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cristy20398432011-08-11 01:31:50 +0000[diff] [blame]231<h1>Module transform Methods</h1>
cristyd8833bf2013-02-24 22:14:53 +0000[diff] [blame^]232<p class="navigation-index">[<a href="transform.html#ChopImage">ChopImage</a> &bull; <a href="transform.html#CropImage">CropImage</a> &bull; <a href="transform.html#CropImageToTiles">CropImageToTiles</a> &bull; <a href="transform.html#ExcerptImage">ExcerptImage</a> &bull; <a href="transform.html#ExtentImage">ExtentImage</a> &bull; <a href="transform.html#FlipImage">FlipImage</a> &bull; <a href="transform.html#FlopImage">FlopImage</a> &bull; <a href="transform.html#RollImage">RollImage</a> &bull; <a href="transform.html#ShaveImage">ShaveImage</a> &bull; <a href="transform.html#SpliceImage">SpliceImage</a> &bull; <a href="transform.html#TransformImage">TransformImage</a> &bull; <a href="transform.html#to CropImageToTiles">to CropImageToTiles</a> &bull; <a href="transform.html#TransformImages">TransformImages</a> &bull; <a href="transform.html#TransposeImage">TransposeImage</a> &bull; <a href="transform.html#TransverseImage">TransverseImage</a> &bull; <a href="transform.html#TrimImage">TrimImage</a>]</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]233
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]234<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ChopImage">ChopImage</a></h2>
235<div class="doc-section">
236
237<p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p>
238
239<p>The format of the ChopImage method is:</p>
240
241<pre class="code">
242 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
243 ExceptionInfo *exception)
244</pre>
245
246<p>A description of each parameter follows:</p>
247
248<h5>image</h5>
249<p>the image.</p>
250
251<h5>chop_info</h5>
252<p>Define the region of the image to chop.</p>
253
254<h5>exception</h5>
255<p>return any errors or warnings in this structure.</p>
256
257 </div>
258<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="CropImage">CropImage</a></h2>
259<div class="doc-section">
260
261<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>
262
263<p>The format of the CropImage method is:</p>
264
265<pre class="code">
266 Image *CropImage(const Image *image,const RectangleInfo *geometry,
267 ExceptionInfo *exception)
268</pre>
269
270<p>A description of each parameter follows:</p>
271
272<h5>image</h5>
273<p>the image.</p>
274
275<h5>geometry</h5>
276<p>Define the region of the image to crop with members x, y, width, and height.</p>
277
278<h5>exception</h5>
279<p>return any errors or warnings in this structure.</p>
280
281 </div>
282<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="CropImageToTiles">CropImageToTiles</a></h2>
283<div class="doc-section">
284
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]285<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]286
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]287<p>Image *CropImageToTiles(const Image *image, const RectangleInfo *crop_geometry, ExceptionInfo *exception)</p>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]288
289<p>A description of each parameter follows:</p>
290
291<h5>image</h5>
292<p>the image The transformed image is returned as this parameter.</p>
293
294<h5>crop_geometry</h5>
295<p>A crop geometry string.</p>
296
297<h5>exception</h5>
298<p>return any errors or warnings in this structure.</p>
299
300 </div>
301<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExcerptImage">ExcerptImage</a></h2>
302<div class="doc-section">
303
304<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p>
305
306<p>The format of the ExcerptImage method is:</p>
307
308<pre class="code">
309 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
310 ExceptionInfo *exception)
311</pre>
312
313<p>A description of each parameter follows:</p>
314
315<h5>image</h5>
316<p>the image.</p>
317
318<h5>geometry</h5>
319<p>Define the region of the image to extend with members x, y, width, and height.</p>
320
321<h5>exception</h5>
322<p>return any errors or warnings in this structure.</p>
323
324 </div>
325<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExtentImage">ExtentImage</a></h2>
326<div class="doc-section">
327
328<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>
329
330<p>The format of the ExtentImage method is:</p>
331
332<pre class="code">
333 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
334 ExceptionInfo *exception)
335</pre>
336
337<p>A description of each parameter follows:</p>
338
339<h5>image</h5>
340<p>the image.</p>
341
342<h5>geometry</h5>
343<p>Define the region of the image to extend with members x, y, width, and height.</p>
344
345<h5>exception</h5>
346<p>return any errors or warnings in this structure.</p>
347
348 </div>
349<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlipImage">FlipImage</a></h2>
350<div class="doc-section">
351
352<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p>
353
354<p>The format of the FlipImage method is:</p>
355
356<pre class="code">
357 Image *FlipImage(const Image *image,ExceptionInfo *exception)
358</pre>
359
360<p>A description of each parameter follows:</p>
361
362<h5>image</h5>
363<p>the image.</p>
364
365<h5>exception</h5>
366<p>return any errors or warnings in this structure.</p>
367
368 </div>
369<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlopImage">FlopImage</a></h2>
370<div class="doc-section">
371
372<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p>
373
374<p>The format of the FlopImage method is:</p>
375
376<pre class="code">
377 Image *FlopImage(const Image *image,ExceptionInfo *exception)
378</pre>
379
380<p>A description of each parameter follows:</p>
381
382<h5>image</h5>
383<p>the image.</p>
384
385<h5>exception</h5>
386<p>return any errors or warnings in this structure.</p>
387
388 </div>
389<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="RollImage">RollImage</a></h2>
390<div class="doc-section">
391
392<p>RollImage() offsets an image as defined by x_offset and y_offset.</p>
393
394<p>The format of the RollImage method is:</p>
395
396<pre class="code">
397 Image *RollImage(const Image *image,const ssize_t x_offset,
398 const ssize_t y_offset,ExceptionInfo *exception)
399</pre>
400
401<p>A description of each parameter follows:</p>
402
403<h5>image</h5>
404<p>the image.</p>
405
406<h5>x_offset</h5>
407<p>the number of columns to roll in the horizontal direction.</p>
408
409<h5>y_offset</h5>
410<p>the number of rows to roll in the vertical direction.</p>
411
412<h5>exception</h5>
413<p>return any errors or warnings in this structure.</p>
414
415 </div>
416<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ShaveImage">ShaveImage</a></h2>
417<div class="doc-section">
418
419<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>
420
421<p>The format of the ShaveImage method is:</p>
422
423<pre class="code">
424 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
425 ExceptionInfo *exception)
426</pre>
427
428<p>A description of each parameter follows:</p>
429
430<h5>shave_image</h5>
431<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>
432
433<h5>image</h5>
434<p>the image.</p>
435
436<h5>shave_info</h5>
437<p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p>
438
439<h5>exception</h5>
440<p>return any errors or warnings in this structure.</p>
441
442 </div>
443<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="SpliceImage">SpliceImage</a></h2>
444<div class="doc-section">
445
446<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p>
447
448<p>The format of the SpliceImage method is:</p>
449
450<pre class="code">
451 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
452 ExceptionInfo *exception)
453</pre>
454
455<p>A description of each parameter follows:</p>
456
457<h5>image</h5>
458<p>the image.</p>
459
460<h5>geometry</h5>
461<p>Define the region of the image to splice with members x, y, width, and height.</p>
462
463<h5>exception</h5>
464<p>return any errors or warnings in this structure.</p>
465
466 </div>
467<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImage">TransformImage</a></h2>
468<div class="doc-section">
469
470<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>
471
472<p>This should only be used for single images.</p>
473
474<p>The format of the TransformImage method is:</p>
475
476<pre class="code">
477 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
478 const char *image_geometry)
479</pre>
480
481<p>A description of each parameter follows:</p>
482
483<h5>image</h5>
484<p>the image The transformed image is returned as this parameter.</p>
485
486<h5>crop_geometry</h5>
487<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
488
489<h5>image_geometry</h5>
490<p>An image geometry string. This geometry defines the final size of the image.</p>
491
492 </div>
493<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="to_CropImageToTiles">to CropImageToTiles</a></h2>
494<div class="doc-section">
495
496<p>to CropImageToTiles() or ResizeImage(), as appropriate.</p>
497
498 </div>
499<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImages">TransformImages</a></h2>
500<div class="doc-section">
501
502<p>TransformImages() calls TransformImage() on each image of a sequence.</p>
503
504<p>The format of the TransformImage method is:</p>
505
506<pre class="code">
507 MagickBooleanType TransformImages(Image **image,
508 const char *crop_geometry,const char *image_geometry)
509</pre>
510
511<p>A description of each parameter follows:</p>
512
513<h5>image</h5>
514<p>the image The transformed image is returned as this parameter.</p>
515
516<h5>crop_geometry</h5>
517<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
518
519<h5>image_geometry</h5>
520<p>An image geometry string. This geometry defines the final size of the image.</p>
521
522 </div>
523<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransposeImage">TransposeImage</a></h2>
524<div class="doc-section">
525
526<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p>
527
528<p>The format of the TransposeImage method is:</p>
529
530<pre class="code">
531 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
532</pre>
533
534<p>A description of each parameter follows:</p>
535
536<h5>image</h5>
537<p>the image.</p>
538
539<h5>exception</h5>
540<p>return any errors or warnings in this structure.</p>
541
542 </div>
543<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransverseImage">TransverseImage</a></h2>
544<div class="doc-section">
545
546<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p>
547
548<p>The format of the TransverseImage method is:</p>
549
550<pre class="code">
551 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
552</pre>
553
554<p>A description of each parameter follows:</p>
555
556<h5>image</h5>
557<p>the image.</p>
558
559<h5>exception</h5>
560<p>return any errors or warnings in this structure.</p>
561
562 </div>
563<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TrimImage">TrimImage</a></h2>
564<div class="doc-section">
565
566<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>
567
568<p>The format of the TrimImage method is:</p>
569
570<pre class="code">
571 Image *TrimImage(const Image *image,ExceptionInfo *exception)
572</pre>
573
574<p>A description of each parameter follows:</p>
575
576<h5>image</h5>
577<p>the image.</p>
578
579<h5>exception</h5>
580<p>return any errors or warnings in this structure.</p>
581
582 </div>
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