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192
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame^]193<h1>Module transform
194 Methods</h1>
195<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]196
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame^]197<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
198_8c.html" id="ChopImage">ChopImage</a></h2>
199<div class="doc-section">
200
201<p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p>
202
203<p>The format of the ChopImage method is:</p>
204
205<pre class="code">
206 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
207 ExceptionInfo *exception)
208</pre>
209
210<p>A description of each parameter follows:</p>
211
212<h5>image</h5>
213<p>the image.</p>
214
215<h5>chop_info</h5>
216<p>Define the region of the image to chop.</p>
217
218<h5>exception</h5>
219<p>return any errors or warnings in this structure.</p>
220
221 </div>
222<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
223_8c.html" id="CropImage">CropImage</a></h2>
224<div class="doc-section">
225
226<p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p>
227
228<p>The format of the CropImage method is:</p>
229
230<pre class="code">
231 Image *CropImage(const Image *image,const RectangleInfo *geometry,
232 ExceptionInfo *exception)
233</pre>
234
235<p>A description of each parameter follows:</p>
236
237<h5>image</h5>
238<p>the image.</p>
239
240<h5>geometry</h5>
241<p>Define the region of the image to crop with members x, y, width, and height.</p>
242
243<h5>exception</h5>
244<p>return any errors or warnings in this structure.</p>
245
246 </div>
247<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
248_8c.html" id="ExcerptImage">ExcerptImage</a></h2>
249<div class="doc-section">
250
251<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p>
252
253<p>The format of the ExcerptImage method is:</p>
254
255<pre class="code">
256 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
257 ExceptionInfo *exception)
258</pre>
259
260<p>A description of each parameter follows:</p>
261
262<h5>image</h5>
263<p>the image.</p>
264
265<h5>geometry</h5>
266<p>Define the region of the image to extend with members x, y, width, and height.</p>
267
268<h5>exception</h5>
269<p>return any errors or warnings in this structure.</p>
270
271 </div>
272<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
273_8c.html" id="ExtentImage">ExtentImage</a></h2>
274<div class="doc-section">
275
276<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>
277
278<p>The format of the ExtentImage method is:</p>
279
280<pre class="code">
281 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
282 ExceptionInfo *exception)
283</pre>
284
285<p>A description of each parameter follows:</p>
286
287<h5>image</h5>
288<p>the image.</p>
289
290<h5>geometry</h5>
291<p>Define the region of the image to extend with members x, y, width, and height.</p>
292
293<h5>exception</h5>
294<p>return any errors or warnings in this structure.</p>
295
296 </div>
297<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
298_8c.html" id="FlipImage">FlipImage</a></h2>
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>
318<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
319_8c.html" id="FlopImage">FlopImage</a></h2>
320<div class="doc-section">
321
322<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p>
323
324<p>The format of the FlopImage method is:</p>
325
326<pre class="code">
327 Image *FlopImage(const Image *image,ExceptionInfo *exception)
328</pre>
329
330<p>A description of each parameter follows:</p>
331
332<h5>image</h5>
333<p>the image.</p>
334
335<h5>exception</h5>
336<p>return any errors or warnings in this structure.</p>
337
338 </div>
339<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
340_8c.html" id="RollImage">RollImage</a></h2>
341<div class="doc-section">
342
343<p>RollImage() offsets an image as defined by x_offset and y_offset.</p>
344
345<p>The format of the RollImage method is:</p>
346
347<pre class="code">
348 Image *RollImage(const Image *image,const ssize_t x_offset,
349 const ssize_t y_offset,ExceptionInfo *exception)
350</pre>
351
352<p>A description of each parameter follows:</p>
353
354<h5>image</h5>
355<p>the image.</p>
356
357<h5>x_offset</h5>
358<p>the number of columns to roll in the horizontal direction.</p>
359
360<h5>y_offset</h5>
361<p>the number of rows to roll in the vertical direction.</p>
362
363<h5>exception</h5>
364<p>return any errors or warnings in this structure.</p>
365
366 </div>
367<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
368_8c.html" id="ShaveImage">ShaveImage</a></h2>
369<div class="doc-section">
370
371<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>
372
373<p>The format of the ShaveImage method is:</p>
374
375<pre class="code">
376 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
377 ExceptionInfo *exception)
378</pre>
379
380<p>A description of each parameter follows:</p>
381
382<h5>shave_image</h5>
383<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>
384
385<h5>image</h5>
386<p>the image.</p>
387
388<h5>shave_info</h5>
389<p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p>
390
391<h5>exception</h5>
392<p>return any errors or warnings in this structure.</p>
393
394 </div>
395<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
396_8c.html" id="SpliceImage">SpliceImage</a></h2>
397<div class="doc-section">
398
399<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p>
400
401<p>The format of the SpliceImage method is:</p>
402
403<pre class="code">
404 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
405 ExceptionInfo *exception)
406</pre>
407
408<p>A description of each parameter follows:</p>
409
410<h5>image</h5>
411<p>the image.</p>
412
413<h5>geometry</h5>
414<p>Define the region of the image to splice with members x, y, width, and height.</p>
415
416<h5>exception</h5>
417<p>return any errors or warnings in this structure.</p>
418
419 </div>
420<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
421_8c.html" id="TransformImage">TransformImage</a></h2>
422<div class="doc-section">
423
424<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>
425
426<p>The format of the TransformImage method is:</p>
427
428<pre class="code">
429 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
430 const char *image_geometry)
431</pre>
432
433<p>A description of each parameter follows:</p>
434
435<h5>image</h5>
436<p>the image The transformed image is returned as this parameter.</p>
437
438<h5>crop_geometry</h5>
439<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
440
441<h5>image_geometry</h5>
442<p>An image geometry string. This geometry defines the final size of the image.</p>
443
444 </div>
445<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
446_8c.html" id="TransformImages">TransformImages</a></h2>
447<div class="doc-section">
448
449<p>TransformImages() calls TransformImage() on each image of a sequence.</p>
450
451<p>The format of the TransformImage method is:</p>
452
453<pre class="code">
454 MagickBooleanType TransformImages(Image **image,
455 const char *crop_geometry,const char *image_geometry)
456</pre>
457
458<p>A description of each parameter follows:</p>
459
460<h5>image</h5>
461<p>the image The transformed image is returned as this parameter.</p>
462
463<h5>crop_geometry</h5>
464<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
465
466<h5>image_geometry</h5>
467<p>An image geometry string. This geometry defines the final size of the image.</p>
468
469 </div>
470<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
471_8c.html" id="TransposeImage">TransposeImage</a></h2>
472<div class="doc-section">
473
474<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p>
475
476<p>The format of the TransposeImage method is:</p>
477
478<pre class="code">
479 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
480</pre>
481
482<p>A description of each parameter follows:</p>
483
484<h5>image</h5>
485<p>the image.</p>
486
487<h5>exception</h5>
488<p>return any errors or warnings in this structure.</p>
489
490 </div>
491<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
492_8c.html" id="TransverseImage">TransverseImage</a></h2>
493<div class="doc-section">
494
495<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p>
496
497<p>The format of the TransverseImage method is:</p>
498
499<pre class="code">
500 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
501</pre>
502
503<p>A description of each parameter follows:</p>
504
505<h5>image</h5>
506<p>the image.</p>
507
508<h5>exception</h5>
509<p>return any errors or warnings in this structure.</p>
510
511 </div>
512<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
513_8c.html" id="TrimImage">TrimImage</a></h2>
514<div class="doc-section">
515
516<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>
517
518<p>The format of the TrimImage method is:</p>
519
520<pre class="code">
521 Image *TrimImage(const Image *image,ExceptionInfo *exception)
522</pre>
523
524<p>A description of each parameter follows:</p>
525
526<h5>image</h5>
527<p>the image.</p>
528
529<h5>exception</h5>
530<p>return any errors or warnings in this structure.</p>
531
532 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]533
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