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11 <title>ImageMagick: MagickCore, C API for ImageMagick: Transform an Image</title>
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154 <p class="navigation-index">[<a href="#Chop">Chop</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>
156 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
157 _8c.html" target="source" name="Chop">Chop</a></h2>
158 <div class="doc-section">
160 <p>Chop() removes a region of an image and collapses the image to occupy the removed portion.</p></ol>
162 <p>The format of the ChopImage method is:</p>
165 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
166 ExceptionInfo *exception)
169 <p>A description of each parameter follows:</p></ol>
172 <ol><p>the image.</p></ol>
175 <ol><p>Define the region of the image to chop.</p></ol>
178 <ol><p>return any errors or warnings in this structure.</p></ol>
181 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
182 _8c.html" target="source" name="CropImage">CropImage</a></h2>
183 <div class="doc-section">
185 <p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p></ol>
187 <p>The format of the CropImage method is:</p>
190 Image *CropImage(const Image *image,const RectangleInfo *geometry,
191 ExceptionInfo *exception)
194 <p>A description of each parameter follows:</p></ol>
197 <ol><p>the image.</p></ol>
200 <ol><p>Define the region of the image to crop with members x, y, width, and height.</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/transform
207 _8c.html" target="source" name="ExcerptImage">ExcerptImage</a></h2>
208 <div class="doc-section">
210 <p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p></ol>
212 <p>The format of the ExcerptImage method is:</p>
215 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
216 ExceptionInfo *exception)
219 <p>A description of each parameter follows:</p></ol>
222 <ol><p>the image.</p></ol>
225 <ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
228 <ol><p>return any errors or warnings in this structure.</p></ol>
231 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
232 _8c.html" target="source" name="ExtentImage">ExtentImage</a></h2>
233 <div class="doc-section">
235 <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>
237 <p>The format of the ExtentImage method is:</p>
240 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
241 ExceptionInfo *exception)
244 <p>A description of each parameter follows:</p></ol>
247 <ol><p>the image.</p></ol>
250 <ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
253 <ol><p>return any errors or warnings in this structure.</p></ol>
256 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
257 _8c.html" target="source" name="FlipImage">FlipImage</a></h2>
258 <div class="doc-section">
260 <p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p></ol>
262 <p>The format of the FlipImage method is:</p>
265 Image *FlipImage(const Image *image,ExceptionInfo *exception)
268 <p>A description of each parameter follows:</p></ol>
271 <ol><p>the image.</p></ol>
274 <ol><p>return any errors or warnings in this structure.</p></ol>
277 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
278 _8c.html" target="source" name="FlopImage">FlopImage</a></h2>
279 <div class="doc-section">
281 <p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p></ol>
283 <p>The format of the FlopImage method is:</p>
286 Image *FlopImage(const Image *image,ExceptionInfo *exception)
289 <p>A description of each parameter follows:</p></ol>
292 <ol><p>the image.</p></ol>
295 <ol><p>return any errors or warnings in this structure.</p></ol>
298 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
299 _8c.html" target="source" name="RollImage">RollImage</a></h2>
300 <div class="doc-section">
302 <p>RollImage() offsets an image as defined by x_offset and y_offset.</p></ol>
304 <p>The format of the RollImage method is:</p>
307 Image *RollImage(const Image *image,const long x_offset,
308 const long y_offset,ExceptionInfo *exception)
311 <p>A description of each parameter follows:</p></ol>
314 <ol><p>the image.</p></ol>
317 <ol><p>the number of columns to roll in the horizontal direction.</p></ol>
320 <ol><p>the number of rows to roll in the vertical direction.</p></ol>
323 <ol><p>return any errors or warnings in this structure.</p></ol>
326 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
327 _8c.html" target="source" name="ShaveImage">ShaveImage</a></h2>
328 <div class="doc-section">
330 <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>
332 <p>The format of the ShaveImage method is:</p>
335 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
336 ExceptionInfo *exception)
339 <p>A description of each parameter follows:</p></ol>
342 <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>
345 <ol><p>the image.</p></ol>
348 <ol><p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p></ol>
351 <ol><p>return any errors or warnings in this structure.</p></ol>
354 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
355 _8c.html" target="source" name="SpliceImage">SpliceImage</a></h2>
356 <div class="doc-section">
358 <p>SpliceImage() splices a solid color into the image as defined by the geometry.</p></ol>
360 <p>The format of the SpliceImage method is:</p>
363 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
364 ExceptionInfo *exception)
367 <p>A description of each parameter follows:</p></ol>
370 <ol><p>the image.</p></ol>
373 <ol><p>Define the region of the image to splice with members x, y, width, and height.</p></ol>
376 <ol><p>return any errors or warnings in this structure.</p></ol>
379 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
380 _8c.html" target="source" name="TransformImage">TransformImage</a></h2>
381 <div class="doc-section">
383 <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>
385 <p>The format of the TransformImage method is:</p>
388 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
389 const char *image_geometry)
392 <p>A description of each parameter follows:</p></ol>
395 <ol><p>the image The transformed image is returned as this parameter.</p></ol>
397 <h5>crop_geometry</h5>
398 <ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
400 <h5>image_geometry</h5>
401 <ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
404 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
405 _8c.html" target="source" name="TransformImages">TransformImages</a></h2>
406 <div class="doc-section">
408 <p>TransformImages() calls TransformImage() on each image of a sequence.</p></ol>
410 <p>The format of the TransformImage method is:</p>
413 MagickBooleanType TransformImages(Image **image,
414 const char *crop_geometry,const char *image_geometry)
417 <p>A description of each parameter follows:</p></ol>
420 <ol><p>the image The transformed image is returned as this parameter.</p></ol>
422 <h5>crop_geometry</h5>
423 <ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
425 <h5>image_geometry</h5>
426 <ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
429 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
430 _8c.html" target="source" name="TransposeImage">TransposeImage</a></h2>
431 <div class="doc-section">
433 <p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p></ol>
435 <p>The format of the TransposeImage method is:</p>
438 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
441 <p>A description of each parameter follows:</p></ol>
444 <ol><p>the image.</p></ol>
447 <ol><p>return any errors or warnings in this structure.</p></ol>
450 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
451 _8c.html" target="source" name="TransverseImage">TransverseImage</a></h2>
452 <div class="doc-section">
454 <p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p></ol>
456 <p>The format of the TransverseImage method is:</p>
459 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
462 <p>A description of each parameter follows:</p></ol>
465 <ol><p>the image.</p></ol>
468 <ol><p>return any errors or warnings in this structure.</p></ol>
471 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
472 _8c.html" target="source" name="TrimImage">TrimImage</a></h2>
473 <div class="doc-section">
475 <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>
477 <p>The format of the TrimImage method is:</p>
480 Image *TrimImage(const Image *image,ExceptionInfo *exception)
483 <p>A description of each parameter follows:</p></ol>
486 <ol><p>the image.</p></ol>
489 <ol><p>return any errors or warnings in this structure.</p></ol>
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