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211
212<div class="main">
213
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]214<h1>Module transform Methods</h1>
cristy8e6cb722011-03-28 19:17:44 +0000[diff] [blame]215<p class="navigation-index">[<a href="#ChopImage">ChopImage</a> &bull; <a href="#CropImage">CropImage</a> &bull; <a href="#CropImageToTiles">CropImageToTiles</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="#to CropImageToTiles">to CropImageToTiles</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]216
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]217<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ChopImage">ChopImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]218<div class="doc-section">
219
220<p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p>
221
222<p>The format of the ChopImage method is:</p>
223
224<pre class="code">
225 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
226 ExceptionInfo *exception)
227</pre>
228
229<p>A description of each parameter follows:</p>
230
231<h5>image</h5>
232<p>the image.</p>
233
234<h5>chop_info</h5>
235<p>Define the region of the image to chop.</p>
236
237<h5>exception</h5>
238<p>return any errors or warnings in this structure.</p>
239
240 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]241<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="CropImage">CropImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]242<div class="doc-section">
243
cristy8e6cb722011-03-28 19:17:44 +0000[diff] [blame]244<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>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]245
246<p>The format of the CropImage method is:</p>
247
248<pre class="code">
249 Image *CropImage(const Image *image,const RectangleInfo *geometry,
250 ExceptionInfo *exception)
251</pre>
252
253<p>A description of each parameter follows:</p>
254
255<h5>image</h5>
256<p>the image.</p>
257
258<h5>geometry</h5>
259<p>Define the region of the image to crop with members x, y, width, and height.</p>
260
261<h5>exception</h5>
262<p>return any errors or warnings in this structure.</p>
263
264 </div>
cristy8e6cb722011-03-28 19:17:44 +0000[diff] [blame]265<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="CropImageToTiles">CropImageToTiles</a></h2>
266<div class="doc-section">
267
268<p>CropImageToTiles() will crop a single image, into a posible list of tiles. This may include a single sub-region of the image. This basically applies all the normal geometry flags for Crop.</p>
269
270<p>Image *CropImageToTiles(const Image *image,const RectangleInfo *crop_geometry, ExceptionInfo *exception)</p>
271
272<p>A description of each parameter follows:</p>
273
274<h5>image</h5>
275<p>the image The transformed image is returned as this parameter.</p>
276
277<h5>crop_geometry</h5>
278<p>A crop geometry string.</p>
279
280<h5>exception</h5>
281<p>return any errors or warnings in this structure.</p>
282
283 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]284<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExcerptImage">ExcerptImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]285<div class="doc-section">
286
287<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p>
288
289<p>The format of the ExcerptImage method is:</p>
290
291<pre class="code">
292 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
293 ExceptionInfo *exception)
294</pre>
295
296<p>A description of each parameter follows:</p>
297
298<h5>image</h5>
299<p>the image.</p>
300
301<h5>geometry</h5>
302<p>Define the region of the image to extend with members x, y, width, and height.</p>
303
304<h5>exception</h5>
305<p>return any errors or warnings in this structure.</p>
306
307 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]308<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExtentImage">ExtentImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]309<div class="doc-section">
310
311<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>
312
313<p>The format of the ExtentImage method is:</p>
314
315<pre class="code">
316 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
317 ExceptionInfo *exception)
318</pre>
319
320<p>A description of each parameter follows:</p>
321
322<h5>image</h5>
323<p>the image.</p>
324
325<h5>geometry</h5>
326<p>Define the region of the image to extend with members x, y, width, and height.</p>
327
328<h5>exception</h5>
329<p>return any errors or warnings in this structure.</p>
330
331 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]332<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlipImage">FlipImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]333<div class="doc-section">
334
335<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p>
336
337<p>The format of the FlipImage method is:</p>
338
339<pre class="code">
340 Image *FlipImage(const Image *image,ExceptionInfo *exception)
341</pre>
342
343<p>A description of each parameter follows:</p>
344
345<h5>image</h5>
346<p>the image.</p>
347
348<h5>exception</h5>
349<p>return any errors or warnings in this structure.</p>
350
351 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]352<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlopImage">FlopImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]353<div class="doc-section">
354
355<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p>
356
357<p>The format of the FlopImage method is:</p>
358
359<pre class="code">
360 Image *FlopImage(const Image *image,ExceptionInfo *exception)
361</pre>
362
363<p>A description of each parameter follows:</p>
364
365<h5>image</h5>
366<p>the image.</p>
367
368<h5>exception</h5>
369<p>return any errors or warnings in this structure.</p>
370
371 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]372<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="RollImage">RollImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]373<div class="doc-section">
374
375<p>RollImage() offsets an image as defined by x_offset and y_offset.</p>
376
377<p>The format of the RollImage method is:</p>
378
379<pre class="code">
380 Image *RollImage(const Image *image,const ssize_t x_offset,
381 const ssize_t y_offset,ExceptionInfo *exception)
382</pre>
383
384<p>A description of each parameter follows:</p>
385
386<h5>image</h5>
387<p>the image.</p>
388
389<h5>x_offset</h5>
390<p>the number of columns to roll in the horizontal direction.</p>
391
392<h5>y_offset</h5>
393<p>the number of rows to roll in the vertical direction.</p>
394
395<h5>exception</h5>
396<p>return any errors or warnings in this structure.</p>
397
398 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]399<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ShaveImage">ShaveImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]400<div class="doc-section">
401
402<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>
403
404<p>The format of the ShaveImage method is:</p>
405
406<pre class="code">
407 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
408 ExceptionInfo *exception)
409</pre>
410
411<p>A description of each parameter follows:</p>
412
413<h5>shave_image</h5>
414<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>
415
416<h5>image</h5>
417<p>the image.</p>
418
419<h5>shave_info</h5>
420<p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p>
421
422<h5>exception</h5>
423<p>return any errors or warnings in this structure.</p>
424
425 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]426<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="SpliceImage">SpliceImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]427<div class="doc-section">
428
429<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p>
430
431<p>The format of the SpliceImage method is:</p>
432
433<pre class="code">
434 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
435 ExceptionInfo *exception)
436</pre>
437
438<p>A description of each parameter follows:</p>
439
440<h5>image</h5>
441<p>the image.</p>
442
443<h5>geometry</h5>
444<p>Define the region of the image to splice with members x, y, width, and height.</p>
445
446<h5>exception</h5>
447<p>return any errors or warnings in this structure.</p>
448
449 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]450<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImage">TransformImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]451<div class="doc-section">
452
cristy8e6cb722011-03-28 19:17:44 +0000[diff] [blame]453<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>
454
455<p>This should only be used for single images.</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]456
457<p>The format of the TransformImage method is:</p>
458
459<pre class="code">
460 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
461 const char *image_geometry)
462</pre>
463
464<p>A description of each parameter follows:</p>
465
466<h5>image</h5>
467<p>the image The transformed image is returned as this parameter.</p>
468
469<h5>crop_geometry</h5>
470<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
471
472<h5>image_geometry</h5>
473<p>An image geometry string. This geometry defines the final size of the image.</p>
474
475 </div>
cristy8e6cb722011-03-28 19:17:44 +0000[diff] [blame]476<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="to_CropImageToTiles">to CropImageToTiles</a></h2>
477<div class="doc-section">
478
479<p>to CropImageToTiles() or ResizeImage(), as appropriate.</p>
480
481 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]482<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImages">TransformImages</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]483<div class="doc-section">
484
485<p>TransformImages() calls TransformImage() on each image of a sequence.</p>
486
487<p>The format of the TransformImage method is:</p>
488
489<pre class="code">
490 MagickBooleanType TransformImages(Image **image,
491 const char *crop_geometry,const char *image_geometry)
492</pre>
493
494<p>A description of each parameter follows:</p>
495
496<h5>image</h5>
497<p>the image The transformed image is returned as this parameter.</p>
498
499<h5>crop_geometry</h5>
500<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
501
502<h5>image_geometry</h5>
503<p>An image geometry string. This geometry defines the final size of the image.</p>
504
505 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]506<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransposeImage">TransposeImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]507<div class="doc-section">
508
509<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p>
510
511<p>The format of the TransposeImage method is:</p>
512
513<pre class="code">
514 Image *TransposeImage(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>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]526<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransverseImage">TransverseImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]527<div class="doc-section">
528
529<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p>
530
531<p>The format of the TransverseImage method is:</p>
532
533<pre class="code">
534 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
535</pre>
536
537<p>A description of each parameter follows:</p>
538
539<h5>image</h5>
540<p>the image.</p>
541
542<h5>exception</h5>
543<p>return any errors or warnings in this structure.</p>
544
545 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]546<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TrimImage">TrimImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]547<div class="doc-section">
548
549<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>
550
551<p>The format of the TrimImage method is:</p>
552
553<pre class="code">
554 Image *TrimImage(const Image *image,ExceptionInfo *exception)
555</pre>
556
557<p>A description of each parameter follows:</p>
558
559<h5>image</h5>
560<p>the image.</p>
561
562<h5>exception</h5>
563<p>return any errors or warnings in this structure.</p>
564
565 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]566
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