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173
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]174<h1>Module transform Methods</h1>
cristyf1b8a092014-02-20 15:46:11 +0000[diff] [blame]175<p class="navigation-index">[<a href="transform.html#ChopImage">ChopImage</a> • <a href="transform.html#CropImage">CropImage</a> • <a href="transform.html#CropImageToTiles">CropImageToTiles</a> • <a href="transform.html#ExcerptImage">ExcerptImage</a> • <a href="transform.html#ExtentImage">ExtentImage</a> • <a href="transform.html#FlipImage">FlipImage</a> • <a href="transform.html#FlopImage">FlopImage</a> • <a href="transform.html#RollImage">RollImage</a> • <a href="transform.html#ShaveImage">ShaveImage</a> • <a href="transform.html#SpliceImage">SpliceImage</a> • <a href="transform.html#TransformImage">TransformImage</a> • <a href="transform.html#to CropImageToTiles">to CropImageToTiles</a> • <a href="transform.html#TransformImages">TransformImages</a> • <a href="transform.html#TransposeImage">TransposeImage</a> • <a href="transform.html#TransverseImage">TransverseImage</a> • <a href="transform.html#TrimImage">TrimImage</a>]</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]176
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]177<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ChopImage">ChopImage</a></h2>
178<div class="doc-section">
179
180<p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p>
181
182<p>The format of the ChopImage method is:</p>
183
184<pre class="code">
185 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
186 ExceptionInfo *exception)
187</pre>
188
189<p>A description of each parameter follows:</p>
190
191<h5>image</h5>
192<p>the image.</p>
193
194<h5>chop_info</h5>
195<p>Define the region of the image to chop.</p>
196
197<h5>exception</h5>
198<p>return any errors or warnings in this structure.</p>
199
200 </div>
201<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="CropImage">CropImage</a></h2>
202<div class="doc-section">
203
204<p>CropImage() extracts a region of the image starting at the offset defined by geometry. Region must be fully defined, and no special handling of geometry flags is performed.</p>
205
206<p>The format of the CropImage method is:</p>
207
208<pre class="code">
209 Image *CropImage(const Image *image,const RectangleInfo *geometry,
210 ExceptionInfo *exception)
211</pre>
212
213<p>A description of each parameter follows:</p>
214
215<h5>image</h5>
216<p>the image.</p>
217
218<h5>geometry</h5>
219<p>Define the region of the image to crop with members x, y, width, and height.</p>
220
221<h5>exception</h5>
222<p>return any errors or warnings in this structure.</p>
223
224 </div>
225<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="CropImageToTiles">CropImageToTiles</a></h2>
226<div class="doc-section">
227
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]228<p>CropImageToTiles() crops a single image, into a possible list of tiles. This may include a single sub-region of the image. This basically applies all the normal geometry flags for Crop.</p>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]229
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]230<p>Image *CropImageToTiles(const Image *image, const RectangleInfo *crop_geometry, ExceptionInfo *exception)</p>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]231
232<p>A description of each parameter follows:</p>
233
234<h5>image</h5>
235<p>the image The transformed image is returned as this parameter.</p>
236
237<h5>crop_geometry</h5>
238<p>A crop geometry string.</p>
239
240<h5>exception</h5>
241<p>return any errors or warnings in this structure.</p>
242
243 </div>
244<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExcerptImage">ExcerptImage</a></h2>
245<div class="doc-section">
246
247<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p>
248
249<p>The format of the ExcerptImage method is:</p>
250
251<pre class="code">
252 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
253 ExceptionInfo *exception)
254</pre>
255
256<p>A description of each parameter follows:</p>
257
258<h5>image</h5>
259<p>the image.</p>
260
261<h5>geometry</h5>
262<p>Define the region of the image to extend with members x, y, width, and height.</p>
263
264<h5>exception</h5>
265<p>return any errors or warnings in this structure.</p>
266
267 </div>
268<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExtentImage">ExtentImage</a></h2>
269<div class="doc-section">
270
271<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>
272
273<p>The format of the ExtentImage method is:</p>
274
275<pre class="code">
276 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
277 ExceptionInfo *exception)
278</pre>
279
280<p>A description of each parameter follows:</p>
281
282<h5>image</h5>
283<p>the image.</p>
284
285<h5>geometry</h5>
286<p>Define the region of the image to extend with members x, y, width, and height.</p>
287
288<h5>exception</h5>
289<p>return any errors or warnings in this structure.</p>
290
291 </div>
292<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlipImage">FlipImage</a></h2>
293<div class="doc-section">
294
295<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p>
296
297<p>The format of the FlipImage method is:</p>
298
299<pre class="code">
300 Image *FlipImage(const Image *image,ExceptionInfo *exception)
301</pre>
302
303<p>A description of each parameter follows:</p>
304
305<h5>image</h5>
306<p>the image.</p>
307
308<h5>exception</h5>
309<p>return any errors or warnings in this structure.</p>
310
311 </div>
312<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlopImage">FlopImage</a></h2>
313<div class="doc-section">
314
315<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p>
316
317<p>The format of the FlopImage method is:</p>
318
319<pre class="code">
320 Image *FlopImage(const Image *image,ExceptionInfo *exception)
321</pre>
322
323<p>A description of each parameter follows:</p>
324
325<h5>image</h5>
326<p>the image.</p>
327
328<h5>exception</h5>
329<p>return any errors or warnings in this structure.</p>
330
331 </div>
332<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="RollImage">RollImage</a></h2>
333<div class="doc-section">
334
335<p>RollImage() offsets an image as defined by x_offset and y_offset.</p>
336
337<p>The format of the RollImage method is:</p>
338
339<pre class="code">
340 Image *RollImage(const Image *image,const ssize_t x_offset,
341 const ssize_t y_offset,ExceptionInfo *exception)
342</pre>
343
344<p>A description of each parameter follows:</p>
345
346<h5>image</h5>
347<p>the image.</p>
348
349<h5>x_offset</h5>
350<p>the number of columns to roll in the horizontal direction.</p>
351
352<h5>y_offset</h5>
353<p>the number of rows to roll in the vertical direction.</p>
354
355<h5>exception</h5>
356<p>return any errors or warnings in this structure.</p>
357
358 </div>
359<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ShaveImage">ShaveImage</a></h2>
360<div class="doc-section">
361
362<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>
363
364<p>The format of the ShaveImage method is:</p>
365
366<pre class="code">
367 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
368 ExceptionInfo *exception)
369</pre>
370
371<p>A description of each parameter follows:</p>
372
373<h5>shave_image</h5>
374<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>
375
376<h5>image</h5>
377<p>the image.</p>
378
379<h5>shave_info</h5>
380<p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p>
381
382<h5>exception</h5>
383<p>return any errors or warnings in this structure.</p>
384
385 </div>
386<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="SpliceImage">SpliceImage</a></h2>
387<div class="doc-section">
388
389<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p>
390
391<p>The format of the SpliceImage method is:</p>
392
393<pre class="code">
394 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
395 ExceptionInfo *exception)
396</pre>
397
398<p>A description of each parameter follows:</p>
399
400<h5>image</h5>
401<p>the image.</p>
402
403<h5>geometry</h5>
404<p>Define the region of the image to splice with members x, y, width, and height.</p>
405
406<h5>exception</h5>
407<p>return any errors or warnings in this structure.</p>
408
409 </div>
410<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImage">TransformImage</a></h2>
411<div class="doc-section">
412
413<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 left as is.</p>
414
415<p>This should only be used for single images.</p>
416
417<p>The format of the TransformImage method is:</p>
418
419<pre class="code">
420 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
421 const char *image_geometry)
422</pre>
423
424<p>A description of each parameter follows:</p>
425
426<h5>image</h5>
427<p>the image The transformed image is returned as this parameter.</p>
428
429<h5>crop_geometry</h5>
430<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
431
432<h5>image_geometry</h5>
433<p>An image geometry string. This geometry defines the final size of the image.</p>
434
435 </div>
436<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="to_CropImageToTiles">to CropImageToTiles</a></h2>
437<div class="doc-section">
438
439<p>to CropImageToTiles() or ResizeImage(), as appropriate.</p>
440
441 </div>
442<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImages">TransformImages</a></h2>
443<div class="doc-section">
444
445<p>TransformImages() calls TransformImage() on each image of a sequence.</p>
446
447<p>The format of the TransformImage method is:</p>
448
449<pre class="code">
450 MagickBooleanType TransformImages(Image **image,
451 const char *crop_geometry,const char *image_geometry)
452</pre>
453
454<p>A description of each parameter follows:</p>
455
456<h5>image</h5>
457<p>the image The transformed image is returned as this parameter.</p>
458
459<h5>crop_geometry</h5>
460<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
461
462<h5>image_geometry</h5>
463<p>An image geometry string. This geometry defines the final size of the image.</p>
464
465 </div>
466<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransposeImage">TransposeImage</a></h2>
467<div class="doc-section">
468
469<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p>
470
471<p>The format of the TransposeImage method is:</p>
472
473<pre class="code">
474 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
475</pre>
476
477<p>A description of each parameter follows:</p>
478
479<h5>image</h5>
480<p>the image.</p>
481
482<h5>exception</h5>
483<p>return any errors or warnings in this structure.</p>
484
485 </div>
486<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransverseImage">TransverseImage</a></h2>
487<div class="doc-section">
488
489<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p>
490
491<p>The format of the TransverseImage method is:</p>
492
493<pre class="code">
494 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
495</pre>
496
497<p>A description of each parameter follows:</p>
498
499<h5>image</h5>
500<p>the image.</p>
501
502<h5>exception</h5>
503<p>return any errors or warnings in this structure.</p>
504
505 </div>
506<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TrimImage">TrimImage</a></h2>
507<div class="doc-section">
508
509<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>
510
511<p>The format of the TrimImage method is:</p>
512
513<pre class="code">
514 Image *TrimImage(const Image *image,ExceptionInfo *exception)
515</pre>
516
517<p>A description of each parameter follows:</p>
518
519<h5>image</h5>
520<p>the image.</p>
521
522<h5>exception</h5>
523<p>return any errors or warnings in this structure.</p>
524
525 </div>
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