Mercurial > octave-libtiff
annotate scripts/image/imwrite.m @ 31211:edbd725ee76c
imwrite: fixed tests to reflect alpha channel behavior for Tiff images
* scripts/image/imwrite.m: modified tests to correctly handled the new
behavior for alpha channel in Tiff images.
* scripts/image/imread.m: added a note in the function documentation
about the alpha channel behavior for Tiff images.
author | magedrifaat <magedrifaat@gmail.com> |
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date | Tue, 06 Sep 2022 21:12:29 +0200 |
parents | 796f54d4ddbf |
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rev | line source |
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1 ######################################################################## |
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2 ## |
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3 ## Copyright (C) 2008-2022 The Octave Project Developers |
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4 ## |
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5 ## See the file COPYRIGHT.md in the top-level directory of this |
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6 ## distribution or <https://octave.org/copyright/>. |
7987 | 7 ## |
8 ## This file is part of Octave. | |
9 ## | |
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10 ## Octave is free software: you can redistribute it and/or modify it |
7987 | 11 ## under the terms of the GNU General Public License as published by |
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12 ## the Free Software Foundation, either version 3 of the License, or |
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13 ## (at your option) any later version. |
7987 | 14 ## |
15 ## Octave is distributed in the hope that it will be useful, but | |
16 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 ## GNU General Public License for more details. |
7987 | 19 ## |
20 ## You should have received a copy of the GNU General Public License | |
21 ## along with Octave; see the file COPYING. If not, see | |
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22 ## <https://www.gnu.org/licenses/>. |
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23 ## |
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24 ######################################################################## |
7987 | 25 |
26 ## -*- texinfo -*- | |
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27 ## @deftypefn {} {} imwrite (@var{img}, @var{filename}) |
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28 ## @deftypefnx {} {} imwrite (@var{img}, @var{filename}, @var{ext}) |
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29 ## @deftypefnx {} {} imwrite (@var{img}, @var{map}, @var{filename}) |
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30 ## @deftypefnx {} {} imwrite (@dots{}, @var{param1}, @var{val1}, @dots{}) |
7987 | 31 ## Write images in various file formats. |
32 ## | |
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33 ## The image @var{img} can be a binary, grayscale, RGB, or multi-dimensional |
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34 ## image. The size and class of @var{img} should be the same as what should |
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35 ## be expected when reading it with @code{imread}: the 3rd and 4th dimensions |
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36 ## reserved for color space, and multiple pages respectively. If it's an |
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37 ## indexed image, the colormap @var{map} must also be specified. |
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38 ## |
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39 ## If @var{ext} is not supplied, the file extension of @var{filename} is used |
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40 ## to determine the format. The actual supported formats are dependent on |
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41 ## options made during the build of Octave. Use @code{imformats} to check |
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42 ## the support of the different image formats. |
7987 | 43 ## |
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44 ## Depending on the file format, it is possible to configure the writing of |
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45 ## images with @var{param}, @var{val} pairs. The following options are |
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46 ## supported: |
8148 | 47 ## |
48 ## @table @samp | |
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49 ## @item Alpha |
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50 ## Alpha (transparency) channel for the image. This must be a matrix with |
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51 ## same class, and number of rows and columns of @var{img}. In case of a |
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52 ## multipage image, the size of the 4th dimension must also match and the third |
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53 ## dimension must be a singleton. By default, image will be completely opaque. |
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54 ## |
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55 ## @item Compression |
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56 ## Compression to use one the image. Can be one of the following: "none" |
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57 ## (default), "bzip", "fax3", "fax4", "jpeg", "lzw", "rle", or "deflate". |
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58 ## Note that not all compression types are available for all image formats |
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59 ## in which it defaults to your @nospell{Magick} library. |
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60 ## |
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61 ## @item DelayTime |
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62 ## For formats that accept animations (such as GIF), controls for how long a |
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63 ## frame is displayed until it moves to the next one. The value must be scalar |
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64 ## (which will applied to all frames in @var{img}), or a vector of length |
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65 ## equal to the number of frames in @var{im}. The value is in seconds, must |
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66 ## be between 0 and 655.35, and defaults to 0.5. |
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67 ## |
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68 ## @item DisposalMethod |
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69 ## For formats that accept animations (such as GIF), controls what happens to |
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70 ## a frame before drawing the next one. Its value can be one of the |
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71 ## following strings: "doNotSpecify" (default); "leaveInPlace"; "restoreBG"; |
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72 ## and "restorePrevious", or a cell array of those string with length equal |
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73 ## to the number of frames in @var{img}. |
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74 ## |
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75 ## @item LoopCount |
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76 ## For formats that accept animations (such as GIF), controls how many times |
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77 ## the sequence is repeated. A value of Inf means an infinite loop (default), |
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78 ## a value of 0 or 1 that the sequence is played only once (loops zero times), |
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79 ## while a value of 2 or above loops that number of times (looping twice means |
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80 ## it plays the complete sequence 3 times). This option is ignored when there |
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81 ## is only a single image at the end of writing the file. |
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82 ## |
8148 | 83 ## @item Quality |
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84 ## Set the quality of the compression. The value should be an integer |
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85 ## between 0 and 100, with larger values indicating higher visual quality and |
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86 ## lower compression. Defaults to 75. |
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87 ## |
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88 ## @item WriteMode |
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89 ## Some file formats, such as TIFF and GIF, are able to store multiple images |
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90 ## in a single file. This option specifies if @var{img} should be appended |
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91 ## to the file (if it exists) or if a new file should be created for it |
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92 ## (possibly overwriting an existing file). The value should be the string |
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93 ## @qcode{"Overwrite"} (default), or @qcode{"Append"}. |
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94 ## |
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95 ## Despite this option, the most efficient method of writing a multipage |
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96 ## image is to pass a 4 dimensional @var{img} to @code{imwrite}, the same |
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97 ## matrix that could be expected when using @code{imread} with the option |
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98 ## @qcode{"Index"} set to @qcode{"all"}. |
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99 ## |
8148 | 100 ## @end table |
101 ## | |
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102 ## @seealso{imread, imfinfo, imformats} |
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104 | |
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105 function imwrite (varargin) |
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106 |
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107 if (nargin < 2) |
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108 print_usage (); |
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109 endif |
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110 |
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111 [filename, ext] = imwrite_filename (varargin{2:end}); |
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112 |
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113 fmt = imformats (ext); |
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114 ## When there is no match, fmt will be a 1x1 structure with |
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115 ## no fields, so we can't just use 'isempty (fmt)'. |
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116 if (numfields (fmt) == 0) |
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117 if (isempty (ext)) |
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118 error ("imwrite: no extension found for %s to identify the image format", |
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119 filename); |
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120 endif |
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121 warning ("imwrite: unlisted image format %s (see imformats). Trying to save anyway.", |
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122 ext); |
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123 __imwrite__ (varargin{:}); |
7987 | 124 else |
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125 fmt.write (varargin{:}); |
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126 endif |
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128 endfunction | |
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129 |
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130 |
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131 ## Test input validation |
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132 %!error <Invalid call> imwrite () # Wrong # of args |
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133 %!error <Invalid call> imwrite (1) # Wrong # of args |
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134 %!error imwrite ({"cell"}, "filename.jpg") # Wrong class for img |
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135 %!error imwrite (1, [], "filename.jpg") # Empty image map |
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136 %!error imwrite (1, 2, 3) # No filename specified |
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137 %!error imwrite (1, "filename") # No fmt specified |
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138 %!error imwrite (1, "filename", "junk") # Invalid fmt specified |
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139 %!error imwrite ([], "filename.jpg") # Empty img matrix |
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140 %!error imwrite (spones (2), "filename.jpg") # Invalid sparse img |
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141 |
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142 %!function [r, cmap, a] = write_and_read (format, varargin) |
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143 %! filename = [tempname() format]; |
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144 %! unwind_protect |
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145 %! imwrite (varargin{1}, filename, varargin{2:end}); |
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146 %! [r, cmap, a] = imread (filename, "Index", "all"); |
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147 %! unwind_protect_cleanup |
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148 %! unlink (filename); |
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149 %! end_unwind_protect |
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150 %!endfunction |
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151 |
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152 ## typical usage with grayscale uint8 images |
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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 %! r = write_and_read (".tif", gray); |
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156 %! assert (r, gray); |
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157 |
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158 ## grayscale uint8 images with alpha channel |
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159 %!testif HAVE_MAGICK |
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160 %! gray = randi (255, 10, 10, 1, "uint8"); |
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161 %! alpha = randi (255, 10, 10, 1, "uint8"); |
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162 %! [r, ~, a] = write_and_read (".tif", gray, "Alpha", alpha); |
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163 %! assert (r, cat (3, gray, alpha)); |
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164 %! assert (a, []); |
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165 |
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166 ## multipage grayscale uint8 images |
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167 %!testif HAVE_MAGICK |
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168 %! gray = randi (255, 10, 10, 1, 5, "uint8"); |
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169 %! r = write_and_read (".tif", gray); |
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170 %! assert (r, gray); |
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171 |
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172 ## multipage RGB uint8 images with alpha channel |
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173 %!testif HAVE_MAGICK |
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174 %! gray = randi (255, 10, 10, 3, 5, "uint8"); |
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175 %! alpha = randi (255, 10, 10, 1, 5, "uint8"); |
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176 %! [r, ~, a] = write_and_read (".tif", gray, "Alpha", alpha); |
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177 %! assert (r, cat (3, gray, alpha)); |
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178 %! assert (a, []); |
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179 |
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180 ## typical usage with RGB uint8 images |
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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 %! r = write_and_read (".tif", rgb); |
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184 %! assert (r, rgb); |
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185 |
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186 ## RGB uint8 images with alpha channel |
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187 %!testif HAVE_MAGICK |
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188 %! rgb = randi (255, 10, 10, 3, "uint8"); |
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189 %! alpha = randi (255, 10, 10, 1, "uint8"); |
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190 %! [r, ~, a] = write_and_read (".tif", rgb, "Alpha", alpha); |
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191 %! assert (r, cat (3, rgb, alpha)); |
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192 %! assert (a, []); |
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193 |
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194 ## multipage RGB uint8 images |
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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 %! r = write_and_read (".tif", rgb); |
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198 %! assert (r, rgb); |
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199 |
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200 ## multipage RGB uint8 images with alpha channel |
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201 %!testif HAVE_MAGICK |
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202 %! rgb = randi (255, 10, 10, 3, 5, "uint8"); |
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203 %! alpha = randi (255, 10, 10, 1, 5, "uint8"); |
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204 %! [r, ~, a] = write_and_read (".tif", rgb, "Alpha", alpha); |
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205 %! assert (r, cat (3, rgb, alpha)); |
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206 %! assert (a, []); |
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207 |
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208 %!testif HAVE_MAGICK |
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209 %! gray = repmat (uint8 (0:255), 100, 1); |
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210 %! [g] = write_and_read (".jpeg", gray); |
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211 %! assert (g, gray, 2); |
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212 |
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213 %!testif HAVE_MAGICK |
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214 %! gray = repmat (uint8 (0:255), 100, 1); |
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215 %! [g] = write_and_read (".jpeg", gray, "quality", 100); |
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216 %! assert (g, gray); |
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217 |
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218 %!function compression = get_bmp_compression (ext, cmap = [], varargin) |
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219 %! gray = repmat (uint8 (0:255), 100, 1); |
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220 %! filename = [tempname() ext]; |
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221 %! unwind_protect |
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222 %! if (isempty (cmap)) |
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223 %! imwrite (gray, filename, varargin{1:end}); |
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224 %! else |
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225 %! imwrite (gray, cmap, filename, varargin{1:end}); |
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226 %! endif |
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227 %! fid = fopen (filename); |
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228 %! unwind_protect |
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229 %! compression = fread (fid, 31)(end); |
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230 %! unwind_protect_cleanup |
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231 %! fclose (fid); |
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Carnë Draug <carandraug@octave.org>
parents:
20158
diff
changeset
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232 %! end_unwind_protect |
5b8e4f668c53
Add compression option to imwrite and default to "none" (bug #45565)
Carnë Draug <carandraug@octave.org>
parents:
20158
diff
changeset
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233 %! unwind_protect_cleanup |
5b8e4f668c53
Add compression option to imwrite and default to "none" (bug #45565)
Carnë Draug <carandraug@octave.org>
parents:
20158
diff
changeset
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234 %! unlink (filename); |
5b8e4f668c53
Add compression option to imwrite and default to "none" (bug #45565)
Carnë Draug <carandraug@octave.org>
parents:
20158
diff
changeset
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235 %! end_unwind_protect |
5b8e4f668c53
Add compression option to imwrite and default to "none" (bug #45565)
Carnë Draug <carandraug@octave.org>
parents:
20158
diff
changeset
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236 %!endfunction |
5b8e4f668c53
Add compression option to imwrite and default to "none" (bug #45565)
Carnë Draug <carandraug@octave.org>
parents:
20158
diff
changeset
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237 |
22489
93ea313301f9
test: Add bug ids (<#####>) to BIST tests.
Rik <rik@octave.org>
parents:
22323
diff
changeset
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238 ## BMP images must be saved uncompressed by default |
23573
1b4f4ec53b4a
use new script to tag fixed bugs in tests
John W. Eaton <jwe@octave.org>
parents:
23572
diff
changeset
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239 %!testif HAVE_MAGICK <*45565> |
21580
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
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240 %! assert (get_bmp_compression ("", [], "BMP"), 0); |
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
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241 %! assert (get_bmp_compression ("", [], "bmp"), 0); |
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
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242 %! assert (get_bmp_compression (".BMP"), 0); |
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
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243 %! assert (get_bmp_compression (".bmp"), 0); |
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
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244 %! assert (get_bmp_compression (".bmp", [], "bmp"), 0); |
ecce63c99c3f
maint: Add semicolons to terminate code in %! blocks.
Rik <rik@octave.org>
parents:
21568
diff
changeset
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245 %! 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
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246 %! assert (get_bmp_compression (".bmp", gray (256), "Compression", "rle"), 1); |