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gerrit-public.fairphone.software / platform / external / ImageMagick / ea2793ef7733b63d12c11557fd09df2f1062d61f / . / www / api / resize.html
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cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]59<p class="text-center"><a href="resize.html#AdaptiveResizeImage">AdaptiveResizeImage</a> • <a href="resize.html#InterpolativeResizeImage">InterpolativeResizeImage</a> • <a href="resize.html#LiquidRescaleImage">LiquidRescaleImage</a> • <a href="resize.html#MagnifyImage">MagnifyImage</a> • <a href="resize.html#MinifyImage">MinifyImage</a> • <a href="resize.html#ResampleImage">ResampleImage</a> • <a href="resize.html#ResizeImage">ResizeImage</a> • <a href="resize.html#SampleImage">SampleImage</a> • <a href="resize.html#ScaleImage">ScaleImage</a> • <a href="resize.html#ThumbnailImage">ThumbnailImage</a></p>
cristy06f63f22012-10-31 00:50:07 +0000[diff] [blame]60
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]61<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="AdaptiveResizeImage">AdaptiveResizeImage</a></h2>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]62
63<p>AdaptiveResizeImage() adaptively resize image with pixel resampling.</p>
64
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]65<p>This is shortcut function for a fast interpolative resize using mesh interpolation. It works well for small resizes of less than +/- 50 of the original image size. For larger resizing on images a full filtered and slower resize function should be used instead.</p>
66
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]67<p>The format of the AdaptiveResizeImage method is:</p>
68
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]69<pre class="text">
70Image *AdaptiveResizeImage(const Image *image,const size_t columns,
71 const size_t rows,ExceptionInfo *exception)
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]72</pre>
73
74<p>A description of each parameter follows:</p>
75
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]76<dd>
77</dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]78
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]79<dd> </dd>
80<dl class="dl-horizontal">
81<dt>image</dt>
82<dd>the image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]83
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]84<dd> </dd>
85<dt>columns</dt>
86<dd>the number of columns in the resized image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]87
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]88<dd> </dd>
89<dt>rows</dt>
90<dd>the number of rows in the resized image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]91
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]92<dd> </dd>
93<dt>exception</dt>
94<dd>return any errors or warnings in this structure. </dd>
95
96<dd> </dd>
97</dl>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]98<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="InterpolativeResizeImage">InterpolativeResizeImage</a></h2>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]99
100<p>InterpolativeResizeImage() resizes an image using the specified interpolation method.</p>
101
102<p>The format of the InterpolativeResizeImage method is:</p>
103
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]104<pre class="text">
105Image *InterpolativeResizeImage(const Image *image,const size_t columns,
cristy82a2ff22015-05-12 16:41:32 +0000[diff] [blame]106 const size_t rows,const InterpolatePixelMethod method,
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]107 ExceptionInfo *exception)
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]108</pre>
109
110<p>A description of each parameter follows:</p>
111
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]112<dd>
113</dd>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]114
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]115<dd> </dd>
116<dl class="dl-horizontal">
117<dt>image</dt>
118<dd>the image. </dd>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]119
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]120<dd> </dd>
121<dt>columns</dt>
122<dd>the number of columns in the resized image. </dd>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]123
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]124<dd> </dd>
125<dt>rows</dt>
126<dd>the number of rows in the resized image. </dd>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]127
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]128<dd> </dd>
129<dt>method</dt>
130<dd>the pixel interpolation method. </dd>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]131
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]132<dd> </dd>
133<dt>exception</dt>
134<dd>return any errors or warnings in this structure. </dd>
135
136<dd> </dd>
137</dl>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]138<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="LiquidRescaleImage">LiquidRescaleImage</a></h2>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]139
140<p>LiquidRescaleImage() rescales image with seam carving.</p>
141
142<p>The format of the LiquidRescaleImage method is:</p>
143
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]144<pre class="text">
cristy82a2ff22015-05-12 16:41:32 +0000[diff] [blame]145Image *LiquidRescaleImage(const Image *image,
146 const size_t columns,const size_t rows,
147 const double delta_x,const double rigidity,ExceptionInfo *exception)
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]148</pre>
149
150<p>A description of each parameter follows:</p>
151
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]152<dd>
153</dd>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]154
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]155<dd> </dd>
156<dl class="dl-horizontal">
157<dt>image</dt>
158<dd>the image. </dd>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]159
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]160<dd> </dd>
161<dt>columns</dt>
162<dd>the number of columns in the rescaled image. </dd>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]163
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]164<dd> </dd>
165<dt>rows</dt>
166<dd>the number of rows in the rescaled image. </dd>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]167
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]168<dd> </dd>
169<dt>delta_x</dt>
170<dd>maximum seam transversal step (0 means straight seams). </dd>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]171
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]172<dd> </dd>
173<dt>rigidity</dt>
174<dd>introduce a bias for non-straight seams (typically 0). </dd>
cristy72da67d2013-02-24 21:40:48 +0000[diff] [blame]175
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]176<dd> </dd>
177<dt>exception</dt>
178<dd>return any errors or warnings in this structure. </dd>
179
180<dd> </dd>
181</dl>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]182<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="MagnifyImage">MagnifyImage</a></h2>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]183
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]184<p>MagnifyImage() doubles the size of the image with a pixel art scaling algorithm.</p>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]185
186<p>The format of the MagnifyImage method is:</p>
187
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]188<pre class="text">
189Image *MagnifyImage(const Image *image,ExceptionInfo *exception)
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]190</pre>
191
192<p>A description of each parameter follows:</p>
193
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]194<dd>
195</dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]196
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]197<dd> </dd>
198<dl class="dl-horizontal">
199<dt>image</dt>
200<dd>the image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]201
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]202<dd> </dd>
203<dt>exception</dt>
204<dd>return any errors or warnings in this structure. </dd>
205
206<dd> </dd>
207</dl>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]208<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="MinifyImage">MinifyImage</a></h2>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]209
210<p>MinifyImage() is a convenience method that scales an image proportionally to half its size.</p>
211
212<p>The format of the MinifyImage method is:</p>
213
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]214<pre class="text">
215Image *MinifyImage(const Image *image,ExceptionInfo *exception)
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]216</pre>
217
218<p>A description of each parameter follows:</p>
219
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]220<dd>
221</dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]222
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]223<dd> </dd>
224<dl class="dl-horizontal">
225<dt>image</dt>
226<dd>the image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]227
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]228<dd> </dd>
229<dt>exception</dt>
230<dd>return any errors or warnings in this structure. </dd>
231
232<dd> </dd>
233</dl>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]234<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="ResampleImage">ResampleImage</a></h2>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]235
236<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>
237
238<p>The format of the ResampleImage method is:</p>
239
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]240<pre class="text">
241Image *ResampleImage(Image *image,const double x_resolution,
cristy82a2ff22015-05-12 16:41:32 +0000[diff] [blame]242 const double y_resolution,const FilterTypes filter,const double blur,
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]243 ExceptionInfo *exception)
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]244</pre>
245
246<p>A description of each parameter follows:</p>
247
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]248<dd>
249</dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]250
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]251<dd> </dd>
252<dl class="dl-horizontal">
253<dt>image</dt>
254<dd>the image to be resized to fit the given resolution. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]255
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]256<dd> </dd>
257<dt>x_resolution</dt>
258<dd>the new image x resolution. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]259
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]260<dd> </dd>
261<dt>y_resolution</dt>
262<dd>the new image y resolution. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]263
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]264<dd> </dd>
265<dt>filter</dt>
266<dd>Image filter to use. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]267
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]268<dd> </dd>
cristy82a2ff22015-05-12 16:41:32 +0000[diff] [blame]269<dt>blur</dt>
270<dd>the blur factor where &gt; 1 is blurry, &lt; 1 is sharp. </dd>
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]271
272<dd> </dd>
273</dl>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]274<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="ResizeImage">ResizeImage</a></h2>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]275
276<p>ResizeImage() scales an image to the desired dimensions, using the given filter (see AcquireFilterInfo()).</p>
277
278<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>
279
280<p>ResizeImage() was inspired by Paul Heckbert's "zoom" program.</p>
281
282<p>The format of the ResizeImage method is:</p>
283
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]284<pre class="text">
cristy82a2ff22015-05-12 16:41:32 +0000[diff] [blame]285Image *ResizeImage(Image *image,const size_t columns,
286 const size_t rows,const FilterTypes filter,const double blur,
287 ExceptionInfo *exception)
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]288</pre>
289
290<p>A description of each parameter follows:</p>
291
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]292<dd>
293</dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]294
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]295<dd> </dd>
296<dl class="dl-horizontal">
297<dt>image</dt>
298<dd>the image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]299
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]300<dd> </dd>
301<dt>columns</dt>
302<dd>the number of columns in the scaled image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]303
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]304<dd> </dd>
305<dt>rows</dt>
306<dd>the number of rows in the scaled image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]307
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]308<dd> </dd>
309<dt>filter</dt>
310<dd>Image filter to use. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]311
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]312<dd> </dd>
cristy82a2ff22015-05-12 16:41:32 +0000[diff] [blame]313<dt>blur</dt>
314<dd>the blur factor where &gt; 1 is blurry, &lt; 1 is sharp. Typically set this to 1.0. </dd>
315
316<dd> </dd>
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]317<dt>exception</dt>
318<dd>return any errors or warnings in this structure. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]319
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]320<dd> </dd>
321</dl>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]322<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="SampleImage">SampleImage</a></h2>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]323
324<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>
325
326<p>The format of the SampleImage method is:</p>
327
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]328<pre class="text">
329Image *SampleImage(const Image *image,const size_t columns,
330 const size_t rows,ExceptionInfo *exception)
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]331</pre>
332
333<p>A description of each parameter follows:</p>
334
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]335<dd>
336</dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]337
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]338<dd> </dd>
339<dl class="dl-horizontal">
340<dt>image</dt>
341<dd>the image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]342
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]343<dd> </dd>
344<dt>columns</dt>
345<dd>the number of columns in the sampled image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]346
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]347<dd> </dd>
348<dt>rows</dt>
349<dd>the number of rows in the sampled image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]350
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]351<dd> </dd>
352<dt>exception</dt>
353<dd>return any errors or warnings in this structure. </dd>
354
355<dd> </dd>
356</dl>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]357<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="ScaleImage">ScaleImage</a></h2>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]358
359<p>ScaleImage() changes the size of an image to the given dimensions.</p>
360
361<p>The format of the ScaleImage method is:</p>
362
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]363<pre class="text">
364Image *ScaleImage(const Image *image,const size_t columns,
365 const size_t rows,ExceptionInfo *exception)
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]366</pre>
367
368<p>A description of each parameter follows:</p>
369
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]370<dd>
371</dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]372
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]373<dd> </dd>
374<dl class="dl-horizontal">
375<dt>image</dt>
376<dd>the image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]377
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]378<dd> </dd>
379<dt>columns</dt>
380<dd>the number of columns in the scaled image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]381
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]382<dd> </dd>
383<dt>rows</dt>
384<dd>the number of rows in the scaled image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]385
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]386<dd> </dd>
387<dt>exception</dt>
388<dd>return any errors or warnings in this structure. </dd>
389
390<dd> </dd>
391</dl>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]392<h2><a href="http://www.imagemagick.org/api/MagickCore/resize_8c.html" id="ThumbnailImage">ThumbnailImage</a></h2>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]393
394<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>
395
396<p>The format of the ThumbnailImage method is:</p>
397
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]398<pre class="text">
399Image *ThumbnailImage(const Image *image,const size_t columns,
400 const size_t rows,ExceptionInfo *exception)
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]401</pre>
402
403<p>A description of each parameter follows:</p>
404
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]405<dd>
406</dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]407
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]408<dd> </dd>
409<dl class="dl-horizontal">
410<dt>image</dt>
411<dd>the image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]412
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]413<dd> </dd>
414<dt>columns</dt>
415<dd>the number of columns in the scaled image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]416
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]417<dd> </dd>
418<dt>rows</dt>
419<dd>the number of rows in the scaled image. </dd>
cristy20398432011-08-11 01:31:50 +0000[diff] [blame]420
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]421<dd> </dd>
422<dt>exception</dt>
423<dd>return any errors or warnings in this structure. </dd>
cristy06f63f22012-10-31 00:50:07 +0000[diff] [blame]424
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]425<dd> </dd>
426</dl>
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