Mercurial > octave-libtiff
annotate scripts/image/imwrite.m @ 23573:1b4f4ec53b4a
use new script to tag fixed bugs in tests
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 09 Jun 2017 17:44:57 -0400 |
parents | 0703d31e1ec0 |
children | 194eb4bd202b |
rev | line source |
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1 ## Copyright (C) 2008-2017 John W. Eaton |
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2 ## Copyright (C) 2013-2016 Carnë Draug |
7987 | 3 ## |
4 ## This file is part of Octave. | |
5 ## | |
6 ## Octave is free software; you can redistribute it and/or modify it | |
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 |
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9 ## (at your option) any later version. |
7987 | 10 ## |
11 ## Octave is distributed in the hope that it will be useful, but | |
12 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 ## GNU General Public License for more details. |
7987 | 15 ## |
16 ## You should have received a copy of the GNU General Public License | |
17 ## along with Octave; see the file COPYING. If not, see | |
18 ## <http://www.gnu.org/licenses/>. | |
19 | |
20 ## -*- texinfo -*- | |
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21 ## @deftypefn {} {} imwrite (@var{img}, @var{filename}) |
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22 ## @deftypefnx {} {} imwrite (@var{img}, @var{filename}, @var{ext}) |
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23 ## @deftypefnx {} {} imwrite (@var{img}, @var{map}, @var{filename}) |
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24 ## @deftypefnx {} {} imwrite (@dots{}, @var{param1}, @var{val1}, @dots{}) |
7987 | 25 ## Write images in various file formats. |
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. |
7987 | 37 ## |
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38 ## Depending on the file format, it is possible to configure the writing of |
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39 ## images with @var{param}, @var{val} pairs. The following options are |
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40 ## supported: |
8148 | 41 ## |
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 opaque. |
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48 ## |
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49 ## @item Compression |
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50 ## Compression to use one the image. Can be one of the following: "none" |
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51 ## (default), "bzip", "fax3", "fax4", "jpeg", "lzw", "rle", or "deflate". |
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52 ## Note that not all compression types are available for all image formats |
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53 ## in which it defaults to your @nospell{Magick} library. |
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54 ## |
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55 ## @item DelayTime |
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56 ## For formats that accept animations (such as GIF), controls for how long a |
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57 ## frame is displayed until it moves to the next one. The value must be scalar |
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58 ## (which will applied to all frames in @var{img}), or a vector of length |
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59 ## equal to the number of frames in @var{im}. The value is in seconds, must |
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60 ## be between 0 and 655.35, and defaults to 0.5. |
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61 ## |
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62 ## @item DisposalMethod |
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63 ## For formats that accept animations (such as GIF), controls what happens to |
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64 ## a frame before drawing the next one. Its value can be one of the |
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65 ## following strings: "doNotSpecify" (default); "leaveInPlace"; "restoreBG"; |
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66 ## and "restorePrevious", or a cell array of those string with length equal |
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67 ## to the number of frames in @var{img}. |
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68 ## |
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69 ## @item LoopCount |
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70 ## For formats that accept animations (such as GIF), controls how many times |
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71 ## the sequence is repeated. A value of Inf means an infinite loop (default), |
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72 ## a value of 0 or 1 that the sequence is played only once (loops zero times), |
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73 ## while a value of 2 or above loops that number of times (looping twice means |
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74 ## it plays the complete sequence 3 times). This option is ignored when there |
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75 ## is only a single image at the end of writing the file. |
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76 ## |
8148 | 77 ## @item Quality |
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78 ## Set the quality of the compression. The value should be an integer |
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79 ## between 0 and 100, with larger values indicating higher visual quality and |
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80 ## lower compression. Defaults to 75. |
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81 ## |
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82 ## @item WriteMode |
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83 ## Some file formats, such as TIFF and GIF, are able to store multiple images |
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84 ## in a single file. This option specifies if @var{img} should be appended |
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85 ## to the file (if it exists) or if a new file should be created for it |
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86 ## (possibly overwriting an existing file). The value should be the string |
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87 ## @qcode{"Overwrite"} (default), or @qcode{"Append"}. |
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88 ## |
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89 ## Despite this option, the most efficient method of writing a multipage |
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90 ## image is to pass a 4 dimensional @var{img} to @code{imwrite}, the same |
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91 ## matrix that could be expected when using @code{imread} with the option |
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92 ## @qcode{"Index"} set to @qcode{"all"}. |
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93 ## |
8148 | 94 ## @end table |
95 ## | |
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96 ## @seealso{imread, imfinfo, imformats} |
7987 | 97 ## @end deftypefn |
98 | |
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99 function imwrite (varargin) |
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100 |
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101 if (nargin < 2) |
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102 print_usage (); |
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103 endif |
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104 |
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105 [filename, ext] = imwrite_filename (varargin{2:end}); |
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106 |
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107 fmt = imformats (ext); |
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108 ## When there is no match, fmt will be a 1x1 structure with |
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109 ## no fields, so we can't just use `isempty (fmt)'. |
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110 if (numfields (fmt) == 0) |
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111 if (isempty (ext)) |
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112 error ("imwrite: no extension found for %s to identify the image format", |
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113 filename); |
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114 endif |
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115 warning ("imwrite: unlisted image format %s (see imformats). Trying to save anyway.", |
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116 ext); |
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117 __imwrite__ (varargin{:}); |
7987 | 118 else |
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119 fmt.write (varargin{:}); |
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120 endif |
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122 endfunction | |
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123 |
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124 |
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125 ## Test input validation |
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126 %!error imwrite () # Wrong # of args |
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127 %!error imwrite (1) # Wrong # of args |
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128 %!error imwrite ({"cell"}, "filename.jpg") # Wrong class for img |
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129 %!error imwrite (1, [], "filename.jpg") # Empty image map |
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130 %!error imwrite (1, 2, 3) # No filename specified |
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131 %!error imwrite (1, "filename") # No fmt specified |
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132 %!error imwrite (1, "filename", "junk") # Invalid fmt specified |
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133 %!error imwrite ([], "filename.jpg") # Empty img matrix |
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134 %!error imwrite (spones (2), "filename.jpg") # Invalid sparse img |
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135 |
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136 %!function [r, cmap, a] = write_and_read (format, varargin) |
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137 %! filename = [tempname() format]; |
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138 %! unwind_protect |
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139 %! imwrite (varargin{1}, filename, varargin{2:end}); |
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140 %! [r, cmap, a] = imread (filename, "Index", "all"); |
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141 %! unwind_protect_cleanup |
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142 %! unlink (filename); |
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143 %! end_unwind_protect |
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144 %!endfunction |
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145 |
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146 ## typical usage with grayscale uint8 images |
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147 %!testif HAVE_MAGICK |
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148 %! gray = randi (255, 10, 10, 1, "uint8"); |
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149 %! r = write_and_read (".tif", gray); |
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150 %! assert (r, gray); |
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151 |
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152 ## grayscale uint8 images with alpha channel |
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153 %!testif HAVE_MAGICK |
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154 %! gray = randi (255, 10, 10, 1, "uint8"); |
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155 %! alpha = randi (255, 10, 10, 1, "uint8"); |
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156 %! [r, ~, a] = write_and_read (".tif", gray, "Alpha", alpha); |
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157 %! assert (r, gray); |
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158 %! assert (a, alpha); |
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159 |
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160 ## multipage grayscale uint8 images |
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161 %!testif HAVE_MAGICK |
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162 %! gray = randi (255, 10, 10, 1, 5, "uint8"); |
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163 %! r = write_and_read (".tif", gray); |
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164 %! assert (r, gray); |
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165 |
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166 ## multipage RGB uint8 images with alpha channel |
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167 %!testif HAVE_MAGICK |
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168 %! gray = randi (255, 10, 10, 3, 5, "uint8"); |
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169 %! alpha = randi (255, 10, 10, 1, 5, "uint8"); |
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170 %! [r, ~, a] = write_and_read (".tif", gray, "Alpha", alpha); |
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171 %! assert (r, gray); |
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172 %! assert (a, alpha); |
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173 |
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174 ## typical usage with RGB uint8 images |
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175 %!testif HAVE_MAGICK |
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176 %! rgb = randi (255, 10, 10, 3, "uint8"); |
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177 %! r = write_and_read (".tif", rgb); |
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178 %! assert (r, rgb); |
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179 |
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180 ## RGB uint8 images with alpha channel |
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181 %!testif HAVE_MAGICK |
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182 %! rgb = randi (255, 10, 10, 3, "uint8"); |
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183 %! alpha = randi (255, 10, 10, 1, "uint8"); |
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184 %! [r, ~, a] = write_and_read (".tif", rgb, "Alpha", alpha); |
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185 %! assert (r, rgb); |
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186 %! assert (a, alpha); |
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187 |
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188 ## multipage RGB uint8 images |
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189 %!testif HAVE_MAGICK |
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190 %! rgb = randi (255, 10, 10, 3, 5, "uint8"); |
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191 %! r = write_and_read (".tif", rgb); |
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192 %! assert (r, rgb); |
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193 |
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194 ## multipage RGB uint8 images with alpha channel |
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195 %!testif HAVE_MAGICK |
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196 %! rgb = randi (255, 10, 10, 3, 5, "uint8"); |
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197 %! alpha = randi (255, 10, 10, 1, 5, "uint8"); |
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198 %! [r, ~, a] = write_and_read (".tif", rgb, "Alpha", alpha); |
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199 %! assert (r, rgb); |
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200 %! assert (a, alpha); |
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201 |
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202 %!testif HAVE_MAGICK |
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203 %! gray = repmat (uint8 (0:255), 100, 1); |
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204 %! [g] = write_and_read (".jpeg", gray); |
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205 %! assert (g, gray, 2); |
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206 |
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207 %!testif HAVE_MAGICK |
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208 %! gray = repmat (uint8 (0:255), 100, 1); |
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209 %! [g] = write_and_read (".jpeg", gray, "quality", 100); |
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210 %! assert (g, gray); |
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211 |
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212 %!function [compression] = get_bmp_compression (ext, cmap = [], varargin) |
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213 %! gray = repmat (uint8 (0:255), 100, 1); |
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214 %! filename = [tempname() ext]; |
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215 %! unwind_protect |
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216 %! if (isempty (cmap)) |
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217 %! imwrite (gray, filename, varargin{1:end}); |
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218 %! else |
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219 %! imwrite (gray, cmap, filename, varargin{1:end}); |
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220 %! endif |
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221 %! fid = fopen (filename); |
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222 %! unwind_protect |
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223 %! compression = fread (fid, 31)(end); |
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224 %! unwind_protect_cleanup |
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225 %! fclose (fid); |
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226 %! end_unwind_protect |
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227 %! unwind_protect_cleanup |
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228 %! unlink (filename); |
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229 %! end_unwind_protect |
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230 %!endfunction |
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231 |
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232 ## BMP images must be saved uncompressed by default |
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233 %!testif HAVE_MAGICK <*45565> |
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maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
|
234 %! assert (get_bmp_compression ("", [], "BMP"), 0); |
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
|
235 %! assert (get_bmp_compression ("", [], "bmp"), 0); |
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
|
236 %! assert (get_bmp_compression (".BMP"), 0); |
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
|
237 %! assert (get_bmp_compression (".bmp"), 0); |
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
|
238 %! assert (get_bmp_compression (".bmp", [], "bmp"), 0); |
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
|
239 %! assert (get_bmp_compression ("", gray (256), "bmp"), 0); |
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
|
240 %! assert (get_bmp_compression (".bmp", gray (256), "Compression", "rle"), 1); |