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gerrit-public.fairphone.software / platform / external / ImageMagick / e6e8415823c09ed129e481e0a3bc678324b38c99 / . / www / api / resize.html
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cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]11 <title>ImageMagick: MagickCore, C API for ImageMagick: Resize an Image</title>
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206<div class="main">
207
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]208<h1>Module resize Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]209<p class="navigation-index">[<a href="#AdaptiveResizeImage">AdaptiveResizeImage</a> &bull; <a href="#MagnifyImage">MagnifyImage</a> &bull; <a href="#MinifyImage">MinifyImage</a> &bull; <a href="#ResampleImage">ResampleImage</a> &bull; <a href="#LiquidRescaleImage">LiquidRescaleImage</a> &bull; <a href="#ResizeImage">ResizeImage</a> &bull; <a href="#SampleImage">SampleImage</a> &bull; <a href="#ScaleImage">ScaleImage</a> &bull; <a href="#ThumbnailImage">ThumbnailImage</a>]</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]210
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]211<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="AdaptiveResizeImage">AdaptiveResizeImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]212<div class="doc-section">
213
214<p>AdaptiveResizeImage() adaptively resize image with pixel resampling.</p>
215
216<p>The format of the AdaptiveResizeImage method is:</p>
217
218<pre class="code">
219 Image *AdaptiveResizeImage(const Image *image,const size_t columns,
220 const size_t rows,ExceptionInfo *exception)
221</pre>
222
223<p>A description of each parameter follows:</p>
224
225<h5>image</h5>
226<p>the image.</p>
227
228<h5>columns</h5>
229<p>the number of columns in the resized image.</p>
230
231<h5>rows</h5>
232<p>the number of rows in the resized image.</p>
233
234<h5>exception</h5>
235<p>return any errors or warnings in this structure.</p>
236
237 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]238<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="MagnifyImage">MagnifyImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]239<div class="doc-section">
240
241<p>MagnifyImage() is a convenience method that scales an image proportionally to twice its size.</p>
242
243<p>The format of the MagnifyImage method is:</p>
244
245<pre class="code">
246 Image *MagnifyImage(const Image *image,ExceptionInfo *exception)
247</pre>
248
249<p>A description of each parameter follows:</p>
250
251<h5>image</h5>
252<p>the image.</p>
253
254<h5>exception</h5>
255<p>return any errors or warnings in this structure.</p>
256
257 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]258<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="MinifyImage">MinifyImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]259<div class="doc-section">
260
261<p>MinifyImage() is a convenience method that scales an image proportionally to half its size.</p>
262
263<p>The format of the MinifyImage method is:</p>
264
265<pre class="code">
266 Image *MinifyImage(const Image *image,ExceptionInfo *exception)
267</pre>
268
269<p>A description of each parameter follows:</p>
270
271<h5>image</h5>
272<p>the image.</p>
273
274<h5>exception</h5>
275<p>return any errors or warnings in this structure.</p>
276
277 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]278<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="ResampleImage">ResampleImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]279<div class="doc-section">
280
281<p>ResampleImage() resize image in terms of its pixel size, so that when displayed at the given resolution it will be the same size in terms of real world units as the original image at the original resolution.</p>
282
283<p>The format of the ResampleImage method is:</p>
284
285<pre class="code">
286 Image *ResampleImage(Image *image,const double x_resolution,
287 const double y_resolution,const FilterTypes filter,const double blur,
288 ExceptionInfo *exception)
289</pre>
290
291<p>A description of each parameter follows:</p>
292
293<h5>image</h5>
294<p>the image to be resized to fit the given resolution.</p>
295
296<h5>x_resolution</h5>
297<p>the new image x resolution.</p>
298
299<h5>y_resolution</h5>
300<p>the new image y resolution.</p>
301
302<h5>filter</h5>
303<p>Image filter to use.</p>
304
305<h5>blur</h5>
306<p>the blur factor where > 1 is blurry, < 1 is sharp.</p>
307
308 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]309<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="LiquidRescaleImage">LiquidRescaleImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]310<div class="doc-section">
311
312<p>LiquidRescaleImage() rescales image with seam carving.</p>
313
314<p>The format of the LiquidRescaleImage method is:</p>
315
316<pre class="code">
317 Image *LiquidRescaleImage(const Image *image,
318 const size_t columns,const size_t rows,
319 const double delta_x,const double rigidity,ExceptionInfo *exception)
320</pre>
321
322<p>A description of each parameter follows:</p>
323
324<h5>image</h5>
325<p>the image.</p>
326
327<h5>columns</h5>
328<p>the number of columns in the rescaled image.</p>
329
330<h5>rows</h5>
331<p>the number of rows in the rescaled image.</p>
332
333<h5>delta_x</h5>
334<p>maximum seam transversal step (0 means straight seams).</p>
335
336<h5>rigidity</h5>
337<p>introduce a bias for non-straight seams (typically 0).</p>
338
339<h5>exception</h5>
340<p>return any errors or warnings in this structure.</p>
341
342 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]343<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="ResizeImage">ResizeImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]344<div class="doc-section">
345
346<p>ResizeImage() scales an image to the desired dimensions, using the given filter (see AcquireFilterInfo()).</p>
347
348<p>If an undefined filter is given the filter defaults to Mitchell for a colormapped image, a image with a matte channel, or if the image is enlarged. Otherwise the filter defaults to a Lanczos.</p>
349
350<p>ResizeImage() was inspired by Paul Heckbert's "zoom" program.</p>
351
352<p>The format of the ResizeImage method is:</p>
353
354<pre class="code">
355 Image *ResizeImage(Image *image,const size_t columns,
356 const size_t rows,const FilterTypes filter,const double blur,
357 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>columns</h5>
366<p>the number of columns in the scaled image.</p>
367
368<h5>rows</h5>
369<p>the number of rows in the scaled image.</p>
370
371<h5>filter</h5>
372<p>Image filter to use.</p>
373
374<h5>blur</h5>
375<p>the blur factor where > 1 is blurry, < 1 is sharp. Typically set this to 1.0.</p>
376
377<h5>exception</h5>
378<p>return any errors or warnings in this structure.</p>
379
380 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]381<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="SampleImage">SampleImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]382<div class="doc-section">
383
384<p>SampleImage() scales an image to the desired dimensions with pixel sampling. Unlike other scaling methods, this method does not introduce any additional color into the scaled image.</p>
385
386<p>The format of the SampleImage method is:</p>
387
388<pre class="code">
389 Image *SampleImage(const Image *image,const size_t columns,
390 const size_t rows,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>columns</h5>
399<p>the number of columns in the sampled image.</p>
400
401<h5>rows</h5>
402<p>the number of rows in the sampled image.</p>
403
404<h5>exception</h5>
405<p>return any errors or warnings in this structure.</p>
406
407 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]408<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="ScaleImage">ScaleImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]409<div class="doc-section">
410
411<p>ScaleImage() changes the size of an image to the given dimensions.</p>
412
413<p>The format of the ScaleImage method is:</p>
414
415<pre class="code">
416 Image *ScaleImage(const Image *image,const size_t columns,
417 const size_t rows,ExceptionInfo *exception)
418</pre>
419
420<p>A description of each parameter follows:</p>
421
422<h5>image</h5>
423<p>the image.</p>
424
425<h5>columns</h5>
426<p>the number of columns in the scaled image.</p>
427
428<h5>rows</h5>
429<p>the number of rows in the scaled image.</p>
430
431<h5>exception</h5>
432<p>return any errors or warnings in this structure.</p>
433
434 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]435<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="ThumbnailImage">ThumbnailImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]436<div class="doc-section">
437
438<p>ThumbnailImage() changes the size of an image to the given dimensions and removes any associated profiles. The goal is to produce small low cost thumbnail images suited for display on the Web.</p>
439
440<p>The format of the ThumbnailImage method is:</p>
441
442<pre class="code">
443 Image *ThumbnailImage(const Image *image,const size_t columns,
444 const size_t rows,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>columns</h5>
453<p>the number of columns in the scaled image.</p>
454
455<h5>rows</h5>
456<p>the number of rows in the scaled image.</p>
457
458<h5>exception</h5>
459<p>return any errors or warnings in this structure.</p>
460
461 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]462
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