Mercurial > hg > octave-nkf
annotate scripts/image/imwrite.m @ 14570:d07d96e53612 stable
seconds after the minute can be 0-60, not 0-61
* system.txi (Timing Utilities): Correct possible values for number of
seconds in time structures. From Rafael Arndt <rafaelarndt@gmail.com>.
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Tue, 17 Apr 2012 14:42:49 -0400 |
| parents | 72c96de7a403 |
| children | f3d52523cde1 |
| rev | line source |
|---|---|
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1 ## Copyright (C) 2008-2012 John W. Eaton |
| 7987 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7 ## the Free Software Foundation; either version 3 of the License, or (at | |
| 8 ## your option) any later version. | |
| 9 ## | |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 16 ## along with Octave; see the file COPYING. If not, see | |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 18 | |
| 19 ## -*- texinfo -*- | |
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20 ## @deftypefn {Function File} {} imwrite (@var{img}, @var{filename}) |
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21 ## @deftypefnx {Function File} {} imwrite (@var{img}, @var{filename}, @var{fmt}) |
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22 ## @deftypefnx {Function File} {} imwrite (@var{img}, @var{filename}, @var{fmt}, @var{p1}, @var{v1}, @dots{}) |
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23 ## @deftypefnx {Function File} {} imwrite (@var{img}, @var{map}, @var{filename}, @dots{}) |
| 7987 | 24 ## Write images in various file formats. |
| 25 ## | |
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26 ## If @var{fmt} is not supplied, the file extension of @var{filename} is used |
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27 ## to determine the format. |
| 7987 | 28 ## |
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29 ## The parameter-value pairs (@var{p1}, @var{v1}, @dots{}) are optional. |
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30 ## Currently the following options are supported for @t{JPEG} images: |
| 8148 | 31 ## |
| 32 ## @table @samp | |
| 33 ## @item Quality | |
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34 ## Set the quality of the compression. The value should be an |
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35 ## integer between 0 and 100, with larger values indicating higher visual |
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36 ## quality and lower compression. |
| 8148 | 37 ## @end table |
| 38 ## | |
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39 ## @strong{Supported Formats} |
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40 ## @multitable @columnfractions .33 .66 |
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41 ## @headitem Extension @tab Format |
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42 ## @item bmp @tab Windows Bitmap |
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43 ## @item gif @tab Graphics Interchange Format |
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44 ## @item jpg and jpeg @tab Joint Photographic Experts Group |
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45 ## @item pbm @tab Portable Bitmap |
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46 ## @item pcx @tab |
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47 ## @item pgm @tab Portable Graymap |
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48 ## @item png @tab Portable Network Graphics |
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49 ## @item pnm @tab Portable Anymap |
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50 ## @item ppm @tab Portable Pixmap |
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51 ## @item ras @tab Sun Raster |
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52 ## @item tif and tiff @tab Tagged Image File Format |
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53 ## @item xwd @tab X11 Dump |
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54 ## @end multitable |
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55 ## |
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56 ## @strong{Unsupported Formats} |
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57 ## @multitable @columnfractions .33 .66 |
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58 ## @headitem Extension @tab Format |
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59 ## @item hdf @tab Hierarchical Data Format V4 |
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60 ## @item @nospell{jp2} and jpx @tab Joint Photographic Experts Group 2000 |
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61 ## @end multitable |
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62 ## |
| 8148 | 63 ## @seealso{imread, imfinfo} |
| 7987 | 64 ## @end deftypefn |
| 65 | |
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66 function imwrite (img, varargin) |
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67 |
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68 persistent imwrite_possible_formats = { |
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69 "bmp"; "gif"; "jp2"; "jpg"; "jpx"; "jpeg"; "hdf"; "pbm"; "pcx"; |
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70 "pgm"; "png"; "pnm"; "ppm"; "ras"; "tif"; "tiff"; "xwd" }; |
| 7987 | 71 |
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72 persistent accepted_formats = __magick_format_list__ (imwrite_possible_formats); |
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73 |
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74 if (nargin < 2 || ! (isnumeric (img) || islogical (img))) |
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75 print_usage (); |
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76 endif |
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77 |
| 7987 | 78 map = []; |
| 79 fmt = ""; | |
| 80 | |
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81 offset = 1; |
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82 if (isnumeric (varargin{1})) |
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83 map = varargin{1}; |
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84 if (isempty (map)) |
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85 error ("imwrite: colormap must not be empty"); |
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86 endif |
| 7987 | 87 offset = 2; |
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88 endif |
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89 if (offset <= length (varargin) && ischar (varargin{offset})) |
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90 filename = varargin{offset}; |
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91 offset++; |
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92 if (rem (length (varargin) - offset, 2) == 0 && ischar (varargin{offset})) |
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93 fmt = varargin{offset}; |
| 7987 | 94 offset++; |
| 95 endif | |
| 96 else | |
| 97 print_usage (); | |
| 98 endif | |
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99 if (offset < length (varargin)) |
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100 has_param_list = 1; |
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101 for ii = offset:2:(length (varargin) - 1) |
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102 options.(varargin{ii}) = varargin{ii + 1}; |
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103 endfor |
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104 else |
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105 has_param_list = 0; |
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106 endif |
| 7987 | 107 |
| 108 filename = tilde_expand (filename); | |
| 109 | |
| 110 if (isempty (fmt)) | |
| 111 [d, n, fmt] = fileparts (filename); | |
| 112 if (! isempty (fmt)) | |
| 113 fmt = fmt(2:end); | |
| 114 endif | |
| 115 endif | |
| 116 | |
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117 if (isempty (img)) |
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118 error ("imwrite: invalid empty image"); |
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119 endif |
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120 |
| 7987 | 121 if (issparse (img) || issparse (map)) |
| 122 error ("imwrite: sparse images not supported"); | |
| 123 endif | |
| 124 | |
| 125 if (! strcmp (fmt, accepted_formats)) | |
| 126 error ("imwrite: %s: unsupported or invalid image format", fmt); | |
| 127 endif | |
| 128 | |
| 129 img_class = class (img); | |
| 130 map_class = class (map); | |
| 8054 | 131 nd = ndims (img); |
| 7987 | 132 |
| 133 if (isempty (map)) | |
| 134 if (any (strcmp (img_class, {"logical", "uint8", "uint16", "double"}))) | |
| 135 if ((nd == 2 || nd == 3) && strcmp (img_class, "double")) | |
| 8054 | 136 img = uint8 (img * 255); |
| 7987 | 137 endif |
| 8054 | 138 ## FIXME -- should we handle color images w/ alpha channel here? |
| 139 if (nd == 3 && size (img, 3) < 3) | |
| 140 error ("imwrite: invalid dimensions for truecolor image"); | |
| 7987 | 141 endif |
| 142 if (nd > 5) | |
| 8054 | 143 error ("imwrite: invalid %d-dimensional image data", nd); |
| 7987 | 144 endif |
| 145 else | |
| 146 error ("imwrite: %s: invalid class for truecolor image", img_class); | |
| 147 endif | |
| 8054 | 148 if (has_param_list) |
| 149 __magick_write__ (filename, fmt, img, options); | |
| 150 else | |
| 151 __magick_write__ (filename, fmt, img); | |
| 152 endif | |
| 7987 | 153 else |
| 154 if (any (strcmp (img_class, {"uint8", "uint16", "double"}))) | |
| 155 if (strcmp (img_class, "double")) | |
| 8054 | 156 img = uint8 (img - 1); |
| 7987 | 157 endif |
| 8054 | 158 if (nd != 2 && nd != 4) |
| 159 error ("imwrite: invalid size for indexed image"); | |
| 7987 | 160 endif |
| 161 else | |
| 162 error ("imwrite: %s: invalid class for indexed image data", img_class); | |
| 163 endif | |
| 164 if (isa (map, "double")) | |
| 165 if (ndims (map) != 2 || size (map, 2) != 3) | |
| 8054 | 166 error ("imwrite: invalid size for colormap"); |
| 7987 | 167 endif |
| 168 else | |
| 169 error ("imwrite: %s invalid class for indexed image colormap", | |
| 8054 | 170 class (map)); |
| 7987 | 171 endif |
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172 |
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173 ## FIXME -- we should really be writing indexed images here but |
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174 ## __magick_write__ needs to be fixed to handle them. |
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175 |
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176 [r, g, b] = ind2rgb (img, map); |
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177 tmp = uint8 (cat (3, r, g, b) * 255); |
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178 |
| 8054 | 179 if (has_param_list) |
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180 __magick_write__ (filename, fmt, tmp, options); |
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181 ## __magick_write__ (filename, fmt, img, map, options); |
| 8054 | 182 else |
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183 __magick_write__ (filename, fmt, tmp); |
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184 ## __magick_write__ (filename, fmt, img, map); |
| 8054 | 185 endif |
| 7987 | 186 endif |
| 187 | |
| 188 endfunction | |
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189 |
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imwrite.m: Allow writing of 1-bit (B&W) images.
Rik <octave@nomad.inbox5.com>
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190 %% Test input validation |
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191 %!error imwrite () # Wrong # of args |
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192 %!error imwrite (1) # Wrong # of args |
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193 %!error imwrite ({"cell"}, "filename.jpg") # Wrong class for img |
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Rik <octave@nomad.inbox5.com>
parents:
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194 %!error imwrite (1, [], "filename.jpg") # Empty image map |
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195 %!error imwrite (1, 2, 3) # No filename specified |
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Rik <octave@nomad.inbox5.com>
parents:
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196 %!error imwrite (1, "filename") # No fmt specified |
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Rik <octave@nomad.inbox5.com>
parents:
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197 %!error imwrite (1, "filename", "junk") # Invalid fmt specified |
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Rik <octave@nomad.inbox5.com>
parents:
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198 %!error imwrite ([], "filename.jpg") # Empty img matrix |
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parents:
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199 %!error imwrite (spones(2), "filename.jpg") # Invalid sparse img |
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parents:
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200 |