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  <title>ImageMagick: MagickCore, Low-level C API for ImageMagick</title>
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<p>The MagickCore API is a low-level interface between the C programming language and the ImageMagick image processing libraries and is recommended for wizard-level programmers only.  Unlike the <a href="../www/magick-wand.html">MagickWand</a> C API which uses only a few opaque types and accessors, with MagickCore you almost exlusively access the structure members directly.  A description of the MagickCore public methods are found here:</p>

<ul>
  <li><a href="../www/api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
  <li><a href="../www/api/constitute.html">Constitute an Image</a></li>
  <li><a href="../www/api/composite.html">Composite an Image</a></li>
  <li><a href="../www/api/image.html">Image Methods</a></li>
  <li><a href="../www/api/color.html">Count the Colors in an Image</a></li>
  <li><a href="../www/api/colorspace.html">Dealing with Image Colorspaces</a></li>
  <li><a href="../www/api/layer.html">Dealing with Image Layers</a></li>
  <li><a href="../www/api/profile.html">Dealing with Image Profiles</a></li>
  <li><a href="../www/api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
  <li><a href="../www/api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
  <li><a href="../www/api/resize.html">Resize an Image</a></li>
  <li><a href="../www/api/transform.html">Transform an Image</a></li>
  <li><a href="../www/api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
  <li><a href="../www/api/enhance.html">Enhance an Image</a></li>
  <li><a href="../www/api/effect.html">Add an Effect</a></li>
  <li><a href="../www/api/fx.html">Add a Special Effect</a></li>
  <li><a href="../www/api/decorate.html">Decorate an Image</a></li>
  <li><a href="../www/api/attribute.html">Set Text Attributes</a></li>
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  <li><a href="../www/api/paint.html">Paint on an Image</a></li>
  <li><a href="../www/api/draw.html">Draw on an Image</a></li>
  <li><a href="../www/api/montage.html">Create an Image Thumbnail</a></li>
  <li><a href="../www/api/compare.html">Compare an Image to a Reconstructed Image</a></li>
  <li><a href="../www/api/display.html">Interactively Display and Edit an Image</a></li>
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  <li><a href="../www/api/signature.html">Compute a Message Digest for an Image</a></li>
  <li><a href="../www/api/registry.html">The Registry</a></li>
  <li><a href="../www/api/exception.html">Dealing with Exceptions</a></li>
  <li><a href="../www/api/memory.html">Memory Allocation</a></li>
  <li><a href="../www/api/resource.html">Monitor or Limit Resource Consumption</a></li>
  <li><a href="../www/api/monitor.html">Monitor the Progress of an Image Operation</a></li>
  <li><a href="../www/api/version.html">Get the Version and Copyrights</a></li>
</ul>

<p>After you write your MagickCore program, compile it like this:</p>

<pre class="text">
  cc `Magick-config --cflags --cppflags` core.c `Magick-config --ldflags --libs`
</pre>

<p>Here is a example program that utilizes the MagickCore API to get you started, <a href="../www/source/core.c">core.c</a>. It reads a GIF image, creates a thumbnail, and writes it to disk in the PNG image format.</p>

<div class='viewport'>
<pre class="code">
  #include &lt;stdio.h>
  #include &lt;stdlib.h>
  #include &lt;string.h>
  #include &lt;time.h>
  #include &lt;magick/MagickCore.h>
  
  int main(int argc,char **argv)
  {
    ExceptionInfo
      *exception;
  
    Image
      *image,
      *images,
      *resize_image,
      *thumbnails;
  
    ImageInfo
      *image_info;
  
    if (argc != 3)
      {
        (void) fprintf(stdout,"Usage: %s image thumnail\n",argv[0]);
        exit(0);
      }
    /*
      Initialize the image info structure and read an image.
    */
    InitializeMagick(*argv);
    exception=AcquireExceptionInfo();
    image_info=CloneImageInfo((ImageInfo *) NULL);
    (void) strcpy(image_info->filename,argv[1]);
    images=ReadImage(image_info,exception);
    if (exception->severity != UndefinedException)
      CatchException(exception);
    if (images == (Image *) NULL)
      exit(1);
    /*
      Convert the image to a thumbnail.
    */
    thumbnails=NewImageList();
    while ((image=RemoveFirstImageFromList(&images)) != (Image *) NULL)
    {
      resize_image=ResizeImage(image,106,80,LanczosFilter,1.0,exception);
      if (resize_image == (Image *) NULL)
        MagickError(exception->severity,exception->reason,exception->description);
      (void) AppendImageToList(&thumbnails,resize_image);
      DestroyImage(image);
    }
    /*
      Write the image thumbnail.
    */
    (void) strcpy(thumbnails->filename,argv[2]);
    WriteImage(image_info,thumbnails);
    /*
      Destroy the image thumbnail and exit.
    */
    thumbnails=DestroyImageList(thumbnails);
    image_info=DestroyImageInfo(image_info);
    exception=DestroyExceptionInfo(exception);
    DestroyMagick();
    return(0);
  }
</pre>
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