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12 <title>ImageMagick: MagickCore, C API for ImageMagick: Transform an Image</title>
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152 <p class="navigation-index">[<a href="#ChopImage">ChopImage</a> • <a href="#CropImage">CropImage</a> • <a href="#ExcerptImage">ExcerptImage</a> • <a href="#ExtentImage">ExtentImage</a> • <a href="#FlipImage">FlipImage</a> • <a href="#FlopImage">FlopImage</a> • <a href="#RollImage">RollImage</a> • <a href="#ShaveImage">ShaveImage</a> • <a href="#SpliceImage">SpliceImage</a> • <a href="#TransformImage">TransformImage</a> • <a href="#TransformImages">TransformImages</a> • <a href="#TransposeImage">TransposeImage</a> • <a href="#TransverseImage">TransverseImage</a> • <a href="#TrimImage">TrimImage</a>]</p>
154 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
155 _8c.html" target="source" name="ChopImage">ChopImage</a></h2>
156 <div class="doc-section">
158 <p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p></ol>
160 <p>The format of the ChopImage method is:</p>
163 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
164 ExceptionInfo *exception)
167 <p>A description of each parameter follows:</p></ol>
170 <ol><p>the image.</p></ol>
173 <ol><p>Define the region of the image to chop.</p></ol>
176 <ol><p>return any errors or warnings in this structure.</p></ol>
179 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
180 _8c.html" target="source" name="CropImage">CropImage</a></h2>
181 <div class="doc-section">
183 <p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p></ol>
185 <p>The format of the CropImage method is:</p>
188 Image *CropImage(const Image *image,const RectangleInfo *geometry,
189 ExceptionInfo *exception)
192 <p>A description of each parameter follows:</p></ol>
195 <ol><p>the image.</p></ol>
198 <ol><p>Define the region of the image to crop with members x, y, width, and height.</p></ol>
201 <ol><p>return any errors or warnings in this structure.</p></ol>
204 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
205 _8c.html" target="source" name="ExcerptImage">ExcerptImage</a></h2>
206 <div class="doc-section">
208 <p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p></ol>
210 <p>The format of the ExcerptImage method is:</p>
213 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
214 ExceptionInfo *exception)
217 <p>A description of each parameter follows:</p></ol>
220 <ol><p>the image.</p></ol>
223 <ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
226 <ol><p>return any errors or warnings in this structure.</p></ol>
229 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
230 _8c.html" target="source" name="ExtentImage">ExtentImage</a></h2>
231 <div class="doc-section">
233 <p>ExtentImage() extends the image as defined by the geometry, gravity, and image background color. Set the (x,y) offset of the geometry to move the original image relative to the extended image.</p></ol>
235 <p>The format of the ExtentImage method is:</p>
238 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
239 ExceptionInfo *exception)
242 <p>A description of each parameter follows:</p></ol>
245 <ol><p>the image.</p></ol>
248 <ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
251 <ol><p>return any errors or warnings in this structure.</p></ol>
254 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
255 _8c.html" target="source" name="FlipImage">FlipImage</a></h2>
256 <div class="doc-section">
258 <p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p></ol>
260 <p>The format of the FlipImage method is:</p>
263 Image *FlipImage(const Image *image,ExceptionInfo *exception)
266 <p>A description of each parameter follows:</p></ol>
269 <ol><p>the image.</p></ol>
272 <ol><p>return any errors or warnings in this structure.</p></ol>
275 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
276 _8c.html" target="source" name="FlopImage">FlopImage</a></h2>
277 <div class="doc-section">
279 <p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p></ol>
281 <p>The format of the FlopImage method is:</p>
284 Image *FlopImage(const Image *image,ExceptionInfo *exception)
287 <p>A description of each parameter follows:</p></ol>
290 <ol><p>the image.</p></ol>
293 <ol><p>return any errors or warnings in this structure.</p></ol>
296 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
297 _8c.html" target="source" name="RollImage">RollImage</a></h2>
298 <div class="doc-section">
300 <p>RollImage() offsets an image as defined by x_offset and y_offset.</p></ol>
302 <p>The format of the RollImage method is:</p>
305 Image *RollImage(const Image *image,const long x_offset,
306 const long y_offset,ExceptionInfo *exception)
309 <p>A description of each parameter follows:</p></ol>
312 <ol><p>the image.</p></ol>
315 <ol><p>the number of columns to roll in the horizontal direction.</p></ol>
318 <ol><p>the number of rows to roll in the vertical direction.</p></ol>
321 <ol><p>return any errors or warnings in this structure.</p></ol>
324 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
325 _8c.html" target="source" name="ShaveImage">ShaveImage</a></h2>
326 <div class="doc-section">
328 <p>ShaveImage() shaves pixels from the image edges. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.</p></ol>
330 <p>The format of the ShaveImage method is:</p>
333 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
334 ExceptionInfo *exception)
337 <p>A description of each parameter follows:</p></ol>
340 <ol><p>Method ShaveImage returns a pointer to the shaved image. A null image is returned if there is a memory shortage or if the image width or height is zero.</p></ol>
343 <ol><p>the image.</p></ol>
346 <ol><p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p></ol>
349 <ol><p>return any errors or warnings in this structure.</p></ol>
352 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
353 _8c.html" target="source" name="SpliceImage">SpliceImage</a></h2>
354 <div class="doc-section">
356 <p>SpliceImage() splices a solid color into the image as defined by the geometry.</p></ol>
358 <p>The format of the SpliceImage method is:</p>
361 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
362 ExceptionInfo *exception)
365 <p>A description of each parameter follows:</p></ol>
368 <ol><p>the image.</p></ol>
371 <ol><p>Define the region of the image to splice with members x, y, width, and height.</p></ol>
374 <ol><p>return any errors or warnings in this structure.</p></ol>
377 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
378 _8c.html" target="source" name="TransformImage">TransformImage</a></h2>
379 <div class="doc-section">
381 <p>TransformImage() is a convenience method that behaves like ResizeImage() or CropImage() but accepts scaling and/or cropping information as a region geometry specification. If the operation fails, the original image handle is returned.</p></ol>
383 <p>The format of the TransformImage method is:</p>
386 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
387 const char *image_geometry)
390 <p>A description of each parameter follows:</p></ol>
393 <ol><p>the image The transformed image is returned as this parameter.</p></ol>
395 <h5>crop_geometry</h5>
396 <ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
398 <h5>image_geometry</h5>
399 <ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
402 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
403 _8c.html" target="source" name="TransformImages">TransformImages</a></h2>
404 <div class="doc-section">
406 <p>TransformImages() calls TransformImage() on each image of a sequence.</p></ol>
408 <p>The format of the TransformImage method is:</p>
411 MagickBooleanType TransformImages(Image **image,
412 const char *crop_geometry,const char *image_geometry)
415 <p>A description of each parameter follows:</p></ol>
418 <ol><p>the image The transformed image is returned as this parameter.</p></ol>
420 <h5>crop_geometry</h5>
421 <ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
423 <h5>image_geometry</h5>
424 <ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
427 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
428 _8c.html" target="source" name="TransposeImage">TransposeImage</a></h2>
429 <div class="doc-section">
431 <p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p></ol>
433 <p>The format of the TransposeImage method is:</p>
436 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
439 <p>A description of each parameter follows:</p></ol>
442 <ol><p>the image.</p></ol>
445 <ol><p>return any errors or warnings in this structure.</p></ol>
448 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
449 _8c.html" target="source" name="TransverseImage">TransverseImage</a></h2>
450 <div class="doc-section">
452 <p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p></ol>
454 <p>The format of the TransverseImage method is:</p>
457 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
460 <p>A description of each parameter follows:</p></ol>
463 <ol><p>the image.</p></ol>
466 <ol><p>return any errors or warnings in this structure.</p></ol>
469 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
470 _8c.html" target="source" name="TrimImage">TrimImage</a></h2>
471 <div class="doc-section">
473 <p>TrimImage() trims pixels from the image edges. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.</p></ol>
475 <p>The format of the TrimImage method is:</p>
478 Image *TrimImage(const Image *image,ExceptionInfo *exception)
481 <p>A description of each parameter follows:</p></ol>
484 <ol><p>the image.</p></ol>
487 <ol><p>return any errors or warnings in this structure.</p></ol>
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