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cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]174<h1>Module transform
175 Methods</h1>
cristyf1196bb2010-02-13 21:18:03 +0000[diff] [blame]176<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]177
178<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
cristyf1196bb2010-02-13 21:18:03 +0000[diff] [blame]179_8c.html" target="source" name="ChopImage">ChopImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]180<div class="doc-section">
181
cristyf1196bb2010-02-13 21:18:03 +0000[diff] [blame]182<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 +0000[diff] [blame]183
184<p>The format of the ChopImage method is:</p>
185
186<pre class="code">
187 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
188 ExceptionInfo *exception)
189</pre>
190
191<p>A description of each parameter follows:</p></ol>
192
193<h5>image</h5>
194<ol><p>the image.</p></ol>
195
196<h5>chop_info</h5>
197<ol><p>Define the region of the image to chop.</p></ol>
198
199<h5>exception</h5>
200<ol><p>return any errors or warnings in this structure.</p></ol>
201
202 </div>
203<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
204_8c.html" target="source" name="CropImage">CropImage</a></h2>
205<div class="doc-section">
206
207<p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p></ol>
208
209<p>The format of the CropImage method is:</p>
210
211<pre class="code">
212 Image *CropImage(const Image *image,const RectangleInfo *geometry,
213 ExceptionInfo *exception)
214</pre>
215
216<p>A description of each parameter follows:</p></ol>
217
218<h5>image</h5>
219<ol><p>the image.</p></ol>
220
221<h5>geometry</h5>
222<ol><p>Define the region of the image to crop with members x, y, width, and height.</p></ol>
223
224<h5>exception</h5>
225<ol><p>return any errors or warnings in this structure.</p></ol>
226
227 </div>
228<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
229_8c.html" target="source" name="ExcerptImage">ExcerptImage</a></h2>
230<div class="doc-section">
231
232<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p></ol>
233
234<p>The format of the ExcerptImage method is:</p>
235
236<pre class="code">
237 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
238 ExceptionInfo *exception)
239</pre>
240
241<p>A description of each parameter follows:</p></ol>
242
243<h5>image</h5>
244<ol><p>the image.</p></ol>
245
246<h5>geometry</h5>
247<ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
248
249<h5>exception</h5>
250<ol><p>return any errors or warnings in this structure.</p></ol>
251
252 </div>
253<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
254_8c.html" target="source" name="ExtentImage">ExtentImage</a></h2>
255<div class="doc-section">
256
257<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>
258
259<p>The format of the ExtentImage method is:</p>
260
261<pre class="code">
262 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
263 ExceptionInfo *exception)
264</pre>
265
266<p>A description of each parameter follows:</p></ol>
267
268<h5>image</h5>
269<ol><p>the image.</p></ol>
270
271<h5>geometry</h5>
272<ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
273
274<h5>exception</h5>
275<ol><p>return any errors or warnings in this structure.</p></ol>
276
277 </div>
278<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
279_8c.html" target="source" name="FlipImage">FlipImage</a></h2>
280<div class="doc-section">
281
282<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p></ol>
283
284<p>The format of the FlipImage method is:</p>
285
286<pre class="code">
287 Image *FlipImage(const Image *image,ExceptionInfo *exception)
288</pre>
289
290<p>A description of each parameter follows:</p></ol>
291
292<h5>image</h5>
293<ol><p>the image.</p></ol>
294
295<h5>exception</h5>
296<ol><p>return any errors or warnings in this structure.</p></ol>
297
298 </div>
299<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
300_8c.html" target="source" name="FlopImage">FlopImage</a></h2>
301<div class="doc-section">
302
303<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p></ol>
304
305<p>The format of the FlopImage method is:</p>
306
307<pre class="code">
308 Image *FlopImage(const Image *image,ExceptionInfo *exception)
309</pre>
310
311<p>A description of each parameter follows:</p></ol>
312
313<h5>image</h5>
314<ol><p>the image.</p></ol>
315
316<h5>exception</h5>
317<ol><p>return any errors or warnings in this structure.</p></ol>
318
319 </div>
320<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
321_8c.html" target="source" name="RollImage">RollImage</a></h2>
322<div class="doc-section">
323
324<p>RollImage() offsets an image as defined by x_offset and y_offset.</p></ol>
325
326<p>The format of the RollImage method is:</p>
327
328<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]329 Image *RollImage(const Image *image,const ssize_t x_offset,
330 const ssize_t y_offset,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]331</pre>
332
333<p>A description of each parameter follows:</p></ol>
334
335<h5>image</h5>
336<ol><p>the image.</p></ol>
337
338<h5>x_offset</h5>
339<ol><p>the number of columns to roll in the horizontal direction.</p></ol>
340
341<h5>y_offset</h5>
342<ol><p>the number of rows to roll in the vertical direction.</p></ol>
343
344<h5>exception</h5>
345<ol><p>return any errors or warnings in this structure.</p></ol>
346
347 </div>
348<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
349_8c.html" target="source" name="ShaveImage">ShaveImage</a></h2>
350<div class="doc-section">
351
352<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>
353
354<p>The format of the ShaveImage method is:</p>
355
356<pre class="code">
357 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
358 ExceptionInfo *exception)
359</pre>
360
361<p>A description of each parameter follows:</p></ol>
362
363<h5>shave_image</h5>
364<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>
365
366<h5>image</h5>
367<ol><p>the image.</p></ol>
368
369<h5>shave_info</h5>
370<ol><p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p></ol>
371
372<h5>exception</h5>
373<ol><p>return any errors or warnings in this structure.</p></ol>
374
375 </div>
376<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
377_8c.html" target="source" name="SpliceImage">SpliceImage</a></h2>
378<div class="doc-section">
379
380<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p></ol>
381
382<p>The format of the SpliceImage method is:</p>
383
384<pre class="code">
385 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
386 ExceptionInfo *exception)
387</pre>
388
389<p>A description of each parameter follows:</p></ol>
390
391<h5>image</h5>
392<ol><p>the image.</p></ol>
393
394<h5>geometry</h5>
395<ol><p>Define the region of the image to splice with members x, y, width, and height.</p></ol>
396
397<h5>exception</h5>
398<ol><p>return any errors or warnings in this structure.</p></ol>
399
400 </div>
401<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
402_8c.html" target="source" name="TransformImage">TransformImage</a></h2>
403<div class="doc-section">
404
405<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>
406
407<p>The format of the TransformImage method is:</p>
408
409<pre class="code">
410 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
411 const char *image_geometry)
412</pre>
413
414<p>A description of each parameter follows:</p></ol>
415
416<h5>image</h5>
417<ol><p>the image The transformed image is returned as this parameter.</p></ol>
418
419<h5>crop_geometry</h5>
420<ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
421
422<h5>image_geometry</h5>
423<ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
424
425 </div>
426<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
427_8c.html" target="source" name="TransformImages">TransformImages</a></h2>
428<div class="doc-section">
429
430<p>TransformImages() calls TransformImage() on each image of a sequence.</p></ol>
431
432<p>The format of the TransformImage method is:</p>
433
434<pre class="code">
435 MagickBooleanType TransformImages(Image **image,
436 const char *crop_geometry,const char *image_geometry)
437</pre>
438
439<p>A description of each parameter follows:</p></ol>
440
441<h5>image</h5>
442<ol><p>the image The transformed image is returned as this parameter.</p></ol>
443
444<h5>crop_geometry</h5>
445<ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
446
447<h5>image_geometry</h5>
448<ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
449
450 </div>
451<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
452_8c.html" target="source" name="TransposeImage">TransposeImage</a></h2>
453<div class="doc-section">
454
455<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p></ol>
456
457<p>The format of the TransposeImage method is:</p>
458
459<pre class="code">
460 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
461</pre>
462
463<p>A description of each parameter follows:</p></ol>
464
465<h5>image</h5>
466<ol><p>the image.</p></ol>
467
468<h5>exception</h5>
469<ol><p>return any errors or warnings in this structure.</p></ol>
470
471 </div>
472<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
473_8c.html" target="source" name="TransverseImage">TransverseImage</a></h2>
474<div class="doc-section">
475
476<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p></ol>
477
478<p>The format of the TransverseImage method is:</p>
479
480<pre class="code">
481 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
482</pre>
483
484<p>A description of each parameter follows:</p></ol>
485
486<h5>image</h5>
487<ol><p>the image.</p></ol>
488
489<h5>exception</h5>
490<ol><p>return any errors or warnings in this structure.</p></ol>
491
492 </div>
493<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
494_8c.html" target="source" name="TrimImage">TrimImage</a></h2>
495<div class="doc-section">
496
497<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>
498
499<p>The format of the TrimImage method is:</p>
500
501<pre class="code">
502 Image *TrimImage(const Image *image,ExceptionInfo *exception)
503</pre>
504
505<p>A description of each parameter follows:</p></ol>
506
507<h5>image</h5>
508<ol><p>the image.</p></ol>
509
510<h5>exception</h5>
511<ol><p>return any errors or warnings in this structure.</p></ol>
512
513 </div>
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