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  <title>ImageMagick: MagickCore, C API for ImageMagick: Resize an Image</title>
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<p class="navigation-index">[ <a href="#MagnifyImage">MagnifyImage</a> | <a href="#MinifyImage">MinifyImage</a> | <a href="#ResizeImage">ResizeImage</a> | <a href="#SampleImage">SampleImage</a> | <a href="#ScaleImage">ScaleImage</a> | <a href="#ThumbnailImage">ThumbnailImage</a> | <a href="#ZoomImage">ZoomImage</a> ]</p>

<div style="margin: auto;">
  <h2><a name="MagnifyImage">MagnifyImage</a></h2>
</div>

<p>MagnifyImage() is a convenience method that scales an image proportionally to twice its size.</p>

<p>The format of the MagnifyImage method is:</p>

<pre class="code">
  Image *MagnifyImage(const Image *image,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<h4>image</h4>
<p>The image.</p>

<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>

<div style="margin: auto;">
  <h2><a name="MinifyImage">MinifyImage</a></h2>
</div>

<p>MinifyImage() is a convenience method that scales an image proportionally to half its size.</p>

<p>The format of the MinifyImage method is:</p>

<pre class="code">
  Image *MinifyImage(const Image *image,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<h4>image</h4>
<p>The image.</p>

<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>

<div style="margin: auto;">
  <h2><a name="ResizeImage">ResizeImage</a></h2>
</div>

<p>ResizeImage() scales an image to the desired dimensions with one of these filters:</p>

<pre class="text">
      Bessel   Blackman   Box
      Catrom   CubicGaussian
      Hanning  Hermite    Lanczos
      Mitchell PointQuandratic
      Sinc     Triangle
</pre>

<p>Most of the filters are FIR (finite impulse response), however, Bessel, Gaussian, and Sinc are IIR (infinite impulse response).  Bessel and Sinc are windowed (brought down to zero) with the Blackman filter.</p>

<p>ResizeImage() was inspired by Paul Heckbert's zoom program.</p>

<p>The format of the ResizeImage method is:</p>

<pre class="code">
  Image *ResizeImage(Image *image,const unsigned long columns,
    const unsigned long rows,const FilterTypes filter,const double blur,
    ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<h4>image</h4>
<p>The image.</p>

<h4>columns</h4>
<p>The number of columns in the scaled image.</p>

<h4>rows</h4>
<p>The number of rows in the scaled image.</p>

<h4>filter</h4>
<p>Image filter to use.</p>

<h4>blur</h4>
<p>The blur factor where > 1 is blurry, < 1 is sharp.</p>

<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>

<div style="margin: auto;">
  <h2><a name="SampleImage">SampleImage</a></h2>
</div>

<p>SampleImage() scales an image to the desired dimensions with pixel sampling.  Unlike other scaling methods, this method does not introduce any additional color into the scaled image.</p>

<p>The format of the SampleImage method is:</p>

<pre class="code">
  Image *SampleImage(const Image *image,const unsigned long columns,
    const unsigned long rows,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<h4>image</h4>
<p>The image.</p>

<h4>columns</h4>
<p>The number of columns in the sampled image.</p>

<h4>rows</h4>
<p>The number of rows in the sampled image.</p>

<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>

<div style="margin: auto;">
  <h2><a name="ScaleImage">ScaleImage</a></h2>
</div>

<p>ScaleImage() changes the size of an image to the given dimensions.</p>

<p>The format of the ScaleImage method is:</p>

<pre class="code">
  Image *ScaleImage(const Image *image,const unsigned long columns,
    const unsigned long rows,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<h4>image</h4>
<p>The image.</p>

<h4>columns</h4>
<p>The number of columns in the scaled image.</p>

<h4>rows</h4>
<p>The number of rows in the scaled image.</p>

<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>

<div style="margin: auto;">
  <h2><a name="ThumbnailImage">ThumbnailImage</a></h2>
</div>

<p>ThumbnailImage() changes the size of an image to the given dimensions and removes any associated profiles.  The goal is to produce small low cost thumbnail images suited for display on the Web.</p>

<p>The format of the ThumbnailImage method is:</p>

<pre class="code">
  Image *ThumbnailImage(const Image *image,const unsigned long columns,
    const unsigned long rows,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<h4>image</h4>
<p>The image.</p>

<h4>columns</h4>
<p>The number of columns in the scaled image.</p>

<h4>rows</h4>
<p>The number of rows in the scaled image.</p>

<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>

<div style="margin: auto;">
  <h2><a name="ZoomImage">ZoomImage</a></h2>
</div>

<p>ZoomImage() creates a new image that is a scaled size of an existing one. It allocates the memory necessary for the new Image structure and returns a pointer to the new image.  The Point filter gives fast pixel replication, Triangle is equivalent to bi-linear interpolation, and Mitchel giver slower, very high-quality results.  See Graphic Gems III for details on this algorithm.</p>

<p>The filter member of the Image structure specifies which image filter to use. Blur specifies the blur factor where > 1 is blurry, < 1 is sharp.</p>

<p>The format of the ZoomImage method is:</p>

<pre class="code">
  Image *ZoomImage(const Image *image,const unsigned long columns,
    const unsigned long rows,ExceptionInfo *exception)
</pre>

<p>A description of each parameter follows:</p>

<h4>zoom_image</h4>
<p>Method ZoomImage returns a pointer to the image after scaling.  A null image is returned if there is a memory shortage.</p>

<h4>image</h4>
<p>The image.</p>

<h4>columns</h4>
<p>An integer that specifies the number of columns in the zoom image.</p>

<h4>rows</h4>
<p>An integer that specifies the number of rows in the scaled image.</p>

<h4>exception</h4>
<p>Return any errors or warnings in this structure.</p>

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