[2] | 1 | ;+ |
---|
| 2 | ; |
---|
[136] | 3 | ; @file_comments |
---|
[133] | 4 | ; Show the contents of a graphics file in the current window. |
---|
[2] | 5 | ; |
---|
| 6 | ; The input formats supported are: |
---|
| 7 | ; GIF 8-bit with color table, |
---|
| 8 | ; BMP 8-bit with color table or 24-bit true-color, |
---|
| 9 | ; PICT 8-bit with color table, |
---|
| 10 | ; TIFF 8-bit with color table or 24-bit true-color, |
---|
| 11 | ; JPEG 24-bit true color, |
---|
| 12 | ; |
---|
[186] | 13 | ; Any conversions necessary to translate 8-bit or 24-bit files |
---|
| 14 | ; to 8-bit or 24-bit images on-screen are done automatically. |
---|
[2] | 15 | ; |
---|
[325] | 16 | ; @categories |
---|
| 17 | ; Input/Output |
---|
[2] | 18 | ; |
---|
[136] | 19 | ; @param FILE {in}{required} |
---|
| 20 | ; Name of the output file (format is identified automatically). |
---|
[2] | 21 | ; |
---|
[163] | 22 | ; @keyword DITHER {default=no dithering} |
---|
[136] | 23 | ; Set this keyword to dither the input image when displaying |
---|
[163] | 24 | ; 24-bit images on an 8-bit display. |
---|
[2] | 25 | ; |
---|
[136] | 26 | ; @keyword CURRENT |
---|
| 27 | ; Set this keyword to display the image in the current window |
---|
| 28 | ; (default is to create a new window sized to fit the image). |
---|
[2] | 29 | ; |
---|
[136] | 30 | ; @restrictions |
---|
| 31 | ; The color table is modified. |
---|
[2] | 32 | ; |
---|
[136] | 33 | ; @restrictions |
---|
| 34 | ; Requires IDL 5.2 or higher (image QUERY functions). |
---|
[2] | 35 | ; |
---|
[186] | 36 | ; @examples |
---|
[136] | 37 | ; |
---|
[371] | 38 | ; IDL> showimage, filepath('rose.jpg', subdir='examples/data') |
---|
| 39 | ; |
---|
[230] | 40 | ; @history |
---|
| 41 | ; Liam.Gumley\@ssec.wisc.edu |
---|
[232] | 42 | ; <a href="http://cimss.ssec.wisc.edu/~gumley/"/> |
---|
[69] | 43 | ; |
---|
| 44 | ; This program is free software; you can redistribute it and/or |
---|
| 45 | ; modify it under the terms of the GNU General Public License |
---|
| 46 | ; as published by the Free Software Foundation; either version 2 |
---|
| 47 | ; of the License, or (at your option) any later version. |
---|
| 48 | ; |
---|
| 49 | ; This program is distributed in the hope that it will be useful, |
---|
| 50 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
| 51 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
| 52 | ; GNU General Public License for more details. |
---|
| 53 | ; |
---|
| 54 | ; You should have received a copy of the GNU General Public License |
---|
| 55 | ; along with this program; if not, write to the Free Software |
---|
| 56 | ; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
---|
[133] | 57 | ; |
---|
[230] | 58 | ; @version |
---|
| 59 | ; $Id$ |
---|
[133] | 60 | ; |
---|
[2] | 61 | ;- |
---|
[163] | 62 | PRO showimage, FILE, DITHER=DITHER, CURRENT=CURRENT |
---|
[133] | 63 | ; |
---|
| 64 | compile_opt idl2, strictarrsubs |
---|
| 65 | ; |
---|
[69] | 66 | rcs_id = '$Id$' |
---|
| 67 | |
---|
[2] | 68 | ;------------------------------------------------------------------------------- |
---|
| 69 | ;- CHECK INPUT |
---|
| 70 | ;------------------------------------------------------------------------------- |
---|
| 71 | |
---|
| 72 | ;- Check IDL version |
---|
| 73 | |
---|
| 74 | if float(!version.release) lt 5.2 then begin |
---|
| 75 | message, 'IDL 5.2 or higher is required', /continue |
---|
| 76 | return |
---|
| 77 | endif |
---|
| 78 | |
---|
| 79 | ;- Check input arguments |
---|
| 80 | |
---|
| 81 | case 1 of |
---|
| 82 | n_params() ne 1 : error = 'Usage: SHOWIMAGE, FILE' |
---|
| 83 | n_elements(file) eq 0 : error = 'Argument FILE is undefined' |
---|
| 84 | n_elements(file) gt 1 : error = 'Argument FILE must be a scalar string' |
---|
| 85 | (findfile(file))[0] eq '' : error = 'Argument FILE was not found' |
---|
| 86 | else : error = '' |
---|
| 87 | endcase |
---|
| 88 | |
---|
| 89 | if error ne '' then begin |
---|
| 90 | message, error, /continue |
---|
| 91 | return |
---|
| 92 | endif |
---|
| 93 | |
---|
| 94 | ;------------------------------------------------------------------------------- |
---|
| 95 | ;- CHECK THE GRAPHICS DEVICE |
---|
| 96 | ;------------------------------------------------------------------------------- |
---|
| 97 | |
---|
| 98 | ;- Check for device supporting windows and tvrd() |
---|
| 99 | |
---|
| 100 | if ((!d.flags and 256) eq 0) or ((!d.flags and 128) eq 0) then begin |
---|
| 101 | error = string(!d.name, format='("Graphics device (",a,") is not supported")') |
---|
| 102 | message, error, /continue |
---|
| 103 | return |
---|
| 104 | endif |
---|
| 105 | |
---|
| 106 | ;- Make sure a window has been opened in this session and get visual depth |
---|
| 107 | |
---|
| 108 | if !d.window lt 0 then begin |
---|
| 109 | window, /free, /pixmap, xsize=20, ysize=20 |
---|
| 110 | wdelete, !d.window |
---|
| 111 | endif |
---|
| 112 | device, get_visual_depth=depth |
---|
| 113 | |
---|
| 114 | ;- If 8-bit display is low on colors, print a message |
---|
| 115 | |
---|
| 116 | if (depth eq 8) and (!d.table_size) lt 64 then message, $ |
---|
| 117 | 'Display has less than 64 colors; image quality may degrade', /continue |
---|
| 118 | |
---|
| 119 | ;------------------------------------------------------------------------------- |
---|
| 120 | ;- IDENTIFY FILE AND READ IMAGE |
---|
| 121 | ;------------------------------------------------------------------------------- |
---|
| 122 | |
---|
| 123 | ;- Identify the file format |
---|
| 124 | |
---|
| 125 | result = query_gif(file, info) |
---|
| 126 | if result eq 0 then result = query_bmp(file, info) |
---|
| 127 | if result eq 0 then result = query_pict(file, info) |
---|
| 128 | if result eq 0 then result = query_tiff(file, info) |
---|
| 129 | if result eq 0 then result = query_jpeg(file, info) |
---|
| 130 | if result eq 0 then begin |
---|
| 131 | message, 'File format not recognized', /continue |
---|
| 132 | return |
---|
| 133 | endif |
---|
| 134 | |
---|
| 135 | ;- Fix the channel information for GIF images |
---|
| 136 | |
---|
| 137 | if info.type eq 'GIF' then info.channels = 1 |
---|
| 138 | |
---|
| 139 | ;- Read the image |
---|
| 140 | |
---|
| 141 | case info.type of |
---|
| 142 | |
---|
| 143 | 'GIF' : read_gif, file, image, r, g, b |
---|
| 144 | |
---|
| 145 | 'BMP' : begin |
---|
| 146 | if info.channels eq 1 then begin |
---|
| 147 | image = read_bmp(file, r, g, b) |
---|
| 148 | endif else begin |
---|
| 149 | image = read_bmp(file) |
---|
| 150 | image = reverse(temporary(image), 1) |
---|
| 151 | endelse |
---|
| 152 | end |
---|
| 153 | |
---|
| 154 | 'PICT' : read_pict, file, image, r, g, b |
---|
| 155 | |
---|
| 156 | 'TIFF' : begin |
---|
| 157 | if info.channels eq 1 then begin |
---|
| 158 | image = read_tiff(file, r, g, b, order=order) |
---|
| 159 | image = reverse(temporary(image), 2) |
---|
| 160 | endif else begin |
---|
| 161 | image = read_tiff(file, order=order) |
---|
| 162 | image = reverse(temporary(image), 3) |
---|
| 163 | endelse |
---|
| 164 | end |
---|
| 165 | |
---|
| 166 | 'JPEG' : read_jpeg, file, image |
---|
| 167 | |
---|
| 168 | endcase |
---|
| 169 | |
---|
| 170 | ;- If an 8-bit image was read, reduce the number of colors |
---|
| 171 | |
---|
| 172 | if info.channels eq 1 then begin |
---|
| 173 | reduce_colors, image, index |
---|
| 174 | r = r[index] |
---|
| 175 | g = g[index] |
---|
| 176 | b = b[index] |
---|
| 177 | endif |
---|
| 178 | |
---|
| 179 | ;- Get image size |
---|
| 180 | |
---|
| 181 | dims = size(image, /dimensions) |
---|
| 182 | if n_elements(dims) eq 2 then begin |
---|
| 183 | nx = dims[0] |
---|
| 184 | ny = dims[1] |
---|
| 185 | endif else begin |
---|
| 186 | nx = dims[1] |
---|
| 187 | ny = dims[2] |
---|
| 188 | endelse |
---|
| 189 | |
---|
| 190 | ;------------------------------------------------------------------------------- |
---|
| 191 | ;- CREATE A WINDOW |
---|
| 192 | ;------------------------------------------------------------------------------- |
---|
| 193 | |
---|
| 194 | ;- Create a draw widget sized to fit the image |
---|
| 195 | |
---|
| 196 | if not keyword_set(current) then begin |
---|
| 197 | |
---|
| 198 | ;- Set default window size |
---|
| 199 | |
---|
| 200 | scroll = 0 |
---|
| 201 | xsize = nx |
---|
| 202 | ysize = ny |
---|
| 203 | draw_xsize = nx |
---|
| 204 | draw_ysize = ny |
---|
| 205 | |
---|
| 206 | ;- Adjust the window size if the image is too large |
---|
| 207 | |
---|
| 208 | device, get_screen_size=screen |
---|
[69] | 209 | screen_xsize = screen[0] |
---|
| 210 | screen_ysize = screen[1] |
---|
| 211 | if (nx gt screen_xsize) then begin |
---|
| 212 | xsize = 0.9 * screen_xsize |
---|
[2] | 213 | scroll = 1 |
---|
| 214 | endif |
---|
[69] | 215 | if (ny gt screen_ysize) then begin |
---|
| 216 | ysize = 0.9 * screen_ysize |
---|
[2] | 217 | scroll = 1 |
---|
| 218 | endif |
---|
| 219 | |
---|
| 220 | ;- Create the draw widget |
---|
| 221 | |
---|
| 222 | base = widget_base(title=file) |
---|
| 223 | draw = widget_draw(base, scroll=scroll) |
---|
| 224 | widget_control, draw, xsize=xsize, ysize=ysize, $ |
---|
| 225 | draw_xsize=draw_xsize, draw_ysize=draw_ysize |
---|
| 226 | |
---|
| 227 | endif |
---|
| 228 | |
---|
| 229 | ;------------------------------------------------------------------------------- |
---|
| 230 | ;- HANDLE IDL 8-BIT MODE |
---|
| 231 | ;------------------------------------------------------------------------------- |
---|
| 232 | |
---|
| 233 | if depth eq 8 then begin |
---|
| 234 | |
---|
| 235 | ;- If the color table of an 8-bit image is larger than |
---|
| 236 | ;- the current display table, convert the image to 24-bit |
---|
| 237 | |
---|
| 238 | if (info.channels eq 1) and (n_elements(r) gt !d.table_size) then begin |
---|
| 239 | |
---|
| 240 | ;- Convert to 24-bit |
---|
| 241 | |
---|
| 242 | dims = size(image, /dimensions) |
---|
| 243 | nx = dims[0] |
---|
| 244 | ny = dims[1] |
---|
| 245 | true = bytarr(3, nx, ny) |
---|
| 246 | true[0, *, *] = r[image] |
---|
| 247 | true[1, *, *] = g[image] |
---|
| 248 | true[2, *, *] = b[image] |
---|
| 249 | image = temporary(true) |
---|
| 250 | |
---|
| 251 | ;- Reset the number of channels |
---|
| 252 | |
---|
| 253 | info.channels = 3 |
---|
| 254 | |
---|
| 255 | endif |
---|
| 256 | |
---|
| 257 | ;- If image is 24-bit, convert to 8-bit |
---|
| 258 | |
---|
| 259 | if info.channels eq 3 then begin |
---|
| 260 | |
---|
| 261 | ;- Convert 24-bit image to 8-bit |
---|
| 262 | |
---|
| 263 | image = color_quan(image, 1, r, g, b, colors=!d.table_size, $ |
---|
| 264 | dither=keyword_set(dither)) |
---|
| 265 | |
---|
| 266 | ;- Sort the color table from darkest to brightest |
---|
| 267 | |
---|
| 268 | table_sum = total([[long(r)], [long(g)], [long(b)]], 2) |
---|
| 269 | table_index = sort(table_sum) |
---|
| 270 | image_index = sort(table_index) |
---|
| 271 | r = r[table_index] |
---|
| 272 | g = g[table_index] |
---|
| 273 | b = b[table_index] |
---|
| 274 | oldimage = image |
---|
| 275 | image[*] = image_index[temporary(oldimage)] |
---|
| 276 | |
---|
| 277 | ;- Reset the number of channels |
---|
| 278 | |
---|
| 279 | info.channels = 1 |
---|
| 280 | |
---|
| 281 | endif |
---|
| 282 | |
---|
| 283 | endif |
---|
| 284 | |
---|
| 285 | ;------------------------------------------------------------------------------- |
---|
| 286 | ;- DISPLAY THE IMAGE |
---|
| 287 | ;------------------------------------------------------------------------------- |
---|
| 288 | |
---|
| 289 | ;- Realize the draw widget |
---|
| 290 | |
---|
| 291 | if not keyword_set(current) then widget_control, base, /realize |
---|
| 292 | |
---|
| 293 | ;- Save current decomposed mode and display order |
---|
| 294 | |
---|
| 295 | device, get_decomposed=current_decomposed |
---|
| 296 | current_order = !order |
---|
| 297 | |
---|
| 298 | ;- Set image to display from bottom up |
---|
| 299 | |
---|
| 300 | !order = 0 |
---|
| 301 | |
---|
| 302 | ;- Display the image |
---|
| 303 | |
---|
| 304 | if info.channels eq 1 then begin |
---|
| 305 | |
---|
| 306 | device, decomposed=0 |
---|
| 307 | tvlct, r, g, b |
---|
| 308 | tv, image |
---|
| 309 | |
---|
| 310 | endif else begin |
---|
| 311 | |
---|
| 312 | device, decomposed=1 |
---|
| 313 | tv, image, true=1 |
---|
| 314 | |
---|
| 315 | endelse |
---|
| 316 | |
---|
| 317 | ;- Restore decomposed mode and display order |
---|
| 318 | |
---|
| 319 | device, decomposed=current_decomposed |
---|
| 320 | !order = current_order |
---|
| 321 | |
---|
| 322 | END |
---|