1 2 3 4 5<!doctype html> 6<html lang="en"> 7<head> 8 <meta charset="utf-8" /> 9 <meta name="viewport" content="width=device-width, initial-scale=1" /> 10 <title>ImageMagick - Parallel Execution with OpenCL</title> 11 <meta name="application-name" content="ImageMagick" /> 12 <meta name="description" content="Use ImageMagick® to create, edit, compose, and convert digital images. Resize an image, crop it, change its shades and colors, add captions, and more." /> 13 <meta name="application-url" content="https://imagemagick.org" /> 14 <meta name="generator" content="PHP" /> 15 <meta name="keywords" content="parallel, execution, with, opencl, image processing software" /> 16 <meta name="rating" content="GENERAL" /> 17 <meta name="robots" content="INDEX, FOLLOW" /> 18 <meta name="generator" content="ImageMagick Studio LLC" /> 19 <meta name="author" content="ImageMagick Studio LLC" /> 20 <meta name="revisit-after" content="2 DAYS" /> 21 <meta name="resource-type" content="document" /> 22 <meta name="copyright" content="Copyright (c) 1999-2020 ImageMagick Studio LLC" /> 23 <meta name="distribution" content="Global" /> 24 <meta name="magick-serial" content="P131-S030410-R485315270133-P82224-A6668-G1245-1" /> 25 <meta property='og:url' content='../' /> 26 <meta property='og:title' content='ImageMagick' /> 27 <meta property='og:image' content='../images/logo.png' /> 28 <meta property='og:type' content='website' /> 29 <meta property='og:site_name' content='ImageMagick' /> 30 <meta property='og:description' content="Create, Edit, Compose, or Convert Digital Images" /> 31 <meta name="google-site-verification" content="_bMOCDpkx9ZAzBwb2kF3PRHbfUUdFj2uO8Jd1AXArz4" /> 32 <link href="opencl.html" rel="canonical" /> 33 <link href="../images/wand.png" rel="icon" /> 34 <link href="../images/wand.ico" rel="shortcut icon" /> 35 <link href="assets/magick.css" rel="stylesheet" /> 36</head> 37<body> 38 <nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top"> 39 <div class="container-fluid"> 40 <a class="navbar-brand" href="../"><img class="d-block" id="icon" alt="ImageMagick" width="32" height="32" src="../images/wand.ico"/></a> 41 <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#magick-navbars" aria-controls="magick-navbars" aria-expanded="false" aria-label="Toggle navigation"> 42 <span class="navbar-toggler-icon"></span> 43 </button> 44 45 <div class="collapse navbar-collapse" id="magick-navbars"> 46 <ul class="navbar-nav me-auto mb-2 mb-md-0"> 47 <li class="nav-item"> 48 <a class="nav-link " href="../www/index.html">Home</a> 49 </li> 50 <li class="nav-item"> 51 <a class="nav-link " href="../www/download.html">Download</a> 52 </li> 53 <li class="nav-item"> 54 <a class="nav-link " href="../www/command-line-tools.html">Tools</a> 55 </li> 56 <li class="nav-item"> 57 <a class="nav-link " href="../www/command-line-processing.html">CLI</a> 58 </li> 59 <li class="nav-item"> 60 <a class="nav-link " href="../www/develop.html">Develop</a> 61 </li> 62 <li class="nav-item"> 63 <a class="nav-link" target="_blank" href="https://github.com/ImageMagick/ImageMagick/discussions">Community</a> 64 </li> 65 <li class="nav-item"> 66 <iframe src="https://github.com/sponsors/ImageMagick/button" title="Sponsor ImageMagick" height="35" width="107" style="border: 0;"></iframe> 67 </li> 68 </ul> 69 <form class="d-flex form-inline" action="search.html"> 70 <input class="form-control me-2" type="text" name="q" placeholder="Search" aria-label="Search"> 71 <button class="btn btn-outline-success" type="submit" name="sa">Search</button> 72 </form> 73 </div> 74 </div> 75 </nav> 76 77 <div class="container"> 78 <script async="async" src="https://localhost/pagead/js/adsbygoogle.js"></script> 79 <ins class="adsbygoogle" 80 style="display:block" 81 data-ad-client="ca-pub-3129977114552745" 82 data-ad-slot="6345125851" 83 data-full-width-responsive="true" 84 data-ad-format="horizontal"></ins> 85 <script> 86 (adsbygoogle = window.adsbygoogle || []).push({}); 87 </script> 88 89 </div> 90 91 <main class="container"> 92 <div class="magick-template"> 93<div class="magick-header"> 94 95<p class="lead magick-description">The following is a list of image operators that have been <a href="http://en.wikipedia.org/wiki/OpenCL">OpenCL</a>-accelerated:</p> 96<pre class="highlight"><code>blur 97charcoal 98contrast 99constrast-stretch 100convolve 101despeckle 102edge 103equalize 104emboss 105function 106gaussian-blur 107grayscale 108modulate 109motion-blur 110negate 111noise 112radial-blur 113resize 114sketch 115unsharp</code></pre> 116<p>When the OpenCL acceleration is invoked for the first time, ImageMagick conducts a series of tests to configure the OpenCL environment according to the system hardware; therefore, it is normal to experience a higher latency the first time you use an accelerated option. The OpenCL kernels are embedded inside ImageMagick in source format. During the initial setup, ImageMagick discovers all the available OpenCL devices and compiles the kernels for each of these targets. ImageMagick also runs several performance tests internally to determine the preferred device to use. The compiled kernel code and the performance test results are stored into the cache directory so that the data can be reused by subsequent invocations of the OpenCL path. By default, the OpenCL cached data is stored in <code>$HOME/.cache/ImageMagick</code> on Linux and on MacOSX or in <code>%LOCALAPPDATA%\ImageMagick</code> on Windows. To change the cache directory, set the MAGICK_OPENCL_CACHE_DIR environment variable. ImageMagick is able to detect hardware changes, driver updates, and new kernel sources and re-run the setup and the calibration test. You can also force ImageMagick to re-run the process by removing the content from the cache directory.</p> 117<p>If ImageMagick includes OpenCL support, the OpenCL path is enable by default. You can disable it, simply set the environment variable MAGICK_OCL_DEVICE to <code>OFF</code>. You could also force the OpenCL path to use a particular class of devices by setting it to <code>GPU</code> or <code>CPU</code>.</p> 118<p>In addition to the environment variables just mentioned, ImageMagick provides a set of APIs that allow developers to gain a finer grain control of the OpenCL acceleration. For example, use the InitializeOpenCL) function to initialize the OpenCL environment:</p> 119<pre class="highlight"><code>clEnv=GetCurrentOpenCLEnv(); 120if (InitializeOpenCL(clEnv,exception) == MagickFalse) 121 { 122 /* looks like OpenCL is not supported */ 123 }</code></pre> 124</div> 125 </div> 126 </main><!-- /.container --> 127 <footer class="magick-footer"> 128 <div class="container-fluid"> 129 <a href="../www/security-policy.html">Security</a> • 130 <a href="../www/news.html">News</a> 131 132 <a href="opencl.html#"><img class="d-inline" id="wand" alt="And Now a Touch of Magick" width="16" height="16" src="../images/wand.ico"/></a> 133 134 <a href="../www/links.html">Related</a> • 135 <a href="../www/sitemap.html">Sitemap</a> 136 <br/> 137 <a href="../www/support.html">Sponsor</a> • 138 <a href="../www/cite.html">Cite</a> • 139 <a href="http://pgp.mit.edu/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> • 140 <a href="../www/https://imagemagick.org/script/contact.php">Contact Us</a> 141 <br/> 142 <a href="https://github.com/imagemagick/imagemagick" target="_blank" rel="noopener" aria-label="GitHub"><svg xmlns="http://www.w3.org/2000/svg" class="navbar-nav-svg" viewBox="0 0 512 499.36" width="2%" height="2%" role="img" focusable="false"><title>GitHub</title><path fill="currentColor" fill-rule="evenodd" d="M256 0C114.64 0 0 114.61 0 256c0 113.09 73.34 209 175.08 242.9 12.8 2.35 17.47-5.56 17.47-12.34 0-6.08-.22-22.18-.35-43.54-71.2 15.49-86.2-34.34-86.2-34.34-11.64-29.57-28.42-37.45-28.42-37.45-23.27-15.84 1.73-15.55 1.73-15.55 25.69 1.81 39.21 26.38 39.21 26.38 22.84 39.12 59.92 27.82 74.5 21.27 2.33-16.54 8.94-27.82 16.25-34.22-56.84-6.43-116.6-28.43-116.6-126.49 0-27.95 10-50.8 26.35-68.69-2.63-6.48-11.42-32.5 2.51-67.75 0 0 21.49-6.88 70.4 26.24a242.65 242.65 0 0 1 128.18 0c48.87-33.13 70.33-26.24 70.33-26.24 14 35.25 5.18 61.27 2.55 67.75 16.41 17.9 26.31 40.75 26.31 68.69 0 98.35-59.85 120-116.88 126.32 9.19 7.9 17.38 23.53 17.38 47.41 0 34.22-.31 61.83-.31 70.23 0 6.85 4.61 14.81 17.6 12.31C438.72 464.97 512 369.08 512 256.02 512 114.62 397.37 0 256 0z"/></svg></a> • 143 <a href="https://twitter.com/imagemagick" target="_blank" rel="noopener" aria-label="Twitter"><svg xmlns="http://www.w3.org/2000/svg" class="navbar-nav-svg" viewBox="0 0 512 416.32" width="2%" height="2%" role="img" focusable="false"><title>Twitter</title><path fill="currentColor" d="M160.83 416.32c193.2 0 298.92-160.22 298.92-298.92 0-4.51 0-9-.2-13.52A214 214 0 0 0 512 49.38a212.93 212.93 0 0 1-60.44 16.6 105.7 105.7 0 0 0 46.3-58.19 209 209 0 0 1-66.79 25.37 105.09 105.09 0 0 0-181.73 71.91 116.12 116.12 0 0 0 2.66 24c-87.28-4.3-164.73-46.3-216.56-109.82A105.48 105.48 0 0 0 68 159.6a106.27 106.27 0 0 1-47.53-13.11v1.43a105.28 105.28 0 0 0 84.21 103.06 105.67 105.67 0 0 1-47.33 1.84 105.06 105.06 0 0 0 98.14 72.94A210.72 210.72 0 0 1 25 370.84a202.17 202.17 0 0 1-25-1.43 298.85 298.85 0 0 0 160.83 46.92"/></svg></a> 144 <br/> 145 <small>© 1999-2021 ImageMagick Studio LLC</small> 146 </div> 147 </footer> 148 149 <!-- Javascript assets --> 150 <script src="assets/magick.js" ></script> 151 </body> 152</html> 153<!-- Magick Cache 13th February 2021 11:37 -->
