magick-core.html - Android社区 - https://www.androidos.net.cn/




<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8"  />
  <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1,shrink-to-fit=no"  />
  <title>MagickCore, Low-level C API @ ImageMagick</title>
  <meta name="application-name" content="ImageMagick" />
  <meta name="description" content="Use ImageMagick® to create, edit, compose, or convert bitmap images. You can resize your image, crop it, change its shades and colors, add captions, among other operations." />
  <meta name="application-url" content="https://imagemagick.org" />
  <meta name="generator" content="PHP" />
  <meta name="keywords" content="magickcore, low-level, c, api, ImageMagick, PerlMagick, image processing, image, photo, software, Magick++, OpenMP, convert" />
  <meta name="rating" content="GENERAL" />
  <meta name="robots" content="INDEX, FOLLOW" />
  <meta name="generator" content="ImageMagick Studio LLC" />
  <meta name="author" content="ImageMagick Studio LLC" />
  <meta name="revisit-after" content="2 DAYS" />
  <meta name="resource-type" content="document" />
  <meta name="copyright" content="Copyright (c) 1999-2019 ImageMagick Studio LLC" />
  <meta name="distribution" content="Global" />
  <meta name="magick-serial" content="P131-S030410-R485315270133-P82224-A6668-G1245-1" />
  <meta name="google-site-verification" content="_bMOCDpkx9ZAzBwb2kF3PRHbfUUdFj2uO8Jd1AXArz4" />
  <link href="magick-core.html" rel="canonical" />
  <link href="../images/wand.png" rel="icon" />
  <link href="../images/wand.ico" rel="shortcut icon" />
  <link href="assets/magick.css" rel="stylesheet" />
</head>
<body>
  <header>
  <nav class="navbar navbar-expand-md navbar-dark fixed-top bg-dark">
    <a class="navbar-brand" href="../"><img class="d-block" id="icon" alt="ImageMagick" width="32" height="32" src="../images/wand.ico"/></a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsMagick" aria-controls="navbarsMagick" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>

    <div class="navbar-collapse collapse" id="navbarsMagick" style="">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item ">
        <a class="nav-link" href="api/quantize.html">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item ">
        <a class="nav-link" href="../www/download.html">Download</a>
      </li>
      <li class="nav-item ">
        <a class="nav-link" href="../www/command-line-tools.html">Tools</a>
      </li>
      <li class="nav-item ">
        <a class="nav-link" href="../www/command-line-processing.html">Command-line</a>
      </li>
      <li class="nav-item ">
        <a class="nav-link" href="../www/resources.html">Resources</a>
      </li>
      <li class="nav-item ">
        <a class="nav-link" href="../www/develop.html">Develop</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" target="_blank" href="https://imagemagick.org/discourse-server/">Community</a>
      </li>
    </ul>
    <form class="form-inline my-2 my-lg-0" action="https://imagemagick.org/script/search.php">
      <input class="form-control mr-sm-2" type="text" name="q" placeholder="Search" aria-label="Search">
      <button class="btn btn-outline-success my-2 my-sm-0" type="submit" name="sa">Search</button>
    </form>
    </div>
  </nav>
  <div class="container">
   <script async="async" src="https://localhost/pagead/js/adsbygoogle.js"></script>    <ins class="adsbygoogle"
         style="display:block"
         data-ad-client="ca-pub-3129977114552745"
         data-ad-slot="6345125851"
         data-ad-format="auto"></ins>
    <script>
      (adsbygoogle = window.adsbygoogle || []).push({});
    </script>

  </div>
  </header>
  <main class="container">
    <div class="magick-template">
<div class="magick-header">

<p  class="lead magick-description">The <a href="api/MagickCore/index.html">MagickCore API</a> 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="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="api/magick.html">Initialize or Destroy the ImageMagick Environment</a></li>
  <li><a href="api/constitute.html">Constitute an Image</a></li>
  <li><a href="api/composite.html">Composite an Image</a></li>
  <li><a href="api/image.html">Image Methods</a></li>
  <li><a href="api/channel.html">Image Channel Methods</a></li>
  <li><a href="api/color.html">Count the Colors in an Image</a></li>
  <li><a href="api/colormap.html">Colormap Methods</a></li>
  <li><a href="api/colorspace.html">Colorspace Methods</a></li>
  <li><a href="api/distort.html">Image Distortions</a></li>
  <li><a href="api/layer.html">Dealing with Image Layers</a></li>
  <li><a href="api/profile.html">Dealing with Image Profiles</a></li>
  <li><a href="api/quantize.html">Reduce the Number of Unique Colors in an Image</a></li>
  <li><a href="api/histogram.html">Image Histograms</a></li>
  <li><a href="api/segment.html">Segment an Image with Thresholding Fuzzy c-Means</a></li>
  <li><a href="api/resize.html">Resize an Image</a></li>
  <li><a href="api/transform.html">Transform an Image</a></li>
  <li><a href="api/shear.html">Shear or Rotate an Image by an Arbitrary Angle</a></li>
  <li><a href="api/enhance.html">Enhance an Image</a></li>
  <li><a href="api/effect.html">Add an Effect</a></li>
  <li><a href="api/morphology.html">Morphological Erosions, Dilations, Openings, and Closings</a></li>
  <li><a href="api/fx.html">Add a Special Effect</a></li>
  <li><a href="api/decorate.html">Decorate an Image</a></li>
  <li><a href="api/attribute.html">Get/Set an Image Attribute</a></li>
  <li><a href="api/property.html">Get/Set Image Properties</a></li>
  <li><a href="api/statistic.html">Get Image Statistics</a></li>
  <li><a href="api/feature.html">Get Image Features</a></li>
  <li><a href="api/annotate.html">Annotate an Image</a></li>
  <li><a href="api/paint.html">Paint on an Image</a></li>
  <li><a href="api/draw.html">Draw on an Image</a></li>
  <li><a href="api/montage.html">Create an Image Thumbnail</a></li>
  <li><a href="api/fourier.html">Compute the discrete Fourier transform (DFT)</a></li>
  <li><a href="api/compare.html">Compare an Image to a Reconstructed Image</a></li>
  <li><a href="api/display.html">Interactively Display and Edit an Image</a></li>
  <li><a href="api/animate.html">Interactively Animate an Image Sequence</a></li>
  <li><a href="api/cipher.html">Convert to and from Cipher Pixels</a></li>
  <li><a href="api/list.html">Working with Image Lists</a></li>
  <li><a href="api/image-view.html">Image View Methods</a></li>
  <li><a href="api/cache.html">Get or Set Image Pixels</a></li>
  <li><a href="api/cache-view.html">Working with Cache Views</a></li>
  <li><a href="api/stream.html">The Pixel FIFO</a></li>
  <li><a href="api/blob.html">Read or Write Binary Large OBjects</a></li>
  <li><a href="api/module.html">Loadable Modules</a></li>
  <li><a href="api/signature.html">Compute a Message Digest for an Image</a></li>
  <li><a href="api/registry.html">The Image Registry</a></li>
  <li><a href="api/exception.html">Dealing with Exceptions</a></li>
  <li><a href="api/memory.html">Memory Allocation</a></li>
  <li><a href="api/resource.html">Monitor or Limit Resource Consumption</a></li>
  <li><a href="api/monitor.html">Monitor the Progress of an Image Operation</a></li>
  <li><a href="api/version.html">Get the Version and Copyrights</a></li>
  <li><a href="api/mime.html">Mime Methods</a></li>
  <li><a href="api/deprecate.html">Deprecated Methods</a></li>
  <li><a href="exception.html">Error and Warning Codes</a></li>
</ul>

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

<pre class="highlight"><code>cc -o core core.c `pkg-config --cflags --libs MagickWand`
</code></pre>

<p>Set the <code>PKG_CONFIG_PATH</code> environment variable if ImageMagick is not in your default system path:</p>

<pre class="highlight"><code>export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
</code></pre>

<p>Here is a example program that utilizes the MagickCore API to get you started, <a href="https://imagemagick.org/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>

<pre class="pre-scrollable"><code>#include &lt;stdio.h>
#include &lt;stdlib.h>
#include &lt;string.h>
#include &lt;time.h>
#include &lt;MagickCore/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 thumbnail\n",argv[0]);
      exit(0);
    }
  /*
    Initialize the image info structure and read an image.
  */
  MagickCoreGenesis(*argv,MagickTrue);
  exception=AcquireExceptionInfo();
  image_info=CloneImageInfo((ImageInfo *) NULL);
  (void) strcpy(image_info-&gt;filename,argv[1]);
  images=ReadImage(image_info,exception);
  if (exception-&gt;severity != UndefinedException)
    CatchException(exception);
  if (images == (Image *) NULL)
    exit(1);
  /*
    Convert the image to a thumbnail.
  */
  thumbnails=NewImageList();
  while ((image=RemoveFirstImageFromList(&amp;images)) != (Image *) NULL)
  {
    resize_image=ResizeImage(image,106,80,LanczosFilter,exception);
    if (resize_image == (Image *) NULL)
      MagickError(exception-&gt;severity,exception-&gt;reason,exception-&gt;description);
    (void) AppendImageToList(&amp;thumbnails,resize_image);
    DestroyImage(image);
  }
  /*
    Write the image thumbnail.
  */
  (void) strcpy(thumbnails-&gt;filename,argv[2]);
  WriteImage(image_info,thumbnails,exception);
  /*
    Destroy the image thumbnail and exit.
  */
  thumbnails=DestroyImageList(thumbnails);
  image_info=DestroyImageInfo(image_info);
  exception=DestroyExceptionInfo(exception);
  MagickCoreTerminus();
  return(0);
}</code></pre>
<p><a class="anchor" id="image-view"></a>Now lets perform the same contrast enhancement while taking advantage of our dual or quad-core processing system by running the algorithm in parallel utilizing wand views.  The <a href="https://imagemagick.org/source/core/sigmoidal-contrast.c">sigmoidal-contrast.c</a> module reads an image, applies sigmoidal non-linearity contrast control, and writes the result to disk just like the previous contrast enhancement program, but now it does its work in parallel (assumes ImageMagick is built with OpenMP support).</p>

<pre class="pre-scrollable"><code>#include &lt;stdio.h>
#include &lt;stdlib.h>
#include &lt;math.h>
#include &lt;MagickCore/MagickCore.h>

static MagickBooleanType SigmoidalContrast(ImageView *contrast_view,
  const ssize_t y,const int id,void *context)
{
#define QuantumScale  ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
#define SigmoidalContrast(x) \
  (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)

  RectangleInfo
    extent;

  register IndexPacket
    *indexes;

  register PixelPacket
    *pixels;

  register ssize_t
    x;

  extent=GetImageViewExtent(contrast_view);
  pixels=GetImageViewAuthenticPixels(contrast_view);
  for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
  {
    SetPixelRed(pixels,RoundToQuantum(SigmoidalContrast(GetPixelRed(pixels)));
    SetPixelGreen(pixels,RoundToQuantum(SigmoidalContrast(GetPixelGreen(pixels)));
    SetPixelBlue(pixels,RoundToQuantum(SigmoidalContrast(GetPixelBlue(pixels)));
    SetPixelOpacity(pixels,RoundToQuantum(SigmoidalContrast(GetPixelOpacity(pixels)));
    pixels++;
  }
  indexes=GetImageViewAuthenticIndexes(contrast_view);
  if (indexes != (IndexPacket *) NULL)
    for (x=0; x &lt; (ssize_t) (extent.width-extent.x); x++)
      SetPixelIndex(indexes+x,RoundToQuantum(SigmoidalContrast(GetPixelIndex(indexes+x))));
  return(MagickTrue);
}

int main(int argc,char **argv)
{
#define ThrowImageException(image) \
{ \
 \
  CatchException(exception); \
  if (contrast_image != (Image *) NULL) \
    contrast_image=DestroyImage(contrast_image); \
  exit(-1); \
}
#define ThrowViewException(view) \
{ \
  char \
    *description; \
 \
  ExceptionType \
    severity; \
 \
  description=GetImageViewException(view,&amp;severity); \
  (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
  description=DestroyString(description); \
  exit(-1); \
}

  ExceptionInfo
    *exception;

  Image
    *contrast_image;

  ImageInfo
    *image_info;

  ImageView
    *contrast_view;

  MagickBooleanType
    status;

  if (argc != 3)
    {
      (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
      exit(0);
    }
  /*
    Read an image.
  */
  MagickCoreGenesis(*argv,MagickTrue);
  image_info=AcquireImageInfo();
  (void) CopyMagickString(image_info->filename,argv[1],MaxTextExtent);
  exception=AcquireExceptionInfo();
  contrast_image=ReadImage(image_info,exception);
  if (contrast_image == (Image *) NULL)
    ThrowImageException(contrast_image);
  /*
    Sigmoidal non-linearity contrast control.
  */
  contrast_view=NewImageView(contrast_image);
  if (contrast_view == (ImageView *) NULL)
    ThrowImageException(contrast_image);
  status=UpdateImageViewIterator(contrast_view,SigmoidalContrast,(void *) NULL);
  if (status == MagickFalse)
    ThrowImageException(contrast_image);
  contrast_view=DestroyImageView(contrast_view);
  /*
    Write the image then destroy it.
  */
  status=WriteImages(image_info,contrast_image,argv[2],exception);
  if (status == MagickFalse)
    ThrowImageException(contrast_image);
  contrast_image=DestroyImage(contrast_image);
  exception=DestroyExceptionInfo(exception);
  image_info=DestroyImageInfo(image_info);
  MagickCoreTerminus();
  return(0);
}</code></pre>
</div>
    </div>
  </main><!-- /.container -->
  <footer class="magick-footer">
    <p><a href="../www/security-policy.html">Security</a> •
    <a href="../www/architecture.html">Architecture</a> •
    <a href="../www/links.html">Related</a> •
     <a href="../www/sitemap.html">Sitemap</a>
       
    <a href="magick-core.html#"><img class="d-inline" id="wand" alt="And Now a Touch of Magick" width="16" height="16" src="../images/wand.ico"/></a>
       
    <a href="http://pgp.mit.edu/pks/lookup?op=get&amp;search=0x89AB63D48277377A">Public Key</a> •
    <a href="../www/support.html">Donate</a> •
    <a href="../www/https://imagemagick.org/script/contact.php">Contact Us</a>
    <br/>
    <small>© 1999-2019 ImageMagick Studio LLC</small></p>
  </footer>

  <!-- Javascript assets -->
  <script src="assets/magick.js" crossorigin="anonymous"></script>
  <script>window.jQuery || document.write('<script src="https://localhost/ajax/libs/jquery/3.3.1/jquery.min.js"><\/script>')</script>
</body>
</html>