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191<div class="main">
192
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]193<h1>Module transform Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]194<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 +0000[diff] [blame]195
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]196<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ChopImage">ChopImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]197<div class="doc-section">
198
199<p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p>
200
201<p>The format of the ChopImage method is:</p>
202
203<pre class="code">
204 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
205 ExceptionInfo *exception)
206</pre>
207
208<p>A description of each parameter follows:</p>
209
210<h5>image</h5>
211<p>the image.</p>
212
213<h5>chop_info</h5>
214<p>Define the region of the image to chop.</p>
215
216<h5>exception</h5>
217<p>return any errors or warnings in this structure.</p>
218
219 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]220<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="CropImage">CropImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]221<div class="doc-section">
222
223<p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p>
224
225<p>The format of the CropImage method is:</p>
226
227<pre class="code">
228 Image *CropImage(const Image *image,const RectangleInfo *geometry,
229 ExceptionInfo *exception)
230</pre>
231
232<p>A description of each parameter follows:</p>
233
234<h5>image</h5>
235<p>the image.</p>
236
237<h5>geometry</h5>
238<p>Define the region of the image to crop with members x, y, width, and height.</p>
239
240<h5>exception</h5>
241<p>return any errors or warnings in this structure.</p>
242
243 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]244<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExcerptImage">ExcerptImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]245<div class="doc-section">
246
247<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p>
248
249<p>The format of the ExcerptImage method is:</p>
250
251<pre class="code">
252 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
253 ExceptionInfo *exception)
254</pre>
255
256<p>A description of each parameter follows:</p>
257
258<h5>image</h5>
259<p>the image.</p>
260
261<h5>geometry</h5>
262<p>Define the region of the image to extend with members x, y, width, and height.</p>
263
264<h5>exception</h5>
265<p>return any errors or warnings in this structure.</p>
266
267 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]268<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExtentImage">ExtentImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]269<div class="doc-section">
270
271<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>
272
273<p>The format of the ExtentImage method is:</p>
274
275<pre class="code">
276 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
277 ExceptionInfo *exception)
278</pre>
279
280<p>A description of each parameter follows:</p>
281
282<h5>image</h5>
283<p>the image.</p>
284
285<h5>geometry</h5>
286<p>Define the region of the image to extend with members x, y, width, and height.</p>
287
288<h5>exception</h5>
289<p>return any errors or warnings in this structure.</p>
290
291 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]292<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlipImage">FlipImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]293<div class="doc-section">
294
295<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p>
296
297<p>The format of the FlipImage method is:</p>
298
299<pre class="code">
300 Image *FlipImage(const Image *image,ExceptionInfo *exception)
301</pre>
302
303<p>A description of each parameter follows:</p>
304
305<h5>image</h5>
306<p>the image.</p>
307
308<h5>exception</h5>
309<p>return any errors or warnings in this structure.</p>
310
311 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]312<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlopImage">FlopImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]313<div class="doc-section">
314
315<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p>
316
317<p>The format of the FlopImage method is:</p>
318
319<pre class="code">
320 Image *FlopImage(const Image *image,ExceptionInfo *exception)
321</pre>
322
323<p>A description of each parameter follows:</p>
324
325<h5>image</h5>
326<p>the image.</p>
327
328<h5>exception</h5>
329<p>return any errors or warnings in this structure.</p>
330
331 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]332<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="RollImage">RollImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]333<div class="doc-section">
334
335<p>RollImage() offsets an image as defined by x_offset and y_offset.</p>
336
337<p>The format of the RollImage method is:</p>
338
339<pre class="code">
340 Image *RollImage(const Image *image,const ssize_t x_offset,
341 const ssize_t y_offset,ExceptionInfo *exception)
342</pre>
343
344<p>A description of each parameter follows:</p>
345
346<h5>image</h5>
347<p>the image.</p>
348
349<h5>x_offset</h5>
350<p>the number of columns to roll in the horizontal direction.</p>
351
352<h5>y_offset</h5>
353<p>the number of rows to roll in the vertical direction.</p>
354
355<h5>exception</h5>
356<p>return any errors or warnings in this structure.</p>
357
358 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]359<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ShaveImage">ShaveImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]360<div class="doc-section">
361
362<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>
363
364<p>The format of the ShaveImage method is:</p>
365
366<pre class="code">
367 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
368 ExceptionInfo *exception)
369</pre>
370
371<p>A description of each parameter follows:</p>
372
373<h5>shave_image</h5>
374<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>
375
376<h5>image</h5>
377<p>the image.</p>
378
379<h5>shave_info</h5>
380<p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p>
381
382<h5>exception</h5>
383<p>return any errors or warnings in this structure.</p>
384
385 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]386<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="SpliceImage">SpliceImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]387<div class="doc-section">
388
389<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p>
390
391<p>The format of the SpliceImage method is:</p>
392
393<pre class="code">
394 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
395 ExceptionInfo *exception)
396</pre>
397
398<p>A description of each parameter follows:</p>
399
400<h5>image</h5>
401<p>the image.</p>
402
403<h5>geometry</h5>
404<p>Define the region of the image to splice with members x, y, width, and height.</p>
405
406<h5>exception</h5>
407<p>return any errors or warnings in this structure.</p>
408
409 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]410<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImage">TransformImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]411<div class="doc-section">
412
413<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>
414
415<p>The format of the TransformImage method is:</p>
416
417<pre class="code">
418 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
419 const char *image_geometry)
420</pre>
421
422<p>A description of each parameter follows:</p>
423
424<h5>image</h5>
425<p>the image The transformed image is returned as this parameter.</p>
426
427<h5>crop_geometry</h5>
428<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
429
430<h5>image_geometry</h5>
431<p>An image geometry string. This geometry defines the final size of the image.</p>
432
433 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]434<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImages">TransformImages</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]435<div class="doc-section">
436
437<p>TransformImages() calls TransformImage() on each image of a sequence.</p>
438
439<p>The format of the TransformImage method is:</p>
440
441<pre class="code">
442 MagickBooleanType TransformImages(Image **image,
443 const char *crop_geometry,const char *image_geometry)
444</pre>
445
446<p>A description of each parameter follows:</p>
447
448<h5>image</h5>
449<p>the image The transformed image is returned as this parameter.</p>
450
451<h5>crop_geometry</h5>
452<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
453
454<h5>image_geometry</h5>
455<p>An image geometry string. This geometry defines the final size of the image.</p>
456
457 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]458<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransposeImage">TransposeImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]459<div class="doc-section">
460
461<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p>
462
463<p>The format of the TransposeImage method is:</p>
464
465<pre class="code">
466 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
467</pre>
468
469<p>A description of each parameter follows:</p>
470
471<h5>image</h5>
472<p>the image.</p>
473
474<h5>exception</h5>
475<p>return any errors or warnings in this structure.</p>
476
477 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]478<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransverseImage">TransverseImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]479<div class="doc-section">
480
481<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p>
482
483<p>The format of the TransverseImage method is:</p>
484
485<pre class="code">
486 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
487</pre>
488
489<p>A description of each parameter follows:</p>
490
491<h5>image</h5>
492<p>the image.</p>
493
494<h5>exception</h5>
495<p>return any errors or warnings in this structure.</p>
496
497 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame^]498<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TrimImage">TrimImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]499<div class="doc-section">
500
501<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>
502
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
509<p>A description of each parameter follows:</p>
510
511<h5>image</h5>
512<p>the image.</p>
513
514<h5>exception</h5>
515<p>return any errors or warnings in this structure.</p>
516
517 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]518
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