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gerrit-public.fairphone.software / platform / external / ImageMagick / b2a2ad039073f47228f55eecd6d2dd49202305b7 / . / www / api / transform.html
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220
221<div class="main">
222
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]223<h1>Module transform Methods</h1>
cristy91469932014-07-25 11:00:25 +0000[diff] [blame]224<p class="navigation-index">[<a href="transform.html#ChopImage">ChopImage</a> &#8226; <a href="transform.html#CropImage">CropImage</a> &#8226; <a href="transform.html#CropImageToTiles">CropImageToTiles</a> &#8226; <a href="transform.html#ExcerptImage">ExcerptImage</a> &#8226; <a href="transform.html#ExtentImage">ExtentImage</a> &#8226; <a href="transform.html#FlipImage">FlipImage</a> &#8226; <a href="transform.html#FlopImage">FlopImage</a> &#8226; <a href="transform.html#RollImage">RollImage</a> &#8226; <a href="transform.html#ShaveImage">ShaveImage</a> &#8226; <a href="transform.html#SpliceImage">SpliceImage</a> &#8226; <a href="transform.html#TransformImage">TransformImage</a> &#8226; <a href="transform.html#to CropImageToTiles">to CropImageToTiles</a> &#8226; <a href="transform.html#TransformImages">TransformImages</a> &#8226; <a href="transform.html#TransposeImage">TransposeImage</a> &#8226; <a href="transform.html#TransverseImage">TransverseImage</a> &#8226; <a href="transform.html#TrimImage">TrimImage</a>]</p>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]225
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]226<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ChopImage">ChopImage</a></h2>
227<div class="doc-section">
228
229<p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p>
230
231<p>The format of the ChopImage method is:</p>
232
233<pre class="code">
234 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
235 ExceptionInfo *exception)
236</pre>
237
238<p>A description of each parameter follows:</p>
239
240<h5>image</h5>
241<p>the image.</p>
242
243<h5>chop_info</h5>
244<p>Define the region of the image to chop.</p>
245
246<h5>exception</h5>
247<p>return any errors or warnings in this structure.</p>
248
249 </div>
250<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="CropImage">CropImage</a></h2>
251<div class="doc-section">
252
253<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>
254
255<p>The format of the CropImage method is:</p>
256
257<pre class="code">
258 Image *CropImage(const Image *image,const RectangleInfo *geometry,
259 ExceptionInfo *exception)
260</pre>
261
262<p>A description of each parameter follows:</p>
263
264<h5>image</h5>
265<p>the image.</p>
266
267<h5>geometry</h5>
268<p>Define the region of the image to crop with members x, y, width, and height.</p>
269
270<h5>exception</h5>
271<p>return any errors or warnings in this structure.</p>
272
273 </div>
274<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="CropImageToTiles">CropImageToTiles</a></h2>
275<div class="doc-section">
276
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]277<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]278
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]279<p>Image *CropImageToTiles(const Image *image, const RectangleInfo *crop_geometry, ExceptionInfo *exception)</p>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]280
281<p>A description of each parameter follows:</p>
282
283<h5>image</h5>
284<p>the image The transformed image is returned as this parameter.</p>
285
286<h5>crop_geometry</h5>
287<p>A crop geometry string.</p>
288
289<h5>exception</h5>
290<p>return any errors or warnings in this structure.</p>
291
292 </div>
293<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExcerptImage">ExcerptImage</a></h2>
294<div class="doc-section">
295
296<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p>
297
298<p>The format of the ExcerptImage method is:</p>
299
300<pre class="code">
301 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
302 ExceptionInfo *exception)
303</pre>
304
305<p>A description of each parameter follows:</p>
306
307<h5>image</h5>
308<p>the image.</p>
309
310<h5>geometry</h5>
311<p>Define the region of the image to extend with members x, y, width, and height.</p>
312
313<h5>exception</h5>
314<p>return any errors or warnings in this structure.</p>
315
316 </div>
317<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExtentImage">ExtentImage</a></h2>
318<div class="doc-section">
319
320<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>
321
322<p>The format of the ExtentImage method is:</p>
323
324<pre class="code">
325 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
326 ExceptionInfo *exception)
327</pre>
328
329<p>A description of each parameter follows:</p>
330
331<h5>image</h5>
332<p>the image.</p>
333
334<h5>geometry</h5>
335<p>Define the region of the image to extend with members x, y, width, and height.</p>
336
337<h5>exception</h5>
338<p>return any errors or warnings in this structure.</p>
339
340 </div>
341<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlipImage">FlipImage</a></h2>
342<div class="doc-section">
343
344<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p>
345
346<p>The format of the FlipImage method is:</p>
347
348<pre class="code">
349 Image *FlipImage(const Image *image,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>exception</h5>
358<p>return any errors or warnings in this structure.</p>
359
360 </div>
361<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlopImage">FlopImage</a></h2>
362<div class="doc-section">
363
364<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p>
365
366<p>The format of the FlopImage method is:</p>
367
368<pre class="code">
369 Image *FlopImage(const Image *image,ExceptionInfo *exception)
370</pre>
371
372<p>A description of each parameter follows:</p>
373
374<h5>image</h5>
375<p>the image.</p>
376
377<h5>exception</h5>
378<p>return any errors or warnings in this structure.</p>
379
380 </div>
381<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="RollImage">RollImage</a></h2>
382<div class="doc-section">
383
384<p>RollImage() offsets an image as defined by x_offset and y_offset.</p>
385
386<p>The format of the RollImage method is:</p>
387
388<pre class="code">
389 Image *RollImage(const Image *image,const ssize_t x_offset,
390 const ssize_t y_offset,ExceptionInfo *exception)
391</pre>
392
393<p>A description of each parameter follows:</p>
394
395<h5>image</h5>
396<p>the image.</p>
397
398<h5>x_offset</h5>
399<p>the number of columns to roll in the horizontal direction.</p>
400
401<h5>y_offset</h5>
402<p>the number of rows to roll in the vertical direction.</p>
403
404<h5>exception</h5>
405<p>return any errors or warnings in this structure.</p>
406
407 </div>
408<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ShaveImage">ShaveImage</a></h2>
409<div class="doc-section">
410
411<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>
412
413<p>The format of the ShaveImage method is:</p>
414
415<pre class="code">
416 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
417 ExceptionInfo *exception)
418</pre>
419
420<p>A description of each parameter follows:</p>
421
422<h5>shave_image</h5>
423<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>
424
425<h5>image</h5>
426<p>the image.</p>
427
428<h5>shave_info</h5>
429<p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p>
430
431<h5>exception</h5>
432<p>return any errors or warnings in this structure.</p>
433
434 </div>
435<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="SpliceImage">SpliceImage</a></h2>
436<div class="doc-section">
437
438<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p>
439
440<p>The format of the SpliceImage method is:</p>
441
442<pre class="code">
443 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
444 ExceptionInfo *exception)
445</pre>
446
447<p>A description of each parameter follows:</p>
448
449<h5>image</h5>
450<p>the image.</p>
451
452<h5>geometry</h5>
453<p>Define the region of the image to splice with members x, y, width, and height.</p>
454
455<h5>exception</h5>
456<p>return any errors or warnings in this structure.</p>
457
458 </div>
459<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImage">TransformImage</a></h2>
460<div class="doc-section">
461
462<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>
463
464<p>This should only be used for single images.</p>
465
466<p>The format of the TransformImage method is:</p>
467
468<pre class="code">
469 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
470 const char *image_geometry)
471</pre>
472
473<p>A description of each parameter follows:</p>
474
475<h5>image</h5>
476<p>the image The transformed image is returned as this parameter.</p>
477
478<h5>crop_geometry</h5>
479<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
480
481<h5>image_geometry</h5>
482<p>An image geometry string. This geometry defines the final size of the image.</p>
483
484 </div>
485<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="to_CropImageToTiles">to CropImageToTiles</a></h2>
486<div class="doc-section">
487
488<p>to CropImageToTiles() or ResizeImage(), as appropriate.</p>
489
490 </div>
491<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImages">TransformImages</a></h2>
492<div class="doc-section">
493
494<p>TransformImages() calls TransformImage() on each image of a sequence.</p>
495
496<p>The format of the TransformImage method is:</p>
497
498<pre class="code">
499 MagickBooleanType TransformImages(Image **image,
500 const char *crop_geometry,const char *image_geometry)
501</pre>
502
503<p>A description of each parameter follows:</p>
504
505<h5>image</h5>
506<p>the image The transformed image is returned as this parameter.</p>
507
508<h5>crop_geometry</h5>
509<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
510
511<h5>image_geometry</h5>
512<p>An image geometry string. This geometry defines the final size of the image.</p>
513
514 </div>
515<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransposeImage">TransposeImage</a></h2>
516<div class="doc-section">
517
518<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p>
519
520<p>The format of the TransposeImage method is:</p>
521
522<pre class="code">
523 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
524</pre>
525
526<p>A description of each parameter follows:</p>
527
528<h5>image</h5>
529<p>the image.</p>
530
531<h5>exception</h5>
532<p>return any errors or warnings in this structure.</p>
533
534 </div>
535<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransverseImage">TransverseImage</a></h2>
536<div class="doc-section">
537
538<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p>
539
540<p>The format of the TransverseImage method is:</p>
541
542<pre class="code">
543 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
544</pre>
545
546<p>A description of each parameter follows:</p>
547
548<h5>image</h5>
549<p>the image.</p>
550
551<h5>exception</h5>
552<p>return any errors or warnings in this structure.</p>
553
554 </div>
555<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TrimImage">TrimImage</a></h2>
556<div class="doc-section">
557
558<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>
559
560<p>The format of the TrimImage method is:</p>
561
562<pre class="code">
563 Image *TrimImage(const Image *image,ExceptionInfo *exception)
564</pre>
565
566<p>A description of each parameter follows:</p>
567
568<h5>image</h5>
569<p>the image.</p>
570
571<h5>exception</h5>
572<p>return any errors or warnings in this structure.</p>
573
574 </div>
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