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177
cristy307ba182010-12-25 01:00:34 +0000178<h1>Module transform
179 Methods</h1>
cristyf1196bb2010-02-13 21:18:03 +0000180<p class="navigation-index">[<a href="#ChopImage">ChopImage</a> &bull; <a href="#CropImage">CropImage</a> &bull; <a href="#ExcerptImage">ExcerptImage</a> &bull; <a href="#ExtentImage">ExtentImage</a> &bull; <a href="#FlipImage">FlipImage</a> &bull; <a href="#FlopImage">FlopImage</a> &bull; <a href="#RollImage">RollImage</a> &bull; <a href="#ShaveImage">ShaveImage</a> &bull; <a href="#SpliceImage">SpliceImage</a> &bull; <a href="#TransformImage">TransformImage</a> &bull; <a href="#TransformImages">TransformImages</a> &bull; <a href="#TransposeImage">TransposeImage</a> &bull; <a href="#TransverseImage">TransverseImage</a> &bull; <a href="#TrimImage">TrimImage</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000181
cristy7a40ba82011-01-08 20:31:18 +0000182<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
183_8c.html" id="ChopImage">ChopImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000184<div class="doc-section">
185
cristy7a40ba82011-01-08 20:31:18 +0000186<p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p>
cristy3ed852e2009-09-05 21:47:34 +0000187
188<p>The format of the ChopImage method is:</p>
189
190<pre class="code">
191 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
192 ExceptionInfo *exception)
193</pre>
194
cristy7a40ba82011-01-08 20:31:18 +0000195<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000196
197<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000198<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000199
200<h5>chop_info</h5>
cristy7a40ba82011-01-08 20:31:18 +0000201<p>Define the region of the image to chop.</p>
cristy3ed852e2009-09-05 21:47:34 +0000202
203<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000204<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000205
206 </div>
cristy7a40ba82011-01-08 20:31:18 +0000207<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
208_8c.html" id="CropImage">CropImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000209<div class="doc-section">
210
cristy7a40ba82011-01-08 20:31:18 +0000211<p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p>
cristy3ed852e2009-09-05 21:47:34 +0000212
213<p>The format of the CropImage method is:</p>
214
215<pre class="code">
216 Image *CropImage(const Image *image,const RectangleInfo *geometry,
217 ExceptionInfo *exception)
218</pre>
219
cristy7a40ba82011-01-08 20:31:18 +0000220<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000221
222<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000223<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000224
225<h5>geometry</h5>
cristy7a40ba82011-01-08 20:31:18 +0000226<p>Define the region of the image to crop with members x, y, width, and height.</p>
cristy3ed852e2009-09-05 21:47:34 +0000227
228<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000229<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000230
231 </div>
cristy7a40ba82011-01-08 20:31:18 +0000232<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
233_8c.html" id="ExcerptImage">ExcerptImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000234<div class="doc-section">
235
cristy7a40ba82011-01-08 20:31:18 +0000236<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p>
cristy3ed852e2009-09-05 21:47:34 +0000237
238<p>The format of the ExcerptImage method is:</p>
239
240<pre class="code">
241 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
242 ExceptionInfo *exception)
243</pre>
244
cristy7a40ba82011-01-08 20:31:18 +0000245<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000246
247<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000248<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000249
250<h5>geometry</h5>
cristy7a40ba82011-01-08 20:31:18 +0000251<p>Define the region of the image to extend with members x, y, width, and height.</p>
cristy3ed852e2009-09-05 21:47:34 +0000252
253<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000254<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000255
256 </div>
cristy7a40ba82011-01-08 20:31:18 +0000257<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
258_8c.html" id="ExtentImage">ExtentImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000259<div class="doc-section">
260
cristy7a40ba82011-01-08 20:31:18 +0000261<p>ExtentImage() extends the image as defined by the geometry, gravity, and image background color. Set the (x,y) offset of the geometry to move the original image relative to the extended image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000262
263<p>The format of the ExtentImage method is:</p>
264
265<pre class="code">
266 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
267 ExceptionInfo *exception)
268</pre>
269
cristy7a40ba82011-01-08 20:31:18 +0000270<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000271
272<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000273<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000274
275<h5>geometry</h5>
cristy7a40ba82011-01-08 20:31:18 +0000276<p>Define the region of the image to extend with members x, y, width, and height.</p>
cristy3ed852e2009-09-05 21:47:34 +0000277
278<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000279<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000280
281 </div>
cristy7a40ba82011-01-08 20:31:18 +0000282<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
283_8c.html" id="FlipImage">FlipImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000284<div class="doc-section">
285
cristy7a40ba82011-01-08 20:31:18 +0000286<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p>
cristy3ed852e2009-09-05 21:47:34 +0000287
288<p>The format of the FlipImage method is:</p>
289
290<pre class="code">
291 Image *FlipImage(const Image *image,ExceptionInfo *exception)
292</pre>
293
cristy7a40ba82011-01-08 20:31:18 +0000294<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000295
296<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000297<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000298
299<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000300<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000301
302 </div>
cristy7a40ba82011-01-08 20:31:18 +0000303<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
304_8c.html" id="FlopImage">FlopImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000305<div class="doc-section">
306
cristy7a40ba82011-01-08 20:31:18 +0000307<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p>
cristy3ed852e2009-09-05 21:47:34 +0000308
309<p>The format of the FlopImage method is:</p>
310
311<pre class="code">
312 Image *FlopImage(const Image *image,ExceptionInfo *exception)
313</pre>
314
cristy7a40ba82011-01-08 20:31:18 +0000315<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000316
317<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000318<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000319
320<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000321<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000322
323 </div>
cristy7a40ba82011-01-08 20:31:18 +0000324<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
325_8c.html" id="RollImage">RollImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000326<div class="doc-section">
327
cristy7a40ba82011-01-08 20:31:18 +0000328<p>RollImage() offsets an image as defined by x_offset and y_offset.</p>
cristy3ed852e2009-09-05 21:47:34 +0000329
330<p>The format of the RollImage method is:</p>
331
332<pre class="code">
cristybb503372010-05-27 20:51:26 +0000333 Image *RollImage(const Image *image,const ssize_t x_offset,
334 const ssize_t y_offset,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000335</pre>
336
cristy7a40ba82011-01-08 20:31:18 +0000337<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000338
339<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000340<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000341
342<h5>x_offset</h5>
cristy7a40ba82011-01-08 20:31:18 +0000343<p>the number of columns to roll in the horizontal direction.</p>
cristy3ed852e2009-09-05 21:47:34 +0000344
345<h5>y_offset</h5>
cristy7a40ba82011-01-08 20:31:18 +0000346<p>the number of rows to roll in the vertical direction.</p>
cristy3ed852e2009-09-05 21:47:34 +0000347
348<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000349<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000350
351 </div>
cristy7a40ba82011-01-08 20:31:18 +0000352<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
353_8c.html" id="ShaveImage">ShaveImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000354<div class="doc-section">
355
cristy7a40ba82011-01-08 20:31:18 +0000356<p>ShaveImage() shaves pixels from the image edges. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000357
358<p>The format of the ShaveImage method is:</p>
359
360<pre class="code">
361 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
362 ExceptionInfo *exception)
363</pre>
364
cristy7a40ba82011-01-08 20:31:18 +0000365<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000366
367<h5>shave_image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000368<p>Method ShaveImage returns a pointer to the shaved image. A null image is returned if there is a memory shortage or if the image width or height is zero.</p>
cristy3ed852e2009-09-05 21:47:34 +0000369
370<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000371<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000372
373<h5>shave_info</h5>
cristy7a40ba82011-01-08 20:31:18 +0000374<p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p>
cristy3ed852e2009-09-05 21:47:34 +0000375
376<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000377<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000378
379 </div>
cristy7a40ba82011-01-08 20:31:18 +0000380<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
381_8c.html" id="SpliceImage">SpliceImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000382<div class="doc-section">
383
cristy7a40ba82011-01-08 20:31:18 +0000384<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p>
cristy3ed852e2009-09-05 21:47:34 +0000385
386<p>The format of the SpliceImage method is:</p>
387
388<pre class="code">
389 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
390 ExceptionInfo *exception)
391</pre>
392
cristy7a40ba82011-01-08 20:31:18 +0000393<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000394
395<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000396<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000397
398<h5>geometry</h5>
cristy7a40ba82011-01-08 20:31:18 +0000399<p>Define the region of the image to splice with members x, y, width, and height.</p>
cristy3ed852e2009-09-05 21:47:34 +0000400
401<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000402<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000403
404 </div>
cristy7a40ba82011-01-08 20:31:18 +0000405<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
406_8c.html" id="TransformImage">TransformImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000407<div class="doc-section">
408
cristy7a40ba82011-01-08 20:31:18 +0000409<p>TransformImage() is a convenience method that behaves like ResizeImage() or CropImage() but accepts scaling and/or cropping information as a region geometry specification. If the operation fails, the original image handle is returned.</p>
cristy3ed852e2009-09-05 21:47:34 +0000410
411<p>The format of the TransformImage method is:</p>
412
413<pre class="code">
414 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
415 const char *image_geometry)
416</pre>
417
cristy7a40ba82011-01-08 20:31:18 +0000418<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000419
420<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000421<p>the image The transformed image is returned as this parameter.</p>
cristy3ed852e2009-09-05 21:47:34 +0000422
423<h5>crop_geometry</h5>
cristy7a40ba82011-01-08 20:31:18 +0000424<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
cristy3ed852e2009-09-05 21:47:34 +0000425
426<h5>image_geometry</h5>
cristy7a40ba82011-01-08 20:31:18 +0000427<p>An image geometry string. This geometry defines the final size of the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000428
429 </div>
cristy7a40ba82011-01-08 20:31:18 +0000430<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
431_8c.html" id="TransformImages">TransformImages</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000432<div class="doc-section">
433
cristy7a40ba82011-01-08 20:31:18 +0000434<p>TransformImages() calls TransformImage() on each image of a sequence.</p>
cristy3ed852e2009-09-05 21:47:34 +0000435
436<p>The format of the TransformImage method is:</p>
437
438<pre class="code">
439 MagickBooleanType TransformImages(Image **image,
440 const char *crop_geometry,const char *image_geometry)
441</pre>
442
cristy7a40ba82011-01-08 20:31:18 +0000443<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000444
445<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000446<p>the image The transformed image is returned as this parameter.</p>
cristy3ed852e2009-09-05 21:47:34 +0000447
448<h5>crop_geometry</h5>
cristy7a40ba82011-01-08 20:31:18 +0000449<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
cristy3ed852e2009-09-05 21:47:34 +0000450
451<h5>image_geometry</h5>
cristy7a40ba82011-01-08 20:31:18 +0000452<p>An image geometry string. This geometry defines the final size of the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000453
454 </div>
cristy7a40ba82011-01-08 20:31:18 +0000455<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
456_8c.html" id="TransposeImage">TransposeImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000457<div class="doc-section">
458
cristy7a40ba82011-01-08 20:31:18 +0000459<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p>
cristy3ed852e2009-09-05 21:47:34 +0000460
461<p>The format of the TransposeImage method is:</p>
462
463<pre class="code">
464 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
465</pre>
466
cristy7a40ba82011-01-08 20:31:18 +0000467<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000468
469<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000470<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000471
472<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000473<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000474
475 </div>
cristy7a40ba82011-01-08 20:31:18 +0000476<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
477_8c.html" id="TransverseImage">TransverseImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000478<div class="doc-section">
479
cristy7a40ba82011-01-08 20:31:18 +0000480<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p>
cristy3ed852e2009-09-05 21:47:34 +0000481
482<p>The format of the TransverseImage method is:</p>
483
484<pre class="code">
485 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
486</pre>
487
cristy7a40ba82011-01-08 20:31:18 +0000488<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000489
490<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000491<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000492
493<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000494<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000495
496 </div>
cristy7a40ba82011-01-08 20:31:18 +0000497<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/transform
498_8c.html" id="TrimImage">TrimImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000499<div class="doc-section">
500
cristy7a40ba82011-01-08 20:31:18 +0000501<p>TrimImage() trims pixels from the image edges. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000502
503<p>The format of the TrimImage method is:</p>
504
505<pre class="code">
506 Image *TrimImage(const Image *image,ExceptionInfo *exception)
507</pre>
508
cristy7a40ba82011-01-08 20:31:18 +0000509<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000510
511<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000512<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000513
514<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000515<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000516
517 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000518
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