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<title>ImageMagick: MagickCore, C API for ImageMagick: Transform an Image</title>
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<div class="main">
<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>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="Chop">Chop</a></h2>
</div>
<p>Chop() removes a region of an image and collapses the image to occupy the removed portion.</p></ol>
<p>The format of the ChopImage method is:</p>
<pre class="code">
Image *ChopImage(const Image *image,const RectangleInfo *chop_info)
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>chop_info</h5>
<ol><p>Define the region of the image to chop.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="CropImage">CropImage</a></h2>
</div>
<p>CropImage() extracts a region of the image starting at the offset defined by geometry.</p></ol>
<p>The format of the CropImage method is:</p>
<pre class="code">
Image *CropImage(const Image *image,const RectangleInfo *geometry,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>geometry</h5>
<ol><p>Define the region of the image to crop with members x, y, width, and height.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="ExcerptImage">ExcerptImage</a></h2>
</div>
<p>ExcerptImage() returns a excerpt of the image as defined by the geometry.</p></ol>
<p>The format of the ExcerptImage method is:</p>
<pre class="code">
Image *ExcerptImage(const Image *image,const RectangleInfo *geometry,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>geometry</h5>
<ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="ExtentImage">ExtentImage</a></h2>
</div>
<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>
<p>The format of the ExtentImage method is:</p>
<pre class="code">
Image *ExtentImage(const Image *image,const RectangleInfo *geometry,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>geometry</h5>
<ol><p>Define the region of the image to extend with members x, y, width, and height.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="FlipImage">FlipImage</a></h2>
</div>
<p>FlipImage() creates a vertical mirror image by reflecting the pixels around the central x-axis.</p></ol>
<p>The format of the FlipImage method is:</p>
<pre class="code">
Image *FlipImage(const Image *image,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="FlopImage">FlopImage</a></h2>
</div>
<p>FlopImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis.</p></ol>
<p>The format of the FlopImage method is:</p>
<pre class="code">
Image *FlopImage(const Image *image,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="RollImage">RollImage</a></h2>
</div>
<p>RollImage() offsets an image as defined by x_offset and y_offset.</p></ol>
<p>The format of the RollImage method is:</p>
<pre class="code">
Image *RollImage(const Image *image,const long x_offset,
const long y_offset,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>x_offset</h5>
<ol><p>the number of columns to roll in the horizontal direction.</p></ol>
<h5>y_offset</h5>
<ol><p>the number of rows to roll in the vertical direction.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="ShaveImage">ShaveImage</a></h2>
</div>
<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>
<p>The format of the ShaveImage method is:</p>
<pre class="code">
Image *ShaveImage(const Image *image,const RectangleInfo *shave_info,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>shave_image</h5>
<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>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>shave_info</h5>
<ol><p>Specifies a pointer to a RectangleInfo which defines the region of the image to crop.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="SpliceImage">SpliceImage</a></h2>
</div>
<p>SpliceImage() splices a solid color into the image as defined by the geometry.</p></ol>
<p>The format of the SpliceImage method is:</p>
<pre class="code">
Image *SpliceImage(const Image *image,const RectangleInfo *geometry,
ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>geometry</h5>
<ol><p>Define the region of the image to splice with members x, y, width, and height.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="TransformImage">TransformImage</a></h2>
</div>
<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>
<p>The format of the TransformImage method is:</p>
<pre class="code">
MagickBooleanType TransformImage(Image **image,const char *crop_geometry,
const char *image_geometry)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image The transformed image is returned as this parameter.</p></ol>
<h5>crop_geometry</h5>
<ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
<h5>image_geometry</h5>
<ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="TransformImages">TransformImages</a></h2>
</div>
<p>TransformImages() calls TransformImage() on each image of a sequence.</p></ol>
<p>The format of the TransformImage method is:</p>
<pre class="code">
MagickBooleanType TransformImages(Image **image,
const char *crop_geometry,const char *image_geometry)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image The transformed image is returned as this parameter.</p></ol>
<h5>crop_geometry</h5>
<ol><p>A crop geometry string. This geometry defines a subregion of the image to crop.</p></ol>
<h5>image_geometry</h5>
<ol><p>An image geometry string. This geometry defines the final size of the image.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="TransposeImage">TransposeImage</a></h2>
</div>
<p>TransposeImage() creates a horizontal mirror image by reflecting the pixels around the central y-axis while rotating them by 90 degrees.</p></ol>
<p>The format of the TransposeImage method is:</p>
<pre class="code">
Image *TransposeImage(const Image *image,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="TransverseImage">TransverseImage</a></h2>
</div>
<p>TransverseImage() creates a vertical mirror image by reflecting the pixels around the central x-axis while rotating them by 270 degrees.</p></ol>
<p>The format of the TransverseImage method is:</p>
<pre class="code">
Image *TransverseImage(const Image *image,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
<div style="margin: auto;">
<h2><a href="http://www.imagemagick.org/api/MagickCore/transform
_8c.html" target="source" name="TrimImage">TrimImage</a></h2>
</div>
<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>
<p>The format of the TrimImage method is:</p>
<pre class="code">
Image *TrimImage(const Image *image,ExceptionInfo *exception)
</pre>
<p>A description of each parameter follows:</p></ol>
<h5>image</h5>
<ol><p>the image.</p></ol>
<h5>exception</h5>
<ol><p>return any errors or warnings in this structure.</p></ol>
</div>
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