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197<div class="main">
198
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]199<h1>Module transform Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]200<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]201
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]202<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]203<div class="doc-section">
204
205<p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p>
206
207<p>The format of the ChopImage method is:</p>
208
209<pre class="code">
210 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
211 ExceptionInfo *exception)
212</pre>
213
214<p>A description of each parameter follows:</p>
215
216<h5>image</h5>
217<p>the image.</p>
218
219<h5>chop_info</h5>
220<p>Define the region of the image to chop.</p>
221
222<h5>exception</h5>
223<p>return any errors or warnings in this structure.</p>
224
225 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]226<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]227<div class="doc-section">
228
229<p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p>
230
231<p>The format of the CropImage method is:</p>
232
233<pre class="code">
234 Image *CropImage(const Image *image,const RectangleInfo *geometry,
235 ExceptionInfo *exception)
236</pre>
237
238<p>A description of each parameter follows:</p>
239
240<h5>image</h5>
241<p>the image.</p>
242
243<h5>geometry</h5>
244<p>Define the region of the image to crop with members x, y, width, and height.</p>
245
246<h5>exception</h5>
247<p>return any errors or warnings in this structure.</p>
248
249 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]250<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]251<div class="doc-section">
252
253<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p>
254
255<p>The format of the ExcerptImage method is:</p>
256
257<pre class="code">
258 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
259 ExceptionInfo *exception)
260</pre>
261
262<p>A description of each parameter follows:</p>
263
264<h5>image</h5>
265<p>the image.</p>
266
267<h5>geometry</h5>
268<p>Define the region of the image to extend with members x, y, width, and height.</p>
269
270<h5>exception</h5>
271<p>return any errors or warnings in this structure.</p>
272
273 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]274<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]275<div class="doc-section">
276
277<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>
278
279<p>The format of the ExtentImage method is:</p>
280
281<pre class="code">
282 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
283 ExceptionInfo *exception)
284</pre>
285
286<p>A description of each parameter follows:</p>
287
288<h5>image</h5>
289<p>the image.</p>
290
291<h5>geometry</h5>
292<p>Define the region of the image to extend with members x, y, width, and height.</p>
293
294<h5>exception</h5>
295<p>return any errors or warnings in this structure.</p>
296
297 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]298<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]299<div class="doc-section">
300
301<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p>
302
303<p>The format of the FlipImage method is:</p>
304
305<pre class="code">
306 Image *FlipImage(const Image *image,ExceptionInfo *exception)
307</pre>
308
309<p>A description of each parameter follows:</p>
310
311<h5>image</h5>
312<p>the image.</p>
313
314<h5>exception</h5>
315<p>return any errors or warnings in this structure.</p>
316
317 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]318<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]319<div class="doc-section">
320
321<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p>
322
323<p>The format of the FlopImage method is:</p>
324
325<pre class="code">
326 Image *FlopImage(const Image *image,ExceptionInfo *exception)
327</pre>
328
329<p>A description of each parameter follows:</p>
330
331<h5>image</h5>
332<p>the image.</p>
333
334<h5>exception</h5>
335<p>return any errors or warnings in this structure.</p>
336
337 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]338<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]339<div class="doc-section">
340
341<p>RollImage() offsets an image as defined by x_offset and y_offset.</p>
342
343<p>The format of the RollImage method is:</p>
344
345<pre class="code">
346 Image *RollImage(const Image *image,const ssize_t x_offset,
347 const ssize_t y_offset,ExceptionInfo *exception)
348</pre>
349
350<p>A description of each parameter follows:</p>
351
352<h5>image</h5>
353<p>the image.</p>
354
355<h5>x_offset</h5>
356<p>the number of columns to roll in the horizontal direction.</p>
357
358<h5>y_offset</h5>
359<p>the number of rows to roll in the vertical direction.</p>
360
361<h5>exception</h5>
362<p>return any errors or warnings in this structure.</p>
363
364 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]365<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]366<div class="doc-section">
367
368<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>
369
370<p>The format of the ShaveImage method is:</p>
371
372<pre class="code">
373 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
374 ExceptionInfo *exception)
375</pre>
376
377<p>A description of each parameter follows:</p>
378
379<h5>shave_image</h5>
380<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>
381
382<h5>image</h5>
383<p>the image.</p>
384
385<h5>shave_info</h5>
386<p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p>
387
388<h5>exception</h5>
389<p>return any errors or warnings in this structure.</p>
390
391 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]392<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]393<div class="doc-section">
394
395<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p>
396
397<p>The format of the SpliceImage method is:</p>
398
399<pre class="code">
400 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
401 ExceptionInfo *exception)
402</pre>
403
404<p>A description of each parameter follows:</p>
405
406<h5>image</h5>
407<p>the image.</p>
408
409<h5>geometry</h5>
410<p>Define the region of the image to splice with members x, y, width, and height.</p>
411
412<h5>exception</h5>
413<p>return any errors or warnings in this structure.</p>
414
415 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]416<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]417<div class="doc-section">
418
419<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>
420
421<p>The format of the TransformImage method is:</p>
422
423<pre class="code">
424 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
425 const char *image_geometry)
426</pre>
427
428<p>A description of each parameter follows:</p>
429
430<h5>image</h5>
431<p>the image The transformed image is returned as this parameter.</p>
432
433<h5>crop_geometry</h5>
434<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
435
436<h5>image_geometry</h5>
437<p>An image geometry string. This geometry defines the final size of the image.</p>
438
439 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]440<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]441<div class="doc-section">
442
443<p>TransformImages() calls TransformImage() on each image of a sequence.</p>
444
445<p>The format of the TransformImage method is:</p>
446
447<pre class="code">
448 MagickBooleanType TransformImages(Image **image,
449 const char *crop_geometry,const char *image_geometry)
450</pre>
451
452<p>A description of each parameter follows:</p>
453
454<h5>image</h5>
455<p>the image The transformed image is returned as this parameter.</p>
456
457<h5>crop_geometry</h5>
458<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
459
460<h5>image_geometry</h5>
461<p>An image geometry string. This geometry defines the final size of the image.</p>
462
463 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]464<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]465<div class="doc-section">
466
467<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p>
468
469<p>The format of the TransposeImage method is:</p>
470
471<pre class="code">
472 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
473</pre>
474
475<p>A description of each parameter follows:</p>
476
477<h5>image</h5>
478<p>the image.</p>
479
480<h5>exception</h5>
481<p>return any errors or warnings in this structure.</p>
482
483 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]484<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]485<div class="doc-section">
486
487<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p>
488
489<p>The format of the TransverseImage method is:</p>
490
491<pre class="code">
492 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
493</pre>
494
495<p>A description of each parameter follows:</p>
496
497<h5>image</h5>
498<p>the image.</p>
499
500<h5>exception</h5>
501<p>return any errors or warnings in this structure.</p>
502
503 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]504<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]505<div class="doc-section">
506
507<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>
508
509<p>The format of the TrimImage method is:</p>
510
511<pre class="code">
512 Image *TrimImage(const Image *image,ExceptionInfo *exception)
513</pre>
514
515<p>A description of each parameter follows:</p>
516
517<h5>image</h5>
518<p>the image.</p>
519
520<h5>exception</h5>
521<p>return any errors or warnings in this structure.</p>
522
523 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]524
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