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12 <title>ImageMagick: MagickCore, C API for ImageMagick: Transform an Image</title>
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155 <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>
157 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
158 _8c.html" target="source" name="ChopImage">ChopImage</a></h2>
159 <div class="doc-section">
161 <p>ChopImage() removes a region of an image and collapses the image to occupy the removed portion.</p></ol>
163 <p>The format of the ChopImage method is:</p>
166 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
167 ExceptionInfo *exception)
170 <p>A description of each parameter follows:</p></ol>
173 <ol><p>the image.</p></ol>
176 <ol><p>Define the region of the image to chop.</p></ol>
179 <ol><p>return any errors or warnings in this structure.</p></ol>
182 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
183 _8c.html" target="source" name="CropImage">CropImage</a></h2>
184 <div class="doc-section">
186 <p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p></ol>
188 <p>The format of the CropImage method is:</p>
191 Image *CropImage(const Image *image,const RectangleInfo *geometry,
192 ExceptionInfo *exception)
195 <p>A description of each parameter follows:</p></ol>
198 <ol><p>the image.</p></ol>
201 <ol><p>Define the region of the image to crop with members x, y, width, and height.</p></ol>
204 <ol><p>return any errors or warnings in this structure.</p></ol>
207 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
208 _8c.html" target="source" name="ExcerptImage">ExcerptImage</a></h2>
209 <div class="doc-section">
211 <p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p></ol>
213 <p>The format of the ExcerptImage method is:</p>
216 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
217 ExceptionInfo *exception)
220 <p>A description of each parameter follows:</p></ol>
223 <ol><p>the image.</p></ol>
226 <ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
229 <ol><p>return any errors or warnings in this structure.</p></ol>
232 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
233 _8c.html" target="source" name="ExtentImage">ExtentImage</a></h2>
234 <div class="doc-section">
236 <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>
238 <p>The format of the ExtentImage method is:</p>
241 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
242 ExceptionInfo *exception)
245 <p>A description of each parameter follows:</p></ol>
248 <ol><p>the image.</p></ol>
251 <ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
254 <ol><p>return any errors or warnings in this structure.</p></ol>
257 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
258 _8c.html" target="source" name="FlipImage">FlipImage</a></h2>
259 <div class="doc-section">
261 <p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p></ol>
263 <p>The format of the FlipImage method is:</p>
266 Image *FlipImage(const Image *image,ExceptionInfo *exception)
269 <p>A description of each parameter follows:</p></ol>
272 <ol><p>the image.</p></ol>
275 <ol><p>return any errors or warnings in this structure.</p></ol>
278 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
279 _8c.html" target="source" name="FlopImage">FlopImage</a></h2>
280 <div class="doc-section">
282 <p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p></ol>
284 <p>The format of the FlopImage method is:</p>
287 Image *FlopImage(const Image *image,ExceptionInfo *exception)
290 <p>A description of each parameter follows:</p></ol>
293 <ol><p>the image.</p></ol>
296 <ol><p>return any errors or warnings in this structure.</p></ol>
299 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
300 _8c.html" target="source" name="RollImage">RollImage</a></h2>
301 <div class="doc-section">
303 <p>RollImage() offsets an image as defined by x_offset and y_offset.</p></ol>
305 <p>The format of the RollImage method is:</p>
308 Image *RollImage(const Image *image,const ssize_t x_offset,
309 const ssize_t y_offset,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 to roll in the horizontal direction.</p></ol>
321 <ol><p>the number of rows to roll in the vertical direction.</p></ol>
324 <ol><p>return any errors or warnings in this structure.</p></ol>
327 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
328 _8c.html" target="source" name="ShaveImage">ShaveImage</a></h2>
329 <div class="doc-section">
331 <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>
333 <p>The format of the ShaveImage method is:</p>
336 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
337 ExceptionInfo *exception)
340 <p>A description of each parameter follows:</p></ol>
343 <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>
346 <ol><p>the image.</p></ol>
349 <ol><p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p></ol>
352 <ol><p>return any errors or warnings in this structure.</p></ol>
355 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
356 _8c.html" target="source" name="SpliceImage">SpliceImage</a></h2>
357 <div class="doc-section">
359 <p>SpliceImage() splices a solid color into the image as defined by the geometry.</p></ol>
361 <p>The format of the SpliceImage method is:</p>
364 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
365 ExceptionInfo *exception)
368 <p>A description of each parameter follows:</p></ol>
371 <ol><p>the image.</p></ol>
374 <ol><p>Define the region of the image to splice with members x, y, width, and height.</p></ol>
377 <ol><p>return any errors or warnings in this structure.</p></ol>
380 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
381 _8c.html" target="source" name="TransformImage">TransformImage</a></h2>
382 <div class="doc-section">
384 <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>
386 <p>The format of the TransformImage method is:</p>
389 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
390 const char *image_geometry)
393 <p>A description of each parameter follows:</p></ol>
396 <ol><p>the image The transformed image is returned as this parameter.</p></ol>
398 <h5>crop_geometry</h5>
399 <ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
401 <h5>image_geometry</h5>
402 <ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
405 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
406 _8c.html" target="source" name="TransformImages">TransformImages</a></h2>
407 <div class="doc-section">
409 <p>TransformImages() calls TransformImage() on each image of a sequence.</p></ol>
411 <p>The format of the TransformImage method is:</p>
414 MagickBooleanType TransformImages(Image **image,
415 const char *crop_geometry,const char *image_geometry)
418 <p>A description of each parameter follows:</p></ol>
421 <ol><p>the image The transformed image is returned as this parameter.</p></ol>
423 <h5>crop_geometry</h5>
424 <ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
426 <h5>image_geometry</h5>
427 <ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
430 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
431 _8c.html" target="source" name="TransposeImage">TransposeImage</a></h2>
432 <div class="doc-section">
434 <p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p></ol>
436 <p>The format of the TransposeImage method is:</p>
439 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
442 <p>A description of each parameter follows:</p></ol>
445 <ol><p>the image.</p></ol>
448 <ol><p>return any errors or warnings in this structure.</p></ol>
451 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
452 _8c.html" target="source" name="TransverseImage">TransverseImage</a></h2>
453 <div class="doc-section">
455 <p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p></ol>
457 <p>The format of the TransverseImage method is:</p>
460 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
463 <p>A description of each parameter follows:</p></ol>
466 <ol><p>the image.</p></ol>
469 <ol><p>return any errors or warnings in this structure.</p></ol>
472 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
473 _8c.html" target="source" name="TrimImage">TrimImage</a></h2>
474 <div class="doc-section">
476 <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>
478 <p>The format of the TrimImage method is:</p>
481 Image *TrimImage(const Image *image,ExceptionInfo *exception)
484 <p>A description of each parameter follows:</p></ol>
487 <ol><p>the image.</p></ol>
490 <ol><p>return any errors or warnings in this structure.</p></ol>
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