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gerrit-public.fairphone.software / platform / external / ImageMagick / 68169a5b02e5d2b36003f4cc0db02a8fabf26c77 / . / www / api / resize.html
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212<div class="main">
213
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]214<h1>Module resize Methods</h1>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]215<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]216
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]217<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]218<div class="doc-section">
219
220<p>AdaptiveResizeImage() adaptively resize image with pixel resampling.</p>
221
222<p>The format of the AdaptiveResizeImage method is:</p>
223
224<pre class="code">
225 Image *AdaptiveResizeImage(const Image *image,const size_t columns,
226 const size_t rows,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>columns</h5>
235<p>the number of columns in the resized image.</p>
236
237<h5>rows</h5>
238<p>the number of rows in the resized image.</p>
239
240<h5>exception</h5>
241<p>return any errors or warnings in this structure.</p>
242
243 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]244<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]245<div class="doc-section">
246
247<p>MagnifyImage() is a convenience method that scales an image proportionally to twice its size.</p>
248
249<p>The format of the MagnifyImage method is:</p>
250
251<pre class="code">
252 Image *MagnifyImage(const Image *image,ExceptionInfo *exception)
253</pre>
254
255<p>A description of each parameter follows:</p>
256
257<h5>image</h5>
258<p>the image.</p>
259
260<h5>exception</h5>
261<p>return any errors or warnings in this structure.</p>
262
263 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]264<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]265<div class="doc-section">
266
267<p>MinifyImage() is a convenience method that scales an image proportionally to half its size.</p>
268
269<p>The format of the MinifyImage method is:</p>
270
271<pre class="code">
272 Image *MinifyImage(const Image *image,ExceptionInfo *exception)
273</pre>
274
275<p>A description of each parameter follows:</p>
276
277<h5>image</h5>
278<p>the image.</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/resize_8c.html" id="ResampleImage">ResampleImage</a></h2>
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame]285<div class="doc-section">
286
287<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>
288
289<p>The format of the ResampleImage method is:</p>
290
291<pre class="code">
292 Image *ResampleImage(Image *image,const double x_resolution,
293 const double y_resolution,const FilterTypes filter,const double blur,
294 ExceptionInfo *exception)
295</pre>
296
297<p>A description of each parameter follows:</p>
298
299<h5>image</h5>
300<p>the image to be resized to fit the given resolution.</p>
301
302<h5>x_resolution</h5>
303<p>the new image x resolution.</p>
304
305<h5>y_resolution</h5>
306<p>the new image y resolution.</p>
307
308<h5>filter</h5>
309<p>Image filter to use.</p>
310
311<h5>blur</h5>
312<p>the blur factor where > 1 is blurry, < 1 is sharp.</p>
313
314 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]315<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]316<div class="doc-section">
317
318<p>LiquidRescaleImage() rescales image with seam carving.</p>
319
320<p>The format of the LiquidRescaleImage method is:</p>
321
322<pre class="code">
323 Image *LiquidRescaleImage(const Image *image,
324 const size_t columns,const size_t rows,
325 const double delta_x,const double rigidity,ExceptionInfo *exception)
326</pre>
327
328<p>A description of each parameter follows:</p>
329
330<h5>image</h5>
331<p>the image.</p>
332
333<h5>columns</h5>
334<p>the number of columns in the rescaled image.</p>
335
336<h5>rows</h5>
337<p>the number of rows in the rescaled image.</p>
338
339<h5>delta_x</h5>
340<p>maximum seam transversal step (0 means straight seams).</p>
341
342<h5>rigidity</h5>
343<p>introduce a bias for non-straight seams (typically 0).</p>
344
345<h5>exception</h5>
346<p>return any errors or warnings in this structure.</p>
347
348 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]349<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]350<div class="doc-section">
351
352<p>ResizeImage() scales an image to the desired dimensions, using the given filter (see AcquireFilterInfo()).</p>
353
354<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>
355
356<p>ResizeImage() was inspired by Paul Heckbert's "zoom" program.</p>
357
358<p>The format of the ResizeImage method is:</p>
359
360<pre class="code">
361 Image *ResizeImage(Image *image,const size_t columns,
362 const size_t rows,const FilterTypes filter,const double blur,
363 ExceptionInfo *exception)
364</pre>
365
366<p>A description of each parameter follows:</p>
367
368<h5>image</h5>
369<p>the image.</p>
370
371<h5>columns</h5>
372<p>the number of columns in the scaled image.</p>
373
374<h5>rows</h5>
375<p>the number of rows in the scaled image.</p>
376
377<h5>filter</h5>
378<p>Image filter to use.</p>
379
380<h5>blur</h5>
381<p>the blur factor where > 1 is blurry, < 1 is sharp. Typically set this to 1.0.</p>
382
383<h5>exception</h5>
384<p>return any errors or warnings in this structure.</p>
385
386 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]387<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]388<div class="doc-section">
389
390<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>
391
392<p>The format of the SampleImage method is:</p>
393
394<pre class="code">
395 Image *SampleImage(const Image *image,const size_t columns,
396 const size_t rows,ExceptionInfo *exception)
397</pre>
398
399<p>A description of each parameter follows:</p>
400
401<h5>image</h5>
402<p>the image.</p>
403
404<h5>columns</h5>
405<p>the number of columns in the sampled image.</p>
406
407<h5>rows</h5>
408<p>the number of rows in the sampled image.</p>
409
410<h5>exception</h5>
411<p>return any errors or warnings in this structure.</p>
412
413 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]414<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]415<div class="doc-section">
416
417<p>ScaleImage() changes the size of an image to the given dimensions.</p>
418
419<p>The format of the ScaleImage method is:</p>
420
421<pre class="code">
422 Image *ScaleImage(const Image *image,const size_t columns,
423 const size_t rows,ExceptionInfo *exception)
424</pre>
425
426<p>A description of each parameter follows:</p>
427
428<h5>image</h5>
429<p>the image.</p>
430
431<h5>columns</h5>
432<p>the number of columns in the scaled image.</p>
433
434<h5>rows</h5>
435<p>the number of rows in the scaled image.</p>
436
437<h5>exception</h5>
438<p>return any errors or warnings in this structure.</p>
439
440 </div>
cristy350dea42011-02-15 17:31:04 +0000[diff] [blame]441<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]442<div class="doc-section">
443
444<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>
445
446<p>The format of the ThumbnailImage method is:</p>
447
448<pre class="code">
449 Image *ThumbnailImage(const Image *image,const size_t columns,
450 const size_t rows,ExceptionInfo *exception)
451</pre>
452
453<p>A description of each parameter follows:</p>
454
455<h5>image</h5>
456<p>the image.</p>
457
458<h5>columns</h5>
459<p>the number of columns in the scaled image.</p>
460
461<h5>rows</h5>
462<p>the number of rows in the scaled image.</p>
463
464<h5>exception</h5>
465<p>return any errors or warnings in this structure.</p>
466
467 </div>
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