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 243 \r
 244 <h1>ImageMagick Stream Command-line Tool</h1>
 245 <p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
 246
 247 <div class="doc-section">
 248 <p><kbd>Stream</kbd> is a lightweight tool to stream one or more pixel components of the image or portion of the image to your choice of storage formats.  It writes the pixel components as they are read from the input image a row at a time making <kbd>stream</kbd> desirable when working with large images or when you require raw pixel components.</p>
 249 </div>
 250
 251 <h2><a id="usage"></a>Example Usage</h2>
 252 <div class="doc-section">
 253
 254 <p>We list a few examples of the <kbd>stream</kbd> command here to illustrate its usefulness and ease of use. To get started, lets stream the red, green, blue components of a 640x480 JPEG image to disk as unsigned characters:</p>
 255
 256 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>stream -map rgb -storage-type char image.jpg pixels.dat</span><span class='crtout'></span><span class="crtprompt"> $ </span><span class='crtin'>display -depth 8 -size 640x480 rgb:pixels.dat</span></p>
 257 <p>Here we extract a 100x100 region from a TIFF image in the grayscale format as doubles:</p>
 258
 259 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>stream -map i -storage-type double -extract 100x100+30+40 image.tif gray.raw</span></p>
 260 <p>You can also associate the region to extract with the image filename:</p>
 261
 262 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>stream -map i -storage-type double 'image.tif[100x100+30+40]' gray.raw</span></p>
 263 </div>
 264
 265 <h2><a id="options"></a>Option Summary</h2>
 266 <div class="doc-section">
 267
 268 <p>The <kbd>stream</kbd> command recognizes these options.  Click on an option to get more details about how that option works.</p>
 269
 270 <table class="doc">
 271   <tbody>
 272   <tr>
 273     <th align="left">Option</th>
 274     <th align="left">Description</th>
 275   </tr>
 276
 277   <tr>
 278     <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
 279     <td valign="top">decrypt image with this password</td>
 280   </tr>
 281
 282   <tr>
 283     <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
 284     <td valign="top">apply option to select image channels</td>
 285   </tr>
 286
 287   <tr>
 288     <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
 289     <td valign="top">set image colorspace</td>
 290   </tr>
 291
 292   <tr>
 293     <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
 294     <td valign="top">display copious debugging information</td>
 295   </tr>
 296
 297   <tr>
 298     <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
 299     <td valign="top">define one or more image format options</td>
 300   </tr>
 301
 302   <tr>
 303     <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
 304     <td valign="top">horizontal and vertical density of the image</td>
 305   </tr>
 306
 307   <tr>
 308     <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
 309     <td valign="top">image depth</td>
 310   </tr>
 311
 312   <tr>
 313     <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
 314     <td valign="top">extract area from image</td>
 315   </tr>
 316
 317   <tr>
 318     <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
 319     <td valign="top">print program options</td>
 320   </tr>
 321
 322   <tr>
 323     <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
 324     <td valign="top">type of image interlacing scheme</td>
 325   </tr>
 326
 327   <tr>
 328     <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
 329     <td valign="top">pixel color interpolation method</td>
 330   </tr>
 331
 332   <tr>
 333     <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
 334     <td valign="top">pixel cache resource limit</td>
 335   </tr>
 336
 337   <tr>
 338     <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
 339     <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
 340   </tr>
 341
 342   <tr>
 343     <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
 344     <td valign="top">format of debugging information</td>
 345   </tr>
 346
 347   <tr>
 348     <td valign="top"><a href="../www/command-line-options.html#stream-map">-map <em class="option">components</em></a></td>
 349     <td valign="top">store pixels in this format.</td>
 350   </tr>
 351
 352   <tr>
 353     <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
 354     <td valign="top">monitor progress</td>
 355   </tr>
 356
 357   <tr>
 358     <td valign="top"><a href="../www/command-line-options.html#quantize">-quantize <em class="option">colorspace</em></a></td>
 359     <td valign="top">reduce image colors in this colorspace</td>
 360   </tr>
 361
 362   <tr>
 363     <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
 364     <td valign="top">suppress all warning messages</td>
 365   </tr>
 366
 367   <tr>
 368     <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
 369     <td valign="top">pay attention to warning messages.</td>
 370   </tr>
 371
 372   <tr>
 373     <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
 374     <td valign="top">settings remain in effect until parenthesis boundary.</td>
 375   </tr>
 376
 377   <tr>
 378     <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
 379     <td valign="top">horizontal and vertical sampling factor</td>
 380   </tr>
 381
 382   <tr>
 383     <td valign="top"><a href="../www/command-line-options.html#seed">-seed <em class="option">value</em></a></td>
 384     <td valign="top">seed a new sequence of pseudo-random numbers</td>
 385   </tr>
 386
 387   <tr>
 388     <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
 389     <td valign="top">set an image attribute</td>
 390   </tr>
 391
 392   <tr>
 393     <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
 394     <td valign="top">width and height of image</td>
 395   </tr>
 396
 397   <tr>
 398     <td valign="top"><a href="../www/command-line-options.html#storage-type">-storage-type <em class="option">type</em></a></td>
 399     <td valign="top">store pixels with this storage type.</td>
 400   </tr>
 401
 402   <tr>
 403     <td valign="top"><a href="../www/command-line-options.html#synchronize">-synchronize</a></td>
 404     <td valign="top">synchronize image to storage device</td>
 405   </tr>
 406
 407   <tr>
 408     <td valign="top"><a href="../www/command-line-options.html#taint">-taint</a></td>
 409     <td valign="top">mark the image as modified</td>
 410   </tr>
 411
 412   <tr>
 413     <td valign="top"><a href="../www/command-line-options.html#transparent-color">-transparent-color <em class="option">color</em></a></td>
 414     <td valign="top">transparent color</td>
 415   </tr>
 416
 417   <tr>
 418     <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
 419     <td valign="top">print detailed information about the image</td>
 420   </tr>
 421
 422   <tr>
 423     <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
 424     <td valign="top">print version information</td>
 425   </tr>
 426
 427   <tr>
 428     <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
 429     <td valign="top">access method for pixels outside the boundaries of the image</td>
 430   </tr>
 431
 432   </tbody>
 433 </table>
 434
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