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gerrit-public.fairphone.software / platform / external / ImageMagick / 06f63f2865009003d39425e264f6066d7f0b8875 / . / www / api / transform.html
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cristy06f63f22012-10-31 00:50:07 +0000[diff] [blame^]1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
2 "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
3<html version="-//W3C//DTD XHTML 1.1//EN"
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cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]11 <title>ImageMagick: MagickCore, C API for ImageMagick: Transform an Image</title>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]12 <meta http-equiv="content-language" content="en-US"/>
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cristy20398432011-08-11 01:31:50 +0000[diff] [blame]239<h1>Module transform Methods</h1>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]240<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]241
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]242<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ChopImage">ChopImage</a></h2>
243<div class="doc-section">
244
245<p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p>
246
247<p>The format of the ChopImage method is:</p>
248
249<pre class="code">
250 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
251 ExceptionInfo *exception)
252</pre>
253
254<p>A description of each parameter follows:</p>
255
256<h5>image</h5>
257<p>the image.</p>
258
259<h5>chop_info</h5>
260<p>Define the region of the image to chop.</p>
261
262<h5>exception</h5>
263<p>return any errors or warnings in this structure.</p>
264
265 </div>
266<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="CropImage">CropImage</a></h2>
267<div class="doc-section">
268
269<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>
270
271<p>The format of the CropImage method is:</p>
272
273<pre class="code">
274 Image *CropImage(const Image *image,const RectangleInfo *geometry,
275 ExceptionInfo *exception)
276</pre>
277
278<p>A description of each parameter follows:</p>
279
280<h5>image</h5>
281<p>the image.</p>
282
283<h5>geometry</h5>
284<p>Define the region of the image to crop with members x, y, width, and height.</p>
285
286<h5>exception</h5>
287<p>return any errors or warnings in this structure.</p>
288
289 </div>
290<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="CropImageToTiles">CropImageToTiles</a></h2>
291<div class="doc-section">
292
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]293<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]294
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]295<p>Image *CropImageToTiles(const Image *image, const RectangleInfo *crop_geometry, ExceptionInfo *exception)</p>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]296
297<p>A description of each parameter follows:</p>
298
299<h5>image</h5>
300<p>the image The transformed image is returned as this parameter.</p>
301
302<h5>crop_geometry</h5>
303<p>A crop geometry string.</p>
304
305<h5>exception</h5>
306<p>return any errors or warnings in this structure.</p>
307
308 </div>
309<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExcerptImage">ExcerptImage</a></h2>
310<div class="doc-section">
311
312<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p>
313
314<p>The format of the ExcerptImage method is:</p>
315
316<pre class="code">
317 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
318 ExceptionInfo *exception)
319</pre>
320
321<p>A description of each parameter follows:</p>
322
323<h5>image</h5>
324<p>the image.</p>
325
326<h5>geometry</h5>
327<p>Define the region of the image to extend with members x, y, width, and height.</p>
328
329<h5>exception</h5>
330<p>return any errors or warnings in this structure.</p>
331
332 </div>
333<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ExtentImage">ExtentImage</a></h2>
334<div class="doc-section">
335
336<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>
337
338<p>The format of the ExtentImage method is:</p>
339
340<pre class="code">
341 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
342 ExceptionInfo *exception)
343</pre>
344
345<p>A description of each parameter follows:</p>
346
347<h5>image</h5>
348<p>the image.</p>
349
350<h5>geometry</h5>
351<p>Define the region of the image to extend with members x, y, width, and height.</p>
352
353<h5>exception</h5>
354<p>return any errors or warnings in this structure.</p>
355
356 </div>
357<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlipImage">FlipImage</a></h2>
358<div class="doc-section">
359
360<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p>
361
362<p>The format of the FlipImage method is:</p>
363
364<pre class="code">
365 Image *FlipImage(const Image *image,ExceptionInfo *exception)
366</pre>
367
368<p>A description of each parameter follows:</p>
369
370<h5>image</h5>
371<p>the image.</p>
372
373<h5>exception</h5>
374<p>return any errors or warnings in this structure.</p>
375
376 </div>
377<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="FlopImage">FlopImage</a></h2>
378<div class="doc-section">
379
380<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p>
381
382<p>The format of the FlopImage method is:</p>
383
384<pre class="code">
385 Image *FlopImage(const Image *image,ExceptionInfo *exception)
386</pre>
387
388<p>A description of each parameter follows:</p>
389
390<h5>image</h5>
391<p>the image.</p>
392
393<h5>exception</h5>
394<p>return any errors or warnings in this structure.</p>
395
396 </div>
397<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="RollImage">RollImage</a></h2>
398<div class="doc-section">
399
400<p>RollImage() offsets an image as defined by x_offset and y_offset.</p>
401
402<p>The format of the RollImage method is:</p>
403
404<pre class="code">
405 Image *RollImage(const Image *image,const ssize_t x_offset,
406 const ssize_t y_offset,ExceptionInfo *exception)
407</pre>
408
409<p>A description of each parameter follows:</p>
410
411<h5>image</h5>
412<p>the image.</p>
413
414<h5>x_offset</h5>
415<p>the number of columns to roll in the horizontal direction.</p>
416
417<h5>y_offset</h5>
418<p>the number of rows to roll in the vertical direction.</p>
419
420<h5>exception</h5>
421<p>return any errors or warnings in this structure.</p>
422
423 </div>
424<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="ShaveImage">ShaveImage</a></h2>
425<div class="doc-section">
426
427<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>
428
429<p>The format of the ShaveImage method is:</p>
430
431<pre class="code">
432 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
433 ExceptionInfo *exception)
434</pre>
435
436<p>A description of each parameter follows:</p>
437
438<h5>shave_image</h5>
439<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>
440
441<h5>image</h5>
442<p>the image.</p>
443
444<h5>shave_info</h5>
445<p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p>
446
447<h5>exception</h5>
448<p>return any errors or warnings in this structure.</p>
449
450 </div>
451<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="SpliceImage">SpliceImage</a></h2>
452<div class="doc-section">
453
454<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p>
455
456<p>The format of the SpliceImage method is:</p>
457
458<pre class="code">
459 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
460 ExceptionInfo *exception)
461</pre>
462
463<p>A description of each parameter follows:</p>
464
465<h5>image</h5>
466<p>the image.</p>
467
468<h5>geometry</h5>
469<p>Define the region of the image to splice with members x, y, width, and height.</p>
470
471<h5>exception</h5>
472<p>return any errors or warnings in this structure.</p>
473
474 </div>
475<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImage">TransformImage</a></h2>
476<div class="doc-section">
477
478<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>
479
480<p>This should only be used for single images.</p>
481
482<p>The format of the TransformImage method is:</p>
483
484<pre class="code">
485 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
486 const char *image_geometry)
487</pre>
488
489<p>A description of each parameter follows:</p>
490
491<h5>image</h5>
492<p>the image The transformed image is returned as this parameter.</p>
493
494<h5>crop_geometry</h5>
495<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
496
497<h5>image_geometry</h5>
498<p>An image geometry string. This geometry defines the final size of the image.</p>
499
500 </div>
501<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="to_CropImageToTiles">to CropImageToTiles</a></h2>
502<div class="doc-section">
503
504<p>to CropImageToTiles() or ResizeImage(), as appropriate.</p>
505
506 </div>
507<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransformImages">TransformImages</a></h2>
508<div class="doc-section">
509
510<p>TransformImages() calls TransformImage() on each image of a sequence.</p>
511
512<p>The format of the TransformImage method is:</p>
513
514<pre class="code">
515 MagickBooleanType TransformImages(Image **image,
516 const char *crop_geometry,const char *image_geometry)
517</pre>
518
519<p>A description of each parameter follows:</p>
520
521<h5>image</h5>
522<p>the image The transformed image is returned as this parameter.</p>
523
524<h5>crop_geometry</h5>
525<p>A crop geometry string. This geometry defines a subregion of the image to crop.</p>
526
527<h5>image_geometry</h5>
528<p>An image geometry string. This geometry defines the final size of the image.</p>
529
530 </div>
531<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransposeImage">TransposeImage</a></h2>
532<div class="doc-section">
533
534<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p>
535
536<p>The format of the TransposeImage method is:</p>
537
538<pre class="code">
539 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
540</pre>
541
542<p>A description of each parameter follows:</p>
543
544<h5>image</h5>
545<p>the image.</p>
546
547<h5>exception</h5>
548<p>return any errors or warnings in this structure.</p>
549
550 </div>
551<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TransverseImage">TransverseImage</a></h2>
552<div class="doc-section">
553
554<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p>
555
556<p>The format of the TransverseImage method is:</p>
557
558<pre class="code">
559 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
560</pre>
561
562<p>A description of each parameter follows:</p>
563
564<h5>image</h5>
565<p>the image.</p>
566
567<h5>exception</h5>
568<p>return any errors or warnings in this structure.</p>
569
570 </div>
571<h2><a href="http://www.imagemagick.org/api/MagickCore/transform_8c.html" id="TrimImage">TrimImage</a></h2>
572<div class="doc-section">
573
574<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>
575
576<p>The format of the TrimImage method is:</p>
577
578<pre class="code">
579 Image *TrimImage(const Image *image,ExceptionInfo *exception)
580</pre>
581
582<p>A description of each parameter follows:</p>
583
584<h5>image</h5>
585<p>the image.</p>
586
587<h5>exception</h5>
588<p>return any errors or warnings in this structure.</p>
589
590 </div>
cristy06f63f22012-10-31 00:50:07 +0000[diff] [blame^]591
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