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11 <title>ImageMagick: MagickCore, C API for ImageMagick: Transform an Image</title>
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151 <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>
153 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
154 _8c.html" target="source" name="Chop">Chop</a></h2>
155 <div class="doc-section">
157 <p>Chop() removes a region of an image and collapses the image to occupy the removed portion.</p></ol>
159 <p>The format of the ChopImage method is:</p>
162 Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
163 ExceptionInfo *exception)
166 <p>A description of each parameter follows:</p></ol>
169 <ol><p>the image.</p></ol>
172 <ol><p>Define the region of the image to chop.</p></ol>
175 <ol><p>return any errors or warnings in this structure.</p></ol>
178 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
179 _8c.html" target="source" name="CropImage">CropImage</a></h2>
180 <div class="doc-section">
182 <p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p></ol>
184 <p>The format of the CropImage method is:</p>
187 Image *CropImage(const Image *image,const RectangleInfo *geometry,
188 ExceptionInfo *exception)
191 <p>A description of each parameter follows:</p></ol>
194 <ol><p>the image.</p></ol>
197 <ol><p>Define the region of the image to crop with members x, y, width, and height.</p></ol>
200 <ol><p>return any errors or warnings in this structure.</p></ol>
203 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
204 _8c.html" target="source" name="ExcerptImage">ExcerptImage</a></h2>
205 <div class="doc-section">
207 <p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p></ol>
209 <p>The format of the ExcerptImage method is:</p>
212 Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
213 ExceptionInfo *exception)
216 <p>A description of each parameter follows:</p></ol>
219 <ol><p>the image.</p></ol>
222 <ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
225 <ol><p>return any errors or warnings in this structure.</p></ol>
228 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
229 _8c.html" target="source" name="ExtentImage">ExtentImage</a></h2>
230 <div class="doc-section">
232 <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>
234 <p>The format of the ExtentImage method is:</p>
237 Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
238 ExceptionInfo *exception)
241 <p>A description of each parameter follows:</p></ol>
244 <ol><p>the image.</p></ol>
247 <ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
250 <ol><p>return any errors or warnings in this structure.</p></ol>
253 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
254 _8c.html" target="source" name="FlipImage">FlipImage</a></h2>
255 <div class="doc-section">
257 <p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p></ol>
259 <p>The format of the FlipImage method is:</p>
262 Image *FlipImage(const Image *image,ExceptionInfo *exception)
265 <p>A description of each parameter follows:</p></ol>
268 <ol><p>the image.</p></ol>
271 <ol><p>return any errors or warnings in this structure.</p></ol>
274 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
275 _8c.html" target="source" name="FlopImage">FlopImage</a></h2>
276 <div class="doc-section">
278 <p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p></ol>
280 <p>The format of the FlopImage method is:</p>
283 Image *FlopImage(const Image *image,ExceptionInfo *exception)
286 <p>A description of each parameter follows:</p></ol>
289 <ol><p>the image.</p></ol>
292 <ol><p>return any errors or warnings in this structure.</p></ol>
295 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
296 _8c.html" target="source" name="RollImage">RollImage</a></h2>
297 <div class="doc-section">
299 <p>RollImage() offsets an image as defined by x_offset and y_offset.</p></ol>
301 <p>The format of the RollImage method is:</p>
304 Image *RollImage(const Image *image,const long x_offset,
305 const long y_offset,ExceptionInfo *exception)
308 <p>A description of each parameter follows:</p></ol>
311 <ol><p>the image.</p></ol>
314 <ol><p>the number of columns to roll in the horizontal direction.</p></ol>
317 <ol><p>the number of rows to roll in the vertical direction.</p></ol>
320 <ol><p>return any errors or warnings in this structure.</p></ol>
323 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
324 _8c.html" target="source" name="ShaveImage">ShaveImage</a></h2>
325 <div class="doc-section">
327 <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>
329 <p>The format of the ShaveImage method is:</p>
332 Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
333 ExceptionInfo *exception)
336 <p>A description of each parameter follows:</p></ol>
339 <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>
342 <ol><p>the image.</p></ol>
345 <ol><p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p></ol>
348 <ol><p>return any errors or warnings in this structure.</p></ol>
351 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
352 _8c.html" target="source" name="SpliceImage">SpliceImage</a></h2>
353 <div class="doc-section">
355 <p>SpliceImage() splices a solid color into the image as defined by the geometry.</p></ol>
357 <p>The format of the SpliceImage method is:</p>
360 Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
361 ExceptionInfo *exception)
364 <p>A description of each parameter follows:</p></ol>
367 <ol><p>the image.</p></ol>
370 <ol><p>Define the region of the image to splice with members x, y, width, and height.</p></ol>
373 <ol><p>return any errors or warnings in this structure.</p></ol>
376 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
377 _8c.html" target="source" name="TransformImage">TransformImage</a></h2>
378 <div class="doc-section">
380 <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>
382 <p>The format of the TransformImage method is:</p>
385 MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
386 const char *image_geometry)
389 <p>A description of each parameter follows:</p></ol>
392 <ol><p>the image The transformed image is returned as this parameter.</p></ol>
394 <h5>crop_geometry</h5>
395 <ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
397 <h5>image_geometry</h5>
398 <ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
401 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
402 _8c.html" target="source" name="TransformImages">TransformImages</a></h2>
403 <div class="doc-section">
405 <p>TransformImages() calls TransformImage() on each image of a sequence.</p></ol>
407 <p>The format of the TransformImage method is:</p>
410 MagickBooleanType TransformImages(Image **image,
411 const char *crop_geometry,const char *image_geometry)
414 <p>A description of each parameter follows:</p></ol>
417 <ol><p>the image The transformed image is returned as this parameter.</p></ol>
419 <h5>crop_geometry</h5>
420 <ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
422 <h5>image_geometry</h5>
423 <ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
426 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
427 _8c.html" target="source" name="TransposeImage">TransposeImage</a></h2>
428 <div class="doc-section">
430 <p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p></ol>
432 <p>The format of the TransposeImage method is:</p>
435 Image *TransposeImage(const Image *image,ExceptionInfo *exception)
438 <p>A description of each parameter follows:</p></ol>
441 <ol><p>the image.</p></ol>
444 <ol><p>return any errors or warnings in this structure.</p></ol>
447 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
448 _8c.html" target="source" name="TransverseImage">TransverseImage</a></h2>
449 <div class="doc-section">
451 <p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p></ol>
453 <p>The format of the TransverseImage method is:</p>
456 Image *TransverseImage(const Image *image,ExceptionInfo *exception)
459 <p>A description of each parameter follows:</p></ol>
462 <ol><p>the image.</p></ol>
465 <ol><p>return any errors or warnings in this structure.</p></ol>
468 <h2><a href="http://www.imagemagick.org/api/MagickCore/transform
469 _8c.html" target="source" name="TrimImage">TrimImage</a></h2>
470 <div class="doc-section">
472 <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>
474 <p>The format of the TrimImage method is:</p>
477 Image *TrimImage(const Image *image,ExceptionInfo *exception)
480 <p>A description of each parameter follows:</p></ol>
483 <ol><p>the image.</p></ol>
486 <ol><p>return any errors or warnings in this structure.</p></ol>
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