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1 ## Copyright (C) 1996, 1997 John W. Eaton |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 2, or (at your option) |
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8 ## any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} saveimage (@var{file}, @var{x}, @var{fmt}, @var{map}) |
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22 ## Save the matrix @var{x} to @var{file} in image format @var{fmt}. Valid |
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23 ## values for @var{fmt} are |
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24 ## |
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25 ## @table @code |
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26 ## @item "img" |
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27 ## Octave's image format. The current colormap is also saved in the file. |
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28 ## |
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29 ## @item "ppm" |
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30 ## Portable pixmap format. |
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31 ## |
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32 ## @item "ps" |
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33 ## PostScript format. Note that images saved in PostScript format can not |
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34 ## be read back into Octave with loadimage. |
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35 ## @end table |
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36 ## |
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37 ## If the fourth argument is supplied, the specified colormap will also be |
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38 ## saved along with the image. |
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39 ## |
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40 ## Note: if the colormap contains only two entries and these entries are |
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41 ## black and white, the bitmap ppm and PostScript formats are used. If the |
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42 ## image is a gray scale image (the entries within each row of the colormap |
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43 ## are equal) the gray scale ppm and PostScript image formats are used, |
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44 ## otherwise the full color formats are used. |
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45 ## @seealso{loadimage, save, load, colormap} |
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46 ## @end deftypefn |
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47 |
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48 ## The conversion to PostScript is based on pbmtolps.c, which was |
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49 ## written by |
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50 ## |
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51 ## George Phillips <phillips@cs.ubc.ca> |
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52 ## Department of Computer Science |
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53 ## University of British Columbia |
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54 ## |
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55 ## and is part of the portable bitmap utilities, |
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56 |
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57 ## Author: Tony Richardson <arichard@stark.cc.oh.us> |
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58 ## Created: July 1994 |
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59 ## Adapted-By: jwe |
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60 |
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61 ## Rewritten by jwe to avoid using octoppm and pbm routines so that |
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62 ## people who don't have the pbm stuff installed can still use this |
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63 ## function. |
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64 ## |
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65 ## The conversion to PostScript is based on pnmtops.c, which is part of |
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66 ## the portable bitmap utilties and bears this copyright notice: |
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67 ## |
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68 ## Copyright (C) 1989 by Jef Poskanzer. |
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69 ## |
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70 ## Permission to use, copy, modify, and distribute this software and its |
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71 ## documentation for any purpose and without fee is hereby granted, provided |
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72 ## that the above copyright notice appear in all copies and that both that |
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73 ## copyright notice and this permission notice appear in supporting |
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74 ## documentation. This software is provided "as is" without express or |
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75 ## implied warranty. |
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76 |
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77 function saveimage (filename, img, img_form, map) |
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78 |
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79 if (nargin < 2 || nargin > 4) |
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80 print_usage (); |
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81 endif |
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82 |
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83 if (nargin < 4) |
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84 if (size(img, 3) == 3) |
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85 [img, map] = rgb2ind(img); |
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86 else |
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87 map = colormap (); |
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88 endif |
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89 endif |
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90 |
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91 [map_nr, map_nc] = size (map); |
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92 |
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93 if (map_nc != 3) |
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94 error ("colormap should be an N x 3 matrix"); |
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95 endif |
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96 |
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97 if (nargin < 3) |
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98 img_form = "img"; |
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99 elseif (! ischar (img_form)) |
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100 error ("image format specification must be a string"); |
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101 elseif (! (strcmp (img_form, "img") |
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102 || strcmp (img_form, "ppm") |
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103 || strcmp (img_form, "ps"))) |
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104 error ("unsupported image format specification"); |
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105 endif |
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106 |
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107 if (! ismatrix (img)) |
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108 warning ("image variable is not a matrix"); |
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109 endif |
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110 |
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111 if (! ischar (filename)) |
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112 error ("file name must be a string"); |
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113 endif |
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114 |
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115 ## If we just want Octave image format, save and return. |
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116 |
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117 if (strcmp (img_form, "img")) |
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118 eval (strcat ("save -ascii ", filename, " map img")); |
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119 return; |
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120 endif |
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121 |
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122 ## Convert to another format if requested. |
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123 |
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124 grey = all (map(:,1) == map(:,2) && map(:,1) == map (:,3)); |
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125 |
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126 pbm = pgm = ppm = 0; |
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127 |
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128 map_sz = map_nr * map_nc; |
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129 |
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130 map = reshape (map, map_sz, 1); |
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131 |
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132 map (map > 1) = 1; |
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133 map (map < 0) = 0; |
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134 |
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135 map = round (255 * map); |
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136 |
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137 bw = (map_nr == 2 |
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138 && ((map(1,1) == 0 && map(2,1) == 255) |
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139 || (map(1,1) == 255 && map(2,1) == 0))); |
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140 |
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141 img = round (img'); |
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142 [img_nr, img_nc] = size (img); |
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143 |
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144 img_sz = img_nr * img_nc; |
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145 img = reshape (img, img_sz, 1); |
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146 |
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147 img (img > map_nr) = map_nr; |
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148 img (img <= 0) = 1; |
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149 |
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150 if (strcmp (img_form, "ppm")) |
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151 |
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152 ## Would be nice to make this consistent with the line used by the |
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153 ## load/save functions, but we need a good way to get username and |
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154 ## hostname information. |
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155 |
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156 time_string = ctime (time ()); |
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157 time_string = time_string (1:length (time_string)-1); |
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158 tagline = sprintf ("# Created by Octave %s, %s", |
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159 OCTAVE_VERSION, time_string); |
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160 |
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161 if (grey && bw) |
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162 |
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163 if (map(1) != 0) |
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164 map = [0; 1]; |
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165 else |
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166 map = [1; 0]; |
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167 endif |
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168 |
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169 n_long = rem (img_nc, 8); |
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170 tmp = zeros (ceil (img_nc/8), img_nr); |
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171 |
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172 k = ceil (img_nr/8); |
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173 tmp = zeros (k, img_nc); |
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174 |
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175 ## Append columns with zeros to original image so that |
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176 ## mod (cols, 8) = 0. |
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177 |
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178 bwimg = postpad (reshape (map(img), img_nr, img_nc), k * 8, 0); |
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179 |
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180 b = kron (pow2 (7:-1:0)', ones (1, img_nc)); |
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181 |
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182 for i = 1:k |
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183 tmp(i,:) = sum (bwimg(8*(i-1)+1:8*i,:) .* b); |
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184 endfor |
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185 |
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186 fid = fopen (filename, "wb"); |
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187 fprintf (fid, "P4\n%s\n%d %d\n", tagline, img_nr, img_nc); |
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188 fwrite (fid, tmp, "uchar"); |
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189 fprintf (fid, "\n"); |
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190 fclose (fid); |
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191 |
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192 elseif (grey) |
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193 |
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194 fid = fopen (filename, "wb"); |
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195 fprintf (fid, "P5\n%s\n%d %d\n255\n", tagline, img_nr, img_nc); |
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196 fwrite (fid, map(img), "uchar"); |
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197 fprintf (fid, "\n"); |
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198 fclose (fid); |
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199 |
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200 else |
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201 |
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202 img_idx = ((1:3:3*img_sz)+2)'; |
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203 map_idx = ((2*map_nr+1):map_sz)'; |
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204 |
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205 tmap = map(map_idx); |
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206 tmp(img_idx--) = tmap(img); |
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207 |
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208 map_idx = map_idx - map_nr; |
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209 tmap = map(map_idx); |
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210 tmp(img_idx--) = tmap(img); |
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211 |
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212 map_idx = map_idx - map_nr; |
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213 tmap = map(map_idx); |
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214 tmp(img_idx--) = tmap(img); |
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215 |
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216 fid = fopen (filename, "wb"); |
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217 fprintf (fid, "P6\n%s\n%d %d\n255\n", tagline, img_nr, img_nc); |
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218 fwrite (fid, tmp, "uchar"); |
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219 fprintf (fid, "\n"); |
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220 fclose (fid); |
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221 |
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222 endif |
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223 |
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224 elseif (strcmp (img_form, "ps") == 1) |
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225 |
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226 if (! grey) |
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227 error ("must have a greyscale color map for conversion to PostScript"); |
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228 endif |
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229 |
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230 bps = 8; |
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231 dpi = 300; |
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232 pagewid = 612; |
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233 pagehgt = 762; |
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234 MARGIN = 0.95; |
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235 devpix = dpi / 72.0 + 0.5; |
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236 pixfac = 72.0 / dpi * devpix; |
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237 |
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238 ## Compute padding to round cols * bps up to the nearest multiple of 8 |
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239 ## (nr and nc are switched because we transposed the image above). |
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240 |
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241 padright = (((img_nr * bps + 7) / 8) * 8 - img_nr * bps) / bps; |
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242 |
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243 scols = img_nr * pixfac; |
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244 srows = img_nc * pixfac; |
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245 scale = 1; |
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246 |
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247 if (scols > pagewid * MARGIN || srows > pagehgt * MARGIN) |
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248 if (scols > pagewid * MARGIN) |
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249 scale = scale * (pagewid / scols * MARGIN); |
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250 scols = scale * img_nr * pixfac; |
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251 srows = scale * img_nc * pixfac; |
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252 endif |
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253 if (srows > pagehgt * MARGIN) |
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254 scale = scale * (pagehgt / srows * MARGIN); |
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255 scols = scale * img_nr * pixfac; |
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256 srows = scale * img_nc * pixfac; |
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257 endif |
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258 warning ("image too large for page, rescaling to %g", scale); |
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259 endif |
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260 |
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261 llx = (pagewid - scols) / 2; |
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262 lly = (pagehgt - srows) / 2; |
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263 urx = llx + fix (scols + 0.5); |
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264 ury = lly + fix (srows + 0.5); |
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265 |
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266 fid = fopen (filename, "wb"); |
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267 |
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268 fprintf (fid, "%%!PS-Adobe-2.0 EPSF-2.0\n"); |
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269 fprintf (fid, "%%%%Creator: Octave %s (saveimage.m)\n", OCTAVE_VERSION); |
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270 fprintf (fid, "%%%%Title: %s\n", filename); |
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271 fprintf (fid, "%%%%Pages: 1\n"); |
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272 fprintf (fid, "%%%%BoundingBox: %d %d %d %d\n", |
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273 fix (llx), fix (lly), fix (urx), fix (ury)); |
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274 fprintf (fid, "%%%%EndComments\n"); |
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275 fprintf (fid, "/readstring {\n"); |
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276 fprintf (fid, " currentfile exch readhexstring pop\n"); |
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277 fprintf (fid, "} bind def\n"); |
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278 fprintf (fid, "/picstr %d string def\n", |
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279 fix ((img_nr + padright) * bps / 8)); |
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280 fprintf (fid, "%%%%EndProlog\n"); |
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281 fprintf (fid, "%%%%Page: 1 1\n"); |
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282 fprintf (fid, "gsave\n"); |
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283 fprintf (fid, "%g %g translate\n", llx, lly); |
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284 fprintf (fid, "%g %g scale\n", scols, srows); |
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285 fprintf (fid, "%d %d %d\n", img_nr, img_nc, bps); |
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286 fprintf (fid, "[ %d 0 0 -%d 0 %d ]\n", img_nr, img_nc, img_nc); |
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287 fprintf (fid, "{ picstr readstring }\n"); |
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288 fprintf (fid, "image\n"); |
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289 |
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290 img = map(img); |
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291 |
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292 fmt = "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n"; |
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293 fprintf (fid, fmt, img); |
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294 |
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295 if (rem (img_sz, 30) != 0) |
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296 fprintf (fid, "\n"); |
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297 endif |
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298 |
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299 fprintf (fid, "grestore\n"); |
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300 fprintf (fid, "showpage\n"); |
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301 fprintf (fid, "%%%%Trailer\n"); |
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302 fclose (fid); |
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303 |
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304 else |
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305 error ("saveimage: what happened to the image type?"); |
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306 endif |
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307 |
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308 endfunction |
