a
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46 ## multipage image, the size of the 4th dimension must also match and the third
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47 ## dimension must be a singleton. By default, image will be completely
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48 ## opaque.
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49 ##
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50 ## @item DelayTime
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51 ## For formats that accept animations (such as GIF), controls for how long a
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52 ## frame is displayed until it moves to the next one. The value must be scalar
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53 ## (which will applied to all frames in @var{img}), or a vector of length
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54 ## equal to the number of frames in @var{im}. The value is in seconds, must
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55 ## be between 0 and 655.35, and defaults to 0.5.
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56 ##
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57 ## @item DisposalMethod
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58 ## For formats that accept animations (such as GIF), controls what happens
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59 ## to a frame before drawing the next one. Its value can be one of the
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60 ## following strings: "doNotSpecify" (default); "leaveInPlace"; "restoreBG";
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61 ## and "restorePrevious", or a cell array of those string with length equal
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62 ## to the number of frames in @var{img}.
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63 ##
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64 ## @item LoopCount
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65 ## For formats that accept animations (such as GIF), controls how many times
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66 ## the sequence is repeated. A value of Inf means an infinite loop (default),
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67 ## a value of 0 or 1 that the sequence is played only once (loops zero times),
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68 ## while a value of 2 or above loops that number of times (looping twice means
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69 ## it plays the complete sequence 3 times). This option is ignored when there
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70 ## is only a single image at the end of writing the file.
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71 ##
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72 ## @item Quality
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73 ## Set the quality of the compression. The value should be an
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74 ## integer between 0 and 100, with larger values indicating higher visual
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75 ## quality and lower compression. Defaults to 75.
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76 ##
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77 ## @item WriteMode
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78 ## Some file formats, such as TIFF and GIF, are able to store multiple
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79 ## images in a single file. This option specifies if @var{img} should be
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80 ## appended to the file (if it exists) or if a new file should be created
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81 ## for it (possibly overwriting an existing file). The value should be
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82 ## the string @qcode{"Overwrite"} (default), or @qcode{"Append"}.
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83 ##
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84 ## Despite this option, the most efficient method of writing a multipage
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85 ## image is to pass a 4 dimensional @var{img} to @code{imwrite}, the
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86 ## same matrix that could be expected when using @code{imread} with the
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87 ## option @qcode{"Index"} set to @qcode{"all"}.
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88 ##
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89 ## @end table
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90 ##
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91 ## @seealso{imread, imfinfo, imformats}
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92 ## @end deftypefn
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93
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94 function imwrite (varargin)
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95 if (nargin < 2)
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96 print_usage ();
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97 endif
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98 [filename, ext] = imwrite_filename (varargin{2:end});
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99
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100 fmt = imformats (ext);
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101 ## When there is no match, fmt will be a 1x1 structure with
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102 ## no fields, so we can't just use `isempty (fmt)'.
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103 if (isempty (fieldnames (fmt)))
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104 if (isempty (ext))
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105 error ("imwrite: no extension found for %s to identify the image format",
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106 filename);
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107 endif
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108 warning ("imwrite: unlisted image format %s (see imformats). Trying to save anyway.",
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109 ext);
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110 __imwrite__ (varargin{:});
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111 else
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112 fmt.write (varargin{:});
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113 endif
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114
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115 endfunction
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116
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117 %% Test input validation
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118 %!error imwrite () # Wrong # of args
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119 %!error imwrite (1) # Wrong # of args
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120 %!error imwrite ({"cell"}, "filename.jpg") # Wrong class for img
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121 %!error imwrite (1, [], "filename.jpg") # Empty image map
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122 %!error imwrite (1, 2, 3) # No filename specified
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123 %!error imwrite (1, "filename") # No fmt specified
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124 %!error imwrite (1, "filename", "junk") # Invalid fmt specified
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125 %!error imwrite ([], "filename.jpg") # Empty img matrix
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126 %!error imwrite (spones (2), "filename.jpg") # Invalid sparse img
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127
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128 %!function [r, cmap, a] = write_and_read (varargin)
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129 %! filename = [tmpnam() ".tif"];
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130 %! unwind_protect
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131 %! imwrite (varargin{1}, filename, varargin{2:end});
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132 %! [r, cmap, a] = imread (filename, "Index", "all");
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133 %! unwind_protect_cleanup
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134 %! unlink (filename);
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135 %! end_unwind_protect
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136 %!endfunction
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137
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138 ## typical usage with grayscale uint8 images
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139 %!testif HAVE_MAGICK
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140 %! bw = randi (255, 10, 10, 1, "uint8");
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141 %! r = write_and_read (bw);
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142 %! assert (r, bw)
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143
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144 ## multipage grayscale uint8 images
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145 %!testif HAVE_MAGICK
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146 %! bw = randi (255, 10, 10, 1, 5, "uint8");
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147 %! r = write_and_read (bw);
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148 %! assert (r, bw)
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149
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150 ## typical usage with RGB uint8 images
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151 %!testif HAVE_MAGICK
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152 %! rgb = randi (255, 10, 10, 3, "uint8");
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153 %! r = write_and_read (rgb);
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154 %! assert (r, rgb)
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155
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156 ## multipage RGB uint8 images
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157 %!testif HAVE_MAGICK
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158 %! rgb = randi (255, 10, 10, 3, 5, "uint8");
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159 %! r = write_and_read (rgb);
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160 %! assert (r, rgb)
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161