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gerrit-public.fairphone.software / platform / external / ImageMagick / 6f77f6996510a6f454a688320ba2095c1df56b82 / . / www / api / resize.html
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192
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame^]193<h1>Module resize
194 Methods</h1>
195<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]196
cristy6f77f692011-02-15 15:31:39 +0000[diff] [blame^]197<h2><a href="http://www.imagemagick.org/api/MagickCore/resize
198_8c.html" id="AdaptiveResizeImage">AdaptiveResizeImage</a></h2>
199<div class="doc-section">
200
201<p>AdaptiveResizeImage() adaptively resize image with pixel resampling.</p>
202
203<p>The format of the AdaptiveResizeImage method is:</p>
204
205<pre class="code">
206 Image *AdaptiveResizeImage(const Image *image,const size_t columns,
207 const size_t rows,ExceptionInfo *exception)
208</pre>
209
210<p>A description of each parameter follows:</p>
211
212<h5>image</h5>
213<p>the image.</p>
214
215<h5>columns</h5>
216<p>the number of columns in the resized image.</p>
217
218<h5>rows</h5>
219<p>the number of rows in the resized image.</p>
220
221<h5>exception</h5>
222<p>return any errors or warnings in this structure.</p>
223
224 </div>
225<h2><a href="http://www.imagemagick.org/api/MagickCore/resize
226_8c.html" id="MagnifyImage">MagnifyImage</a></h2>
227<div class="doc-section">
228
229<p>MagnifyImage() is a convenience method that scales an image proportionally to twice its size.</p>
230
231<p>The format of the MagnifyImage method is:</p>
232
233<pre class="code">
234 Image *MagnifyImage(const Image *image,ExceptionInfo *exception)
235</pre>
236
237<p>A description of each parameter follows:</p>
238
239<h5>image</h5>
240<p>the image.</p>
241
242<h5>exception</h5>
243<p>return any errors or warnings in this structure.</p>
244
245 </div>
246<h2><a href="http://www.imagemagick.org/api/MagickCore/resize
247_8c.html" id="MinifyImage">MinifyImage</a></h2>
248<div class="doc-section">
249
250<p>MinifyImage() is a convenience method that scales an image proportionally to half its size.</p>
251
252<p>The format of the MinifyImage method is:</p>
253
254<pre class="code">
255 Image *MinifyImage(const Image *image,ExceptionInfo *exception)
256</pre>
257
258<p>A description of each parameter follows:</p>
259
260<h5>image</h5>
261<p>the image.</p>
262
263<h5>exception</h5>
264<p>return any errors or warnings in this structure.</p>
265
266 </div>
267<h2><a href="http://www.imagemagick.org/api/MagickCore/resize
268_8c.html" id="ResampleImage">ResampleImage</a></h2>
269<div class="doc-section">
270
271<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>
272
273<p>The format of the ResampleImage method is:</p>
274
275<pre class="code">
276 Image *ResampleImage(Image *image,const double x_resolution,
277 const double y_resolution,const FilterTypes filter,const double blur,
278 ExceptionInfo *exception)
279</pre>
280
281<p>A description of each parameter follows:</p>
282
283<h5>image</h5>
284<p>the image to be resized to fit the given resolution.</p>
285
286<h5>x_resolution</h5>
287<p>the new image x resolution.</p>
288
289<h5>y_resolution</h5>
290<p>the new image y resolution.</p>
291
292<h5>filter</h5>
293<p>Image filter to use.</p>
294
295<h5>blur</h5>
296<p>the blur factor where > 1 is blurry, < 1 is sharp.</p>
297
298 </div>
299<h2><a href="http://www.imagemagick.org/api/MagickCore/resize
300_8c.html" id="LiquidRescaleImage">LiquidRescaleImage</a></h2>
301<div class="doc-section">
302
303<p>LiquidRescaleImage() rescales image with seam carving.</p>
304
305<p>The format of the LiquidRescaleImage method is:</p>
306
307<pre class="code">
308 Image *LiquidRescaleImage(const Image *image,
309 const size_t columns,const size_t rows,
310 const double delta_x,const double rigidity,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>columns</h5>
319<p>the number of columns in the rescaled image.</p>
320
321<h5>rows</h5>
322<p>the number of rows in the rescaled image.</p>
323
324<h5>delta_x</h5>
325<p>maximum seam transversal step (0 means straight seams).</p>
326
327<h5>rigidity</h5>
328<p>introduce a bias for non-straight seams (typically 0).</p>
329
330<h5>exception</h5>
331<p>return any errors or warnings in this structure.</p>
332
333 </div>
334<h2><a href="http://www.imagemagick.org/api/MagickCore/resize
335_8c.html" id="ResizeImage">ResizeImage</a></h2>
336<div class="doc-section">
337
338<p>ResizeImage() scales an image to the desired dimensions, using the given filter (see AcquireFilterInfo()).</p>
339
340<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>
341
342<p>ResizeImage() was inspired by Paul Heckbert's "zoom" program.</p>
343
344<p>The format of the ResizeImage method is:</p>
345
346<pre class="code">
347 Image *ResizeImage(Image *image,const size_t columns,
348 const size_t rows,const FilterTypes filter,const double blur,
349 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>columns</h5>
358<p>the number of columns in the scaled image.</p>
359
360<h5>rows</h5>
361<p>the number of rows in the scaled image.</p>
362
363<h5>filter</h5>
364<p>Image filter to use.</p>
365
366<h5>blur</h5>
367<p>the blur factor where > 1 is blurry, < 1 is sharp. Typically set this to 1.0.</p>
368
369<h5>exception</h5>
370<p>return any errors or warnings in this structure.</p>
371
372 </div>
373<h2><a href="http://www.imagemagick.org/api/MagickCore/resize
374_8c.html" id="SampleImage">SampleImage</a></h2>
375<div class="doc-section">
376
377<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>
378
379<p>The format of the SampleImage method is:</p>
380
381<pre class="code">
382 Image *SampleImage(const Image *image,const size_t columns,
383 const size_t rows,ExceptionInfo *exception)
384</pre>
385
386<p>A description of each parameter follows:</p>
387
388<h5>image</h5>
389<p>the image.</p>
390
391<h5>columns</h5>
392<p>the number of columns in the sampled image.</p>
393
394<h5>rows</h5>
395<p>the number of rows in the sampled image.</p>
396
397<h5>exception</h5>
398<p>return any errors or warnings in this structure.</p>
399
400 </div>
401<h2><a href="http://www.imagemagick.org/api/MagickCore/resize
402_8c.html" id="ScaleImage">ScaleImage</a></h2>
403<div class="doc-section">
404
405<p>ScaleImage() changes the size of an image to the given dimensions.</p>
406
407<p>The format of the ScaleImage method is:</p>
408
409<pre class="code">
410 Image *ScaleImage(const Image *image,const size_t columns,
411 const size_t rows,ExceptionInfo *exception)
412</pre>
413
414<p>A description of each parameter follows:</p>
415
416<h5>image</h5>
417<p>the image.</p>
418
419<h5>columns</h5>
420<p>the number of columns in the scaled image.</p>
421
422<h5>rows</h5>
423<p>the number of rows in the scaled image.</p>
424
425<h5>exception</h5>
426<p>return any errors or warnings in this structure.</p>
427
428 </div>
429<h2><a href="http://www.imagemagick.org/api/MagickCore/resize
430_8c.html" id="ThumbnailImage">ThumbnailImage</a></h2>
431<div class="doc-section">
432
433<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>
434
435<p>The format of the ThumbnailImage method is:</p>
436
437<pre class="code">
438 Image *ThumbnailImage(const Image *image,const size_t columns,
439 const size_t rows,ExceptionInfo *exception)
440</pre>
441
442<p>A description of each parameter follows:</p>
443
444<h5>image</h5>
445<p>the image.</p>
446
447<h5>columns</h5>
448<p>the number of columns in the scaled image.</p>
449
450<h5>rows</h5>
451<p>the number of rows in the scaled image.</p>
452
453<h5>exception</h5>
454<p>return any errors or warnings in this structure.</p>
455
456 </div>
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