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cristy307ba182010-12-25 01:00:34 +0000170<h1>Module transform
171 Methods</h1>
cristyf1196bb2010-02-13 21:18:03 +0000172<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 +0000173
174<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
cristyf1196bb2010-02-13 21:18:03 +0000175_8c.html" target="source" name="ChopImage">ChopImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000176<div class="doc-section">
177
cristyf1196bb2010-02-13 21:18:03 +0000178<p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p></ol>
cristy3ed852e2009-09-05 21:47:34 +0000179
180<p>The format of the ChopImage method is:</p>
181
182<pre class="code">
183 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
184 ExceptionInfo *exception)
185</pre>
186
187<p>A description of each parameter follows:</p></ol>
188
189<h5>image</h5>
190<ol><p>the image.</p></ol>
191
192<h5>chop_info</h5>
193<ol><p>Define the region of the image to chop.</p></ol>
194
195<h5>exception</h5>
196<ol><p>return any errors or warnings in this structure.</p></ol>
197
198 </div>
199<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
200_8c.html" target="source" name="CropImage">CropImage</a></h2>
201<div class="doc-section">
202
203<p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p></ol>
204
205<p>The format of the CropImage method is:</p>
206
207<pre class="code">
208 Image *CropImage(const Image *image,const RectangleInfo *geometry,
209 ExceptionInfo *exception)
210</pre>
211
212<p>A description of each parameter follows:</p></ol>
213
214<h5>image</h5>
215<ol><p>the image.</p></ol>
216
217<h5>geometry</h5>
218<ol><p>Define the region of the image to crop with members x, y, width, and height.</p></ol>
219
220<h5>exception</h5>
221<ol><p>return any errors or warnings in this structure.</p></ol>
222
223 </div>
224<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
225_8c.html" target="source" name="ExcerptImage">ExcerptImage</a></h2>
226<div class="doc-section">
227
228<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p></ol>
229
230<p>The format of the ExcerptImage method is:</p>
231
232<pre class="code">
233 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
234 ExceptionInfo *exception)
235</pre>
236
237<p>A description of each parameter follows:</p></ol>
238
239<h5>image</h5>
240<ol><p>the image.</p></ol>
241
242<h5>geometry</h5>
243<ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
244
245<h5>exception</h5>
246<ol><p>return any errors or warnings in this structure.</p></ol>
247
248 </div>
249<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
250_8c.html" target="source" name="ExtentImage">ExtentImage</a></h2>
251<div class="doc-section">
252
253<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></ol>
254
255<p>The format of the ExtentImage method is:</p>
256
257<pre class="code">
258 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
259 ExceptionInfo *exception)
260</pre>
261
262<p>A description of each parameter follows:</p></ol>
263
264<h5>image</h5>
265<ol><p>the image.</p></ol>
266
267<h5>geometry</h5>
268<ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
269
270<h5>exception</h5>
271<ol><p>return any errors or warnings in this structure.</p></ol>
272
273 </div>
274<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
275_8c.html" target="source" name="FlipImage">FlipImage</a></h2>
276<div class="doc-section">
277
278<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p></ol>
279
280<p>The format of the FlipImage method is:</p>
281
282<pre class="code">
283 Image *FlipImage(const Image *image,ExceptionInfo *exception)
284</pre>
285
286<p>A description of each parameter follows:</p></ol>
287
288<h5>image</h5>
289<ol><p>the image.</p></ol>
290
291<h5>exception</h5>
292<ol><p>return any errors or warnings in this structure.</p></ol>
293
294 </div>
295<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
296_8c.html" target="source" name="FlopImage">FlopImage</a></h2>
297<div class="doc-section">
298
299<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p></ol>
300
301<p>The format of the FlopImage method is:</p>
302
303<pre class="code">
304 Image *FlopImage(const Image *image,ExceptionInfo *exception)
305</pre>
306
307<p>A description of each parameter follows:</p></ol>
308
309<h5>image</h5>
310<ol><p>the image.</p></ol>
311
312<h5>exception</h5>
313<ol><p>return any errors or warnings in this structure.</p></ol>
314
315 </div>
316<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
317_8c.html" target="source" name="RollImage">RollImage</a></h2>
318<div class="doc-section">
319
320<p>RollImage() offsets an image as defined by x_offset and y_offset.</p></ol>
321
322<p>The format of the RollImage method is:</p>
323
324<pre class="code">
cristybb503372010-05-27 20:51:26 +0000325 Image *RollImage(const Image *image,const ssize_t x_offset,
326 const ssize_t y_offset,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000327</pre>
328
329<p>A description of each parameter follows:</p></ol>
330
331<h5>image</h5>
332<ol><p>the image.</p></ol>
333
334<h5>x_offset</h5>
335<ol><p>the number of columns to roll in the horizontal direction.</p></ol>
336
337<h5>y_offset</h5>
338<ol><p>the number of rows to roll in the vertical direction.</p></ol>
339
340<h5>exception</h5>
341<ol><p>return any errors or warnings in this structure.</p></ol>
342
343 </div>
344<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
345_8c.html" target="source" name="ShaveImage">ShaveImage</a></h2>
346<div class="doc-section">
347
348<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></ol>
349
350<p>The format of the ShaveImage method is:</p>
351
352<pre class="code">
353 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
354 ExceptionInfo *exception)
355</pre>
356
357<p>A description of each parameter follows:</p></ol>
358
359<h5>shave_image</h5>
360<ol><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></ol>
361
362<h5>image</h5>
363<ol><p>the image.</p></ol>
364
365<h5>shave_info</h5>
366<ol><p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p></ol>
367
368<h5>exception</h5>
369<ol><p>return any errors or warnings in this structure.</p></ol>
370
371 </div>
372<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
373_8c.html" target="source" name="SpliceImage">SpliceImage</a></h2>
374<div class="doc-section">
375
376<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p></ol>
377
378<p>The format of the SpliceImage method is:</p>
379
380<pre class="code">
381 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
382 ExceptionInfo *exception)
383</pre>
384
385<p>A description of each parameter follows:</p></ol>
386
387<h5>image</h5>
388<ol><p>the image.</p></ol>
389
390<h5>geometry</h5>
391<ol><p>Define the region of the image to splice with members x, y, width, and height.</p></ol>
392
393<h5>exception</h5>
394<ol><p>return any errors or warnings in this structure.</p></ol>
395
396 </div>
397<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
398_8c.html" target="source" name="TransformImage">TransformImage</a></h2>
399<div class="doc-section">
400
401<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></ol>
402
403<p>The format of the TransformImage method is:</p>
404
405<pre class="code">
406 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
407 const char *image_geometry)
408</pre>
409
410<p>A description of each parameter follows:</p></ol>
411
412<h5>image</h5>
413<ol><p>the image The transformed image is returned as this parameter.</p></ol>
414
415<h5>crop_geometry</h5>
416<ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
417
418<h5>image_geometry</h5>
419<ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
420
421 </div>
422<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
423_8c.html" target="source" name="TransformImages">TransformImages</a></h2>
424<div class="doc-section">
425
426<p>TransformImages() calls TransformImage() on each image of a sequence.</p></ol>
427
428<p>The format of the TransformImage method is:</p>
429
430<pre class="code">
431 MagickBooleanType TransformImages(Image **image,
432 const char *crop_geometry,const char *image_geometry)
433</pre>
434
435<p>A description of each parameter follows:</p></ol>
436
437<h5>image</h5>
438<ol><p>the image The transformed image is returned as this parameter.</p></ol>
439
440<h5>crop_geometry</h5>
441<ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
442
443<h5>image_geometry</h5>
444<ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
445
446 </div>
447<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
448_8c.html" target="source" name="TransposeImage">TransposeImage</a></h2>
449<div class="doc-section">
450
451<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p></ol>
452
453<p>The format of the TransposeImage method is:</p>
454
455<pre class="code">
456 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
457</pre>
458
459<p>A description of each parameter follows:</p></ol>
460
461<h5>image</h5>
462<ol><p>the image.</p></ol>
463
464<h5>exception</h5>
465<ol><p>return any errors or warnings in this structure.</p></ol>
466
467 </div>
468<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
469_8c.html" target="source" name="TransverseImage">TransverseImage</a></h2>
470<div class="doc-section">
471
472<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p></ol>
473
474<p>The format of the TransverseImage method is:</p>
475
476<pre class="code">
477 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
478</pre>
479
480<p>A description of each parameter follows:</p></ol>
481
482<h5>image</h5>
483<ol><p>the image.</p></ol>
484
485<h5>exception</h5>
486<ol><p>return any errors or warnings in this structure.</p></ol>
487
488 </div>
489<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
490_8c.html" target="source" name="TrimImage">TrimImage</a></h2>
491<div class="doc-section">
492
493<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></ol>
494
495<p>The format of the TrimImage method is:</p>
496
497<pre class="code">
498 Image *TrimImage(const Image *image,ExceptionInfo *exception)
499</pre>
500
501<p>A description of each parameter follows:</p></ol>
502
503<h5>image</h5>
504<ol><p>the image.</p></ol>
505
506<h5>exception</h5>
507<ol><p>return any errors or warnings in this structure.</p></ol>
508
509 </div>
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