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11 <title>ImageMagick: MagickCore, C API for ImageMagick: Resize an Image</title>
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154 <p class="navigation-index">[<a href="#AdaptiveResizeImage">AdaptiveResizeImage</a> • <a href="#MagnifyImage">MagnifyImage</a> • <a href="#MinifyImage">MinifyImage</a> • <a href="#ResampleImage">ResampleImage</a> • <a href="#LiquidRescaleImage">LiquidRescaleImage</a> • <a href="#ResizeImage">ResizeImage</a> • <a href="#SampleImage">SampleImage</a> • <a href="#ScaleImage">ScaleImage</a> • <a href="#ThumbnailImage">ThumbnailImage</a> • <a href="#ZoomImage">ZoomImage</a>]</p>
156 <h2><a href="http://www.imagemagick.org/api/MagickCore/resize
157 _8c.html" target="source" name="AdaptiveResizeImage">AdaptiveResizeImage</a></h2>
158 <div class="doc-section">
160 <p>AdaptiveResizeImage() adaptively resize image with pixel resampling.</p></ol>
162 <p>The format of the AdaptiveResizeImage method is:</p>
165 Image *AdaptiveResizeImage(const Image *image,
166 const unsigned long columns,const unsigned long rows,
167 ExceptionInfo *exception)
170 <p>A description of each parameter follows:</p></ol>
173 <ol><p>the image.</p></ol>
176 <ol><p>the number of columns in the resized image.</p></ol>
179 <ol><p>the number of rows in the resized image.</p></ol>
182 <ol><p>return any errors or warnings in this structure.</p></ol>
185 <h2><a href="http://www.imagemagick.org/api/MagickCore/resize
186 _8c.html" target="source" name="MagnifyImage">MagnifyImage</a></h2>
187 <div class="doc-section">
189 <p>MagnifyImage() is a convenience method that scales an image proportionally to twice its size.</p></ol>
191 <p>The format of the MagnifyImage method is:</p>
194 Image *MagnifyImage(const Image *image,ExceptionInfo *exception)
197 <p>A description of each parameter follows:</p></ol>
200 <ol><p>the image.</p></ol>
203 <ol><p>return any errors or warnings in this structure.</p></ol>
206 <h2><a href="http://www.imagemagick.org/api/MagickCore/resize
207 _8c.html" target="source" name="MinifyImage">MinifyImage</a></h2>
208 <div class="doc-section">
210 <p>MinifyImage() is a convenience method that scales an image proportionally to half its size.</p></ol>
212 <p>The format of the MinifyImage method is:</p>
215 Image *MinifyImage(const Image *image,ExceptionInfo *exception)
218 <p>A description of each parameter follows:</p></ol>
221 <ol><p>the image.</p></ol>
224 <ol><p>return any errors or warnings in this structure.</p></ol>
227 <h2><a href="http://www.imagemagick.org/api/MagickCore/resize
228 _8c.html" target="source" name="ResampleImage">ResampleImage</a></h2>
229 <div class="doc-section">
231 <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></ol>
233 <p>The format of the ResampleImage method is:</p>
236 Image *ResampleImage(Image *image,const double x_resolution,
237 const double y_resolution,const FilterTypes filter,const double blur,
238 ExceptionInfo *exception)
241 <p>A description of each parameter follows:</p></ol>
244 <ol><p>the image to be resized to fit the given resolution.</p></ol>
246 <h5>x_resolution</h5>
247 <ol><p>the new image x resolution.</p></ol>
249 <h5>y_resolution</h5>
250 <ol><p>the new image y resolution.</p></ol>
253 <ol><p>Image filter to use.</p></ol>
256 <ol><p>the blur factor where > 1 is blurry, < 1 is sharp.</p></ol>
259 <h2><a href="http://www.imagemagick.org/api/MagickCore/resize
260 _8c.html" target="source" name="LiquidRescaleImage">LiquidRescaleImage</a></h2>
261 <div class="doc-section">
263 <p>LiquidRescaleImage() rescales image with seam carving.</p></ol>
265 <p>The format of the LiquidRescaleImage method is:</p>
268 Image *LiquidRescaleImage(const Image *image,
269 const unsigned long columns,const unsigned long rows,
270 const double delta_x,const double rigidity,ExceptionInfo *exception)
273 <p>A description of each parameter follows:</p></ol>
276 <ol><p>the image.</p></ol>
279 <ol><p>the number of columns in the rescaled image.</p></ol>
282 <ol><p>the number of rows in the rescaled image.</p></ol>
285 <ol><p>maximum seam transversal step (0 means straight seams).</p></ol>
288 <ol><p>introduce a bias for non-straight seams (typically 0).</p></ol>
291 <ol><p>return any errors or warnings in this structure.</p></ol>
294 <h2><a href="http://www.imagemagick.org/api/MagickCore/resize
295 _8c.html" target="source" name="ResizeImage">ResizeImage</a></h2>
296 <div class="doc-section">
298 <p>ResizeImage() scales an image to the desired dimensions, using the given filter (see AcquireFilterInfo() ).</p></ol>
300 <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></ol>
302 <p>ResizeImage() was inspired by Paul Heckbert's "zoom" program.</p></ol>
304 <p>The format of the ResizeImage method is:</p>
307 Image *ResizeImage(Image *image,const unsigned long columns,
308 const unsigned long rows,const FilterTypes filter,const double blur,
309 ExceptionInfo *exception)
312 <p>A description of each parameter follows:</p></ol>
315 <ol><p>the image.</p></ol>
318 <ol><p>the number of columns in the scaled image.</p></ol>
321 <ol><p>the number of rows in the scaled image.</p></ol>
324 <ol><p>Image filter to use.</p></ol>
327 <ol><p>the blur factor where > 1 is blurry, < 1 is sharp. Typically set this to 1.0.</p></ol>
330 <ol><p>return any errors or warnings in this structure.</p></ol>
333 <h2><a href="http://www.imagemagick.org/api/MagickCore/resize
334 _8c.html" target="source" name="SampleImage">SampleImage</a></h2>
335 <div class="doc-section">
337 <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></ol>
339 <p>The format of the SampleImage method is:</p>
342 Image *SampleImage(const Image *image,const unsigned long columns,
343 const unsigned long rows,ExceptionInfo *exception)
346 <p>A description of each parameter follows:</p></ol>
349 <ol><p>the image.</p></ol>
352 <ol><p>the number of columns in the sampled image.</p></ol>
355 <ol><p>the number of rows in the sampled image.</p></ol>
358 <ol><p>return any errors or warnings in this structure.</p></ol>
361 <h2><a href="http://www.imagemagick.org/api/MagickCore/resize
362 _8c.html" target="source" name="ScaleImage">ScaleImage</a></h2>
363 <div class="doc-section">
365 <p>ScaleImage() changes the size of an image to the given dimensions.</p></ol>
367 <p>The format of the ScaleImage method is:</p>
370 Image *ScaleImage(const Image *image,const unsigned long columns,
371 const unsigned long rows,ExceptionInfo *exception)
374 <p>A description of each parameter follows:</p></ol>
377 <ol><p>the image.</p></ol>
380 <ol><p>the number of columns in the scaled image.</p></ol>
383 <ol><p>the number of rows in the scaled image.</p></ol>
386 <ol><p>return any errors or warnings in this structure.</p></ol>
389 <h2><a href="http://www.imagemagick.org/api/MagickCore/resize
390 _8c.html" target="source" name="ThumbnailImage">ThumbnailImage</a></h2>
391 <div class="doc-section">
393 <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></ol>
395 <p>The format of the ThumbnailImage method is:</p>
398 Image *ThumbnailImage(const Image *image,const unsigned long columns,
399 const unsigned long rows,ExceptionInfo *exception)
402 <p>A description of each parameter follows:</p></ol>
405 <ol><p>the image.</p></ol>
408 <ol><p>the number of columns in the scaled image.</p></ol>
411 <ol><p>the number of rows in the scaled image.</p></ol>
414 <ol><p>return any errors or warnings in this structure.</p></ol>
417 <h2><a href="http://www.imagemagick.org/api/MagickCore/resize
418 _8c.html" target="source" name="ZoomImage">ZoomImage</a></h2>
419 <div class="doc-section">
421 <p>ZoomImage() creates a new image that is a scaled size of an existing one. It allocates the memory necessary for the new Image structure and returns a pointer to the new image. The Point filter gives fast pixel replication, Triangle is equivalent to bi-linear interpolation, and Mitchel giver slower, very high-quality results. See Graphic Gems III for details on this algorithm.</p></ol>
423 <p>The filter member of the Image structure specifies which image filter to use. Blur specifies the blur factor where > 1 is blurry, < 1 is sharp.</p></ol>
425 <p>The format of the ZoomImage method is:</p>
428 Image *ZoomImage(const Image *image,const unsigned long columns,
429 const unsigned long rows,ExceptionInfo *exception)
432 <p>A description of each parameter follows:</p></ol>
435 <ol><p>the image.</p></ol>
438 <ol><p>An integer that specifies the number of columns in the zoom image.</p></ol>
441 <ol><p>An integer that specifies the number of rows in the scaled image.</p></ol>
444 <ol><p>return any errors or warnings in this structure.</p></ol>
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