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1 ### Copyright (C) 1996 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, 59 Temple Place - Suite 330, Boston, MA |
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18 ### 02111-1307, USA. |
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19 |
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20 function saveimage (filename, img, img_form, map) |
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21 |
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2303
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22 ## Save a matrix to disk in image format. |
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23 ## |
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24 ## saveimage (filename, x) saves matrix x to file filename in octave's |
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25 ## image format. The current colormap is saved in the file also. |
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26 ## |
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27 ## saveimage (filename, x, "img") saves the image in the default format |
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28 ## and is the same as saveimage (filename, x). |
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29 ## |
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30 ## saveimage (filename, x, "ppm") saves the image in ppm format instead |
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31 ## of the default octave image format. |
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32 ## |
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33 ## saveimage (filename, x, "ps") saves the image in PostScript format |
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34 ## instead of the default octave image format. (Note: images saved in |
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35 ## PostScript format can not be read back into octave with loadimage.) |
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36 ## |
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37 ## saveimage (filename, x, format, map) saves the image along with the |
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38 ## specified colormap in the specified format. |
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39 ## |
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40 ## Note: If the colormap contains only two entries and these entries |
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41 ## are black and white, the bitmap ppm and PostScript formats are used. |
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42 ## If the image is a gray scale image (the entries within each row of |
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43 ## the colormap are equal) the gray scale ppm and PostScript image |
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44 ## formats are used, otherwise the full color formats are used. |
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45 ## |
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46 ## The conversion to PostScript is based on pbmtolps.c, which was |
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47 ## written by |
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48 ## |
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49 ## George Phillips <phillips@cs.ubc.ca> |
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50 ## Department of Computer Science |
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51 ## University of British Columbia |
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52 ## |
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53 ## and is part of the portable bitmap utilities, |
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54 ## |
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55 ## SEE ALSO: loadimage, save, load, colormap |
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56 |
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57 ## Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994. |
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58 |
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59 ## Rewritten by jwe to avoid using octoppm and pbm routines so that |
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60 ## people who don't have the the pbm stuff installed can still use this |
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61 ## function. |
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62 ## |
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63 ## The conversion to PostScript is based on pnmtops.c, which is part of |
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64 ## the portable bitmap utilties and bears this copyright notice: |
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65 ## |
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66 ## Copyright (C) 1989 by Jef Poskanzer. |
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67 ## |
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68 ## Permission to use, copy, modify, and distribute this software and its |
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69 ## documentation for any purpose and without fee is hereby granted, provided |
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70 ## that the above copyright notice appear in all copies and that both that |
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71 ## copyright notice and this permission notice appear in supporting |
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72 ## documentation. This software is provided "as is" without express or |
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73 ## implied warranty. |
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74 |
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1024
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75 if (nargin < 2 || nargin > 4) |
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76 usage ("saveimage (filename, matrix, [format, [colormap]])"); |
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77 endif |
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78 |
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79 if (nargin < 4) |
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80 map = colormap (); |
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81 endif |
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1507
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82 |
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83 [map_nr, map_nc] = size (map); |
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84 |
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85 if (map_nc != 3) |
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86 error ("colormap should be an N x 3 matrix"); |
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87 endif |
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88 |
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89 if (nargin < 3) |
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90 img_form = "img"; |
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91 elseif (! isstr (img_form)) |
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92 error ("image format specification must be a string"); |
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93 elseif (! (strcmp (img_form, "img") |
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94 || strcmp (img_form, "ppm") |
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95 || strcmp (img_form, "ps"))) |
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96 error ("unsupported image format specification"); |
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97 endif |
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98 |
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99 if (! is_matrix (img)) |
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100 warning ("image variable is not a matrix"); |
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101 endif |
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102 |
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103 if (! isstr (filename)) |
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104 error ("file name must be a string"); |
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105 endif |
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106 |
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107 ## If we just want Octave image format, save and return. |
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108 |
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109 if (strcmp (img_form, "img")) |
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110 eval (strcat ("save -ascii ", filename, " map img")); |
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111 return; |
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112 endif |
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113 |
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114 ## Convert to another format if requested. |
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115 |
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116 grey = all (map(:,1) == map(:,2) && map(:,1) == map (:,3)); |
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117 |
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118 pbm = pgm = ppm = 0; |
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119 |
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120 map_sz = map_nr * map_nc; |
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121 |
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122 map = reshape (map, map_sz, 1); |
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123 |
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124 idx = find (map > 1); |
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125 map (idx) = ones (size (idx)); |
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126 |
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127 idx = find (map < 0); |
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128 map (idx) = zeros (size (idx)); |
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129 |
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130 map = round (255 * map); |
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131 |
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132 bw = (map_nr == 2 |
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133 && ((map(1,1) == 0 && map(2,1) == 255) |
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134 || (map(1,1) == 255 && map(2,1) == 0))); |
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135 |
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136 img = round (img'); |
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137 [img_nr, img_nc] = size (img); |
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138 |
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139 img_sz = img_nr * img_nc; |
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140 img = reshape (img, img_sz, 1); |
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141 |
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142 idx = find (img >= map_nr - 1); |
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143 img (idx) = ones (size (idx)) * map_nr; |
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144 |
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145 idx = find (img <= 0); |
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146 img (idx) = ones (size (idx)); |
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147 |
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148 if (strcmp (img_form, "ppm")) |
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149 if (grey && map_nr == 2 && bw) |
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150 |
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151 map = map(:,1); |
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152 |
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153 if (map(1) != 0) |
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154 map(1) = 1; |
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155 else |
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156 map(2) = 1; |
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157 endif |
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158 |
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159 img = map(img); |
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160 n_long = rem (img_sz, 8); |
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161 if (n_long == 0) |
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162 n_long = 8; |
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163 else |
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164 n_long = 1 + nlong; |
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165 endif |
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166 |
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167 idx = 1:8:img_sz; |
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168 s_len = length (idx) - 1; |
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169 |
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170 tmp = img (1:8:img_sz) * 128; |
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171 for i = 2:n_long |
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172 tmp = tmp + img (i:8:img_sz) * 2^(8-i); |
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173 endfor |
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174 for i = (n_long+1):8 |
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175 tmp(1:s_len) = tmp(1:s_len) + img (i:8:img_sz) * 2^(8-i); |
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176 endfor |
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177 |
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178 fid = fopen (filename, "w"); |
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179 fprintf (fid, "P4\n%d %d\n", img_nr, img_nc); |
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180 fwrite (fid, tmp, "char"); |
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181 fprintf (fid, "\n"); |
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182 fclose (fid); |
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183 |
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184 elseif (grey) |
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185 |
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186 fid = fopen (filename, "w"); |
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187 fprintf (fid, "P5\n%d %d\n255\n", img_nr, img_nc); |
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188 fwrite (fid, map(img), "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 else |
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193 |
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194 img_idx = ((1:3:3*img_sz)+2)'; |
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195 map_idx = ((2*map_nr+1):map_sz)'; |
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196 |
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197 tmap = map(map_idx); |
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198 tmp(img_idx--) = tmap(img); |
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199 |
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200 map_idx = map_idx - map_nr; |
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201 tmap = map(map_idx); |
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202 tmp(img_idx--) = tmap(img); |
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203 |
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204 map_idx = map_idx - map_nr; |
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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 fid = fopen (filename, "w"); |
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209 fprintf (fid, "P6\n%d %d\n255\n", img_nr, img_nc); |
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210 fwrite (fid, tmp, "uchar"); |
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211 fprintf (fid, "\n"); |
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212 fclose (fid); |
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213 |
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214 endif |
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215 |
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216 elseif (strcmp (img_form, "ps") == 1) |
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217 |
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218 if (! grey) |
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219 error ("must have a greyscale color map for conversion to PostScript"); |
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220 endif |
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221 |
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222 bps = 8; |
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223 dpi = 300; |
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224 pagewid = 612; |
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225 pagehgt = 762; |
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226 MARGIN = 0.95; |
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227 devpix = dpi / 72.0 + 0.5; |
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228 pixfac = 72.0 / dpi * devpix; |
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229 |
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230 ## Compute padding to round cols * bps up to the nearest multiple of 8 |
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231 ## (nr and nc are switched because we transposed the image above). |
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232 |
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233 padright = (((img_nr * bps + 7) / 8) * 8 - img_nr * bps) / bps; |
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234 |
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235 scols = img_nr * pixfac; |
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236 srows = img_nc * pixfac; |
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237 |
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238 if (scols > pagewid * MARGIN || srows > pagehgt * MARGIN) |
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239 if (scols > pagewid * MARGIN) |
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240 scale = scale * (pagewid / scols * MARGIN); |
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241 scols = scale * img_nr * pixfac; |
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242 srows = scale * img_nc * pixfac; |
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243 endif |
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244 if (srows > pagehgt * MARGIN) |
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245 scale = scale * (pagehgt / srows * MARGIN); |
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246 scols = scale * img_nr * pixfac; |
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247 srows = scale * img_nc * pixfac; |
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248 endif |
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249 warning ("image too large for page, rescaling to %g", scale); |
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250 endif |
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251 |
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252 llx = (pagewid - scols) / 2; |
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253 lly = (pagehgt - srows) / 2; |
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254 urx = llx + fix (scols + 0.5); |
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255 ury = lly + fix (srows + 0.5); |
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256 |
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257 fid = fopen (filename, "w"); |
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258 |
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259 fprintf (fid, "%%!PS-Adobe-2.0 EPSF-2.0\n"); |
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260 fprintf (fid, "%%%%Creator: pnmtops\n"); |
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261 fprintf (fid, "%%%%Title: %s\n", filename); |
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262 fprintf (fid, "%%%%Pages: 1\n"); |
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263 fprintf (fid, "%%%%BoundingBox: %d %d %d %d\n", |
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264 fix (llx), fix (lly), fix (urx), fix (ury)); |
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265 fprintf (fid, "%%%%EndComments\n" ); |
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266 fprintf (fid, "/readstring {\n"); |
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267 fprintf (fid, " currentfile exch readhexstring pop\n"); |
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268 fprintf (fid, "} bind def\n"); |
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269 fprintf (fid, "/picstr %d string def\n", |
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270 fix ((img_nr + padright) * bps / 8)); |
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271 fprintf (fid, "%%%%EndProlog\n"); |
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272 fprintf (fid, "%%%%Page: 1 1\n"); |
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273 fprintf (fid, "gsave\n"); |
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274 fprintf (fid, "%g %g translate\n", llx, lly); |
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275 fprintf (fid, "%g %g scale\n", scols, srows); |
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276 fprintf (fid, "%d %d %d\n", img_nr, img_nc, bps); |
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277 fprintf (fid, "[ %d 0 0 -%d 0 %d ]\n", img_nr, img_nc, img_nc); |
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278 fprintf (fid, "{ picstr readstring }\n" ); |
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279 fprintf (fid, "image\n" ); |
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280 |
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281 img = map(img); |
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282 |
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283 ## XXX FIXME XXX -- this would be much faster if fprintf knew about |
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284 ## vector arguments. |
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285 |
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286 count = 0; |
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287 for i = 1:img_sz |
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288 fprintf (fid, "%x", img (i)); |
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289 if (++count == 30) |
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290 count = 0; |
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291 fprintf (fid, "\n"); |
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292 endif |
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293 endfor |
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294 |
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295 fprintf (fid, "\n" ); |
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296 fprintf (fid, "grestore\n" ); |
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297 fprintf (fid, "showpage\n" ); |
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298 fprintf (fid, "%%%%Trailer\n" ); |
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299 fclose (fid); |
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300 |
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301 else |
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302 error ("saveimage: what happened to the image type?"); |
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303 endif |
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304 |
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305 endfunction |
