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gerrit-public.fairphone.software / platform / external / ImageMagick / e855cb3f8acc0e1857a1ce2167835d3e63f80dc0 / . / www / api / resize.html
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cristy307ba182010-12-25 01:00:34 +0000[diff] [blame]178<h1>Module resize
179 Methods</h1>
cristy73fd1cd2010-09-12 19:14:25 +0000[diff] [blame]180<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]181
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]182<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/resize
183_8c.html" id="AdaptiveResizeImage">AdaptiveResizeImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]184<div class="doc-section">
185
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]186<p>AdaptiveResizeImage() adaptively resize image with pixel resampling.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]187
188<p>The format of the AdaptiveResizeImage method is:</p>
189
190<pre class="code">
cristybc9539a2010-08-16 18:06:20 +0000[diff] [blame]191 Image *AdaptiveResizeImage(const Image *image,const size_t columns,
192 const size_t rows,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]193</pre>
194
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]195<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]196
197<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]198<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]199
200<h5>columns</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]201<p>the number of columns in the resized image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]202
203<h5>rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]204<p>the number of rows in the resized image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]205
206<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]207<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]208
209 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]210<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/resize
211_8c.html" id="MagnifyImage">MagnifyImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]212<div class="doc-section">
213
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]214<p>MagnifyImage() is a convenience method that scales an image proportionally to twice its size.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]215
216<p>The format of the MagnifyImage method is:</p>
217
218<pre class="code">
219 Image *MagnifyImage(const Image *image,ExceptionInfo *exception)
220</pre>
221
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]222<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]223
224<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]225<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]226
227<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]228<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]229
230 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]231<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/resize
232_8c.html" id="MinifyImage">MinifyImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]233<div class="doc-section">
234
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]235<p>MinifyImage() is a convenience method that scales an image proportionally to half its size.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]236
237<p>The format of the MinifyImage method is:</p>
238
239<pre class="code">
240 Image *MinifyImage(const Image *image,ExceptionInfo *exception)
241</pre>
242
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]243<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]244
245<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]246<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]247
248<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]249<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]250
251 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]252<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/resize
253_8c.html" id="ResampleImage">ResampleImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]254<div class="doc-section">
255
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]256<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]257
258<p>The format of the ResampleImage method is:</p>
259
260<pre class="code">
261 Image *ResampleImage(Image *image,const double x_resolution,
262 const double y_resolution,const FilterTypes filter,const double blur,
263 ExceptionInfo *exception)
264</pre>
265
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]266<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]267
268<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]269<p>the image to be resized to fit the given resolution.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]270
271<h5>x_resolution</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]272<p>the new image x resolution.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]273
274<h5>y_resolution</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]275<p>the new image y resolution.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]276
277<h5>filter</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]278<p>Image filter to use.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]279
280<h5>blur</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]281<p>the blur factor where > 1 is blurry, < 1 is sharp.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]282
283 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]284<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/resize
285_8c.html" id="LiquidRescaleImage">LiquidRescaleImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]286<div class="doc-section">
287
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]288<p>LiquidRescaleImage() rescales image with seam carving.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]289
290<p>The format of the LiquidRescaleImage method is:</p>
291
292<pre class="code">
293 Image *LiquidRescaleImage(const Image *image,
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]294 const size_t columns,const size_t rows,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]295 const double delta_x,const double rigidity,ExceptionInfo *exception)
296</pre>
297
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]298<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]299
300<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]301<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]302
303<h5>columns</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]304<p>the number of columns in the rescaled image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]305
306<h5>rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]307<p>the number of rows in the rescaled image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]308
309<h5>delta_x</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]310<p>maximum seam transversal step (0 means straight seams).</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]311
312<h5>rigidity</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]313<p>introduce a bias for non-straight seams (typically 0).</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]314
315<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]316<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]317
318 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]319<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/resize
320_8c.html" id="ResizeImage">ResizeImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]321<div class="doc-section">
322
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]323<p>ResizeImage() scales an image to the desired dimensions, using the given filter (see AcquireFilterInfo()).</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]324
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]325<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]326
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]327<p>ResizeImage() was inspired by Paul Heckbert's "zoom" program.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]328
329<p>The format of the ResizeImage method is:</p>
330
331<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]332 Image *ResizeImage(Image *image,const size_t columns,
333 const size_t rows,const FilterTypes filter,const double blur,
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]334 ExceptionInfo *exception)
335</pre>
336
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]337<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]338
339<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]340<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]341
342<h5>columns</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]343<p>the number of columns in the scaled image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]344
345<h5>rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]346<p>the number of rows in the scaled image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]347
348<h5>filter</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]349<p>Image filter to use.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]350
351<h5>blur</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]352<p>the blur factor where > 1 is blurry, < 1 is sharp. Typically set this to 1.0.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]353
354<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]355<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]356
357 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]358<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/resize
359_8c.html" id="SampleImage">SampleImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]360<div class="doc-section">
361
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]362<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]363
364<p>The format of the SampleImage method is:</p>
365
366<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]367 Image *SampleImage(const Image *image,const size_t columns,
368 const size_t rows,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]369</pre>
370
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]371<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]372
373<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]374<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]375
376<h5>columns</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]377<p>the number of columns in the sampled image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]378
379<h5>rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]380<p>the number of rows in the sampled image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]381
382<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]383<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]384
385 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]386<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/resize
387_8c.html" id="ScaleImage">ScaleImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]388<div class="doc-section">
389
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]390<p>ScaleImage() changes the size of an image to the given dimensions.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]391
392<p>The format of the ScaleImage method is:</p>
393
394<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]395 Image *ScaleImage(const Image *image,const size_t columns,
396 const size_t rows,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]397</pre>
398
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]399<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]400
401<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]402<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]403
404<h5>columns</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]405<p>the number of columns in the scaled image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]406
407<h5>rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]408<p>the number of rows in the scaled image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]409
410<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]411<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]412
413 </div>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]414<h2><a href="http://www.wizards-toolkit.org/api/MagickCore/resize
415_8c.html" id="ThumbnailImage">ThumbnailImage</a></h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]416<div class="doc-section">
417
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]418<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]419
420<p>The format of the ThumbnailImage method is:</p>
421
422<pre class="code">
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]423 Image *ThumbnailImage(const Image *image,const size_t columns,
424 const size_t rows,ExceptionInfo *exception)
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]425</pre>
426
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]427<p>A description of each parameter follows:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]428
429<h5>image</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]430<p>the image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]431
432<h5>columns</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]433<p>the number of columns in the scaled image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]434
435<h5>rows</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]436<p>the number of rows in the scaled image.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]437
438<h5>exception</h5>
cristy7a40ba82011-01-08 20:31:18 +0000[diff] [blame]439<p>return any errors or warnings in this structure.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]440
441 </div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]442
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