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176
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]177<h1>Module transform
178 Methods</h1>
cristyf1196bb2010-02-13 21:18:03 +0000[diff] [blame]179<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]180
181<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
cristyf1196bb2010-02-13 21:18:03 +0000[diff] [blame]182_8c.html" target="source" name="ChopImage">ChopImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]183<div class="doc-section">
184
cristyf1196bb2010-02-13 21:18:03 +0000[diff] [blame]185<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]186
187<p>The format of the ChopImage method is:</p>
188
189<pre class="code">
190 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
191 ExceptionInfo *exception)
192</pre>
193
194<p>A description of each parameter follows:</p></ol>
195
196<h5>image</h5>
197<ol><p>the image.</p></ol>
198
199<h5>chop_info</h5>
200<ol><p>Define the region of the image to chop.</p></ol>
201
202<h5>exception</h5>
203<ol><p>return any errors or warnings in this structure.</p></ol>
204
205 </div>
206<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
207_8c.html" target="source" name="CropImage">CropImage</a></h2>
208<div class="doc-section">
209
210<p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p></ol>
211
212<p>The format of the CropImage method is:</p>
213
214<pre class="code">
215 Image *CropImage(const Image *image,const RectangleInfo *geometry,
216 ExceptionInfo *exception)
217</pre>
218
219<p>A description of each parameter follows:</p></ol>
220
221<h5>image</h5>
222<ol><p>the image.</p></ol>
223
224<h5>geometry</h5>
225<ol><p>Define the region of the image to crop with members x, y, width, and height.</p></ol>
226
227<h5>exception</h5>
228<ol><p>return any errors or warnings in this structure.</p></ol>
229
230 </div>
231<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
232_8c.html" target="source" name="ExcerptImage">ExcerptImage</a></h2>
233<div class="doc-section">
234
235<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p></ol>
236
237<p>The format of the ExcerptImage method is:</p>
238
239<pre class="code">
240 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
241 ExceptionInfo *exception)
242</pre>
243
244<p>A description of each parameter follows:</p></ol>
245
246<h5>image</h5>
247<ol><p>the image.</p></ol>
248
249<h5>geometry</h5>
250<ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
251
252<h5>exception</h5>
253<ol><p>return any errors or warnings in this structure.</p></ol>
254
255 </div>
256<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
257_8c.html" target="source" name="ExtentImage">ExtentImage</a></h2>
258<div class="doc-section">
259
260<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>
261
262<p>The format of the ExtentImage method is:</p>
263
264<pre class="code">
265 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
266 ExceptionInfo *exception)
267</pre>
268
269<p>A description of each parameter follows:</p></ol>
270
271<h5>image</h5>
272<ol><p>the image.</p></ol>
273
274<h5>geometry</h5>
275<ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
276
277<h5>exception</h5>
278<ol><p>return any errors or warnings in this structure.</p></ol>
279
280 </div>
281<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
282_8c.html" target="source" name="FlipImage">FlipImage</a></h2>
283<div class="doc-section">
284
285<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p></ol>
286
287<p>The format of the FlipImage method is:</p>
288
289<pre class="code">
290 Image *FlipImage(const Image *image,ExceptionInfo *exception)
291</pre>
292
293<p>A description of each parameter follows:</p></ol>
294
295<h5>image</h5>
296<ol><p>the image.</p></ol>
297
298<h5>exception</h5>
299<ol><p>return any errors or warnings in this structure.</p></ol>
300
301 </div>
302<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
303_8c.html" target="source" name="FlopImage">FlopImage</a></h2>
304<div class="doc-section">
305
306<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p></ol>
307
308<p>The format of the FlopImage method is:</p>
309
310<pre class="code">
311 Image *FlopImage(const Image *image,ExceptionInfo *exception)
312</pre>
313
314<p>A description of each parameter follows:</p></ol>
315
316<h5>image</h5>
317<ol><p>the image.</p></ol>
318
319<h5>exception</h5>
320<ol><p>return any errors or warnings in this structure.</p></ol>
321
322 </div>
323<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
324_8c.html" target="source" name="RollImage">RollImage</a></h2>
325<div class="doc-section">
326
327<p>RollImage() offsets an image as defined by x_offset and y_offset.</p></ol>
328
329<p>The format of the RollImage method is:</p>
330
331<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]332 Image *RollImage(const Image *image,const ssize_t x_offset,
333 const ssize_t y_offset,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]334</pre>
335
336<p>A description of each parameter follows:</p></ol>
337
338<h5>image</h5>
339<ol><p>the image.</p></ol>
340
341<h5>x_offset</h5>
342<ol><p>the number of columns to roll in the horizontal direction.</p></ol>
343
344<h5>y_offset</h5>
345<ol><p>the number of rows to roll in the vertical direction.</p></ol>
346
347<h5>exception</h5>
348<ol><p>return any errors or warnings in this structure.</p></ol>
349
350 </div>
351<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
352_8c.html" target="source" name="ShaveImage">ShaveImage</a></h2>
353<div class="doc-section">
354
355<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>
356
357<p>The format of the ShaveImage method is:</p>
358
359<pre class="code">
360 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
361 ExceptionInfo *exception)
362</pre>
363
364<p>A description of each parameter follows:</p></ol>
365
366<h5>shave_image</h5>
367<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>
368
369<h5>image</h5>
370<ol><p>the image.</p></ol>
371
372<h5>shave_info</h5>
373<ol><p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p></ol>
374
375<h5>exception</h5>
376<ol><p>return any errors or warnings in this structure.</p></ol>
377
378 </div>
379<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
380_8c.html" target="source" name="SpliceImage">SpliceImage</a></h2>
381<div class="doc-section">
382
383<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p></ol>
384
385<p>The format of the SpliceImage method is:</p>
386
387<pre class="code">
388 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
389 ExceptionInfo *exception)
390</pre>
391
392<p>A description of each parameter follows:</p></ol>
393
394<h5>image</h5>
395<ol><p>the image.</p></ol>
396
397<h5>geometry</h5>
398<ol><p>Define the region of the image to splice with members x, y, width, and height.</p></ol>
399
400<h5>exception</h5>
401<ol><p>return any errors or warnings in this structure.</p></ol>
402
403 </div>
404<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
405_8c.html" target="source" name="TransformImage">TransformImage</a></h2>
406<div class="doc-section">
407
408<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>
409
410<p>The format of the TransformImage method is:</p>
411
412<pre class="code">
413 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
414 const char *image_geometry)
415</pre>
416
417<p>A description of each parameter follows:</p></ol>
418
419<h5>image</h5>
420<ol><p>the image The transformed image is returned as this parameter.</p></ol>
421
422<h5>crop_geometry</h5>
423<ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
424
425<h5>image_geometry</h5>
426<ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
427
428 </div>
429<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
430_8c.html" target="source" name="TransformImages">TransformImages</a></h2>
431<div class="doc-section">
432
433<p>TransformImages() calls TransformImage() on each image of a sequence.</p></ol>
434
435<p>The format of the TransformImage method is:</p>
436
437<pre class="code">
438 MagickBooleanType TransformImages(Image **image,
439 const char *crop_geometry,const char *image_geometry)
440</pre>
441
442<p>A description of each parameter follows:</p></ol>
443
444<h5>image</h5>
445<ol><p>the image The transformed image is returned as this parameter.</p></ol>
446
447<h5>crop_geometry</h5>
448<ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
449
450<h5>image_geometry</h5>
451<ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
452
453 </div>
454<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
455_8c.html" target="source" name="TransposeImage">TransposeImage</a></h2>
456<div class="doc-section">
457
458<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p></ol>
459
460<p>The format of the TransposeImage method is:</p>
461
462<pre class="code">
463 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
464</pre>
465
466<p>A description of each parameter follows:</p></ol>
467
468<h5>image</h5>
469<ol><p>the image.</p></ol>
470
471<h5>exception</h5>
472<ol><p>return any errors or warnings in this structure.</p></ol>
473
474 </div>
475<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
476_8c.html" target="source" name="TransverseImage">TransverseImage</a></h2>
477<div class="doc-section">
478
479<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p></ol>
480
481<p>The format of the TransverseImage method is:</p>
482
483<pre class="code">
484 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
485</pre>
486
487<p>A description of each parameter follows:</p></ol>
488
489<h5>image</h5>
490<ol><p>the image.</p></ol>
491
492<h5>exception</h5>
493<ol><p>return any errors or warnings in this structure.</p></ol>
494
495 </div>
496<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
497_8c.html" target="source" name="TrimImage">TrimImage</a></h2>
498<div class="doc-section">
499
500<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>
501
502<p>The format of the TrimImage method is:</p>
503
504<pre class="code">
505 Image *TrimImage(const Image *image,ExceptionInfo *exception)
506</pre>
507
508<p>A description of each parameter follows:</p></ol>
509
510<h5>image</h5>
511<ol><p>the image.</p></ol>
512
513<h5>exception</h5>
514<ol><p>return any errors or warnings in this structure.</p></ol>
515
516 </div>
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