| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" |
| "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> |
| <html version="-//W3C//DTD XHTML 1.1//EN" |
| xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" |
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
| xsi:schemaLocation="http://www.w3.org/1999/xhtml |
| http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd"> |
| <head> |
| <meta http-equiv="content-type" content="text/html; charset=UTF-8"/> |
| <meta name="google-site-verification" content="MxsMq6bdLOx0KSuz1MY6yG9ZTIJ7_7DVRfl5NCAT5Yg"/> |
| <title>ImageMagick: High Dynamic-Range Images</title> |
| <meta http-equiv="content-language" content="en-US"/> |
| <meta http-equiv="content-type" content="text/html; charset=utf-8"/> |
| <meta http-equiv="reply-to" content="magick-users@imagemagick.org"/> |
| <meta name="application-name" content="ImageMagick"/> |
| <meta name="description" content="Use ImageMagick to convert, edit, or compose bitmap images in a variety of formats. In addition resize, rotate, shear, distort and transform images automagically."/> |
| <meta name="application-url" content="http://www.imagemagick.org"/> |
| <meta name="generator" content="PHP"/> |
| <meta name="keywords" content="high, dynamic-range, images, ImageMagick, PerlMagick, image processing, OpenMP, software development library, image, photo, software, Magick++, MagickWand"/> |
| <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) 1999-2012 ImageMagick Studio LLC"/> |
| <meta name="distribution" content="Global"/> |
| <link rel="icon" href="../images/wand.png"/> |
| <link rel="shortcut icon" href="../images/wand.ico" type="images/x-icon"/> |
| <link rel="canonical" href="http://www.imagemagick.org" /> |
| <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"/> |
| <!-- Add jQuery library --> |
| <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script> |
| |
| <!-- Optionaly include easing and/or mousewheel plugins --> |
| <script type="text/javascript" src="http://www.imagemagick.org/fancybox/jquery.easing-1.3.pack.js"></script> |
| <script type="text/javascript" src="http://www.imagemagick.org/fancybox/jquery.mousewheel-3.0.6.pack.js"></script> |
| |
| <!-- Add fancyBox --> |
| <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/jquery.fancybox.css?v=2.0.4" type="text/css" media="screen" /> |
| <script type="text/javascript" src="http://www.imagemagick.org/fancybox/jquery.fancybox.pack.js?v=2.0.4"></script> |
| |
| <!-- Optionaly include button and/or thumbnail helpers --> |
| <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-buttons.css?v=2.0.4" type="text/css" media="screen" /> |
| <script type="text/javascript" src="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-buttons.js?v=2.0.4"></script> |
| |
| <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-thumbs.css?v=2.0.4" type="text/css" media="screen" /> |
| <script type="text/javascript" src="http://www.imagemagick.org/fancybox/helpers/jquery.fancybox-thumbs.js?v=2.0.4"></script> |
| <script type="text/javascript"> |
| $(document).ready(function() { |
| $(".fancybox").fancybox(); |
| }); |
| </script> |
| <!-- ImageMagick style --> |
| <link rel="stylesheet" href="http://www.google.com/cse/style/look/default.css" type="text/css" /> |
| <style type="text/css" media="all"> |
| @import url("../www/magick.css"); |
| </style> |
| </head> |
| |
| <body id="www-imagemagick-org"> |
| <div class="titlebar"> |
| <div style="margin: 17px auto; float: left;"> |
| <script type="text/javascript"> |
| <!-- |
| google_ad_client = "pub-3129977114552745"; |
| google_ad_slot = "5439289906"; |
| google_ad_width = 728; |
| google_ad_height = 90; |
| //--> |
| </script> |
| <script type="text/javascript" |
| src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> |
| </script> |
| </div> |
| <a href="../discourse-server"> |
| <img src="../images/logo.jpg" |
| alt="ImageMagick Logo" |
| style="width: 123px; height: 118px; border: 0px; float: right;" /></a> |
| <a href="../index.html"> |
| <img src="../images/sprite.jpg" |
| alt="ImageMagick Sprite" |
| style="width: 114px; height: 118px; border: 0px; float: right;" /></a> |
| </div> |
| |
| <div class="westbar"> |
| |
| <div class="menu"> |
| <a title="About ImageMagick" href="../index.html">About ImageMagick</a> |
| </div> |
| <div class="menu"> |
| <a title="Binary Releases" href="binary-releases.html">Binary Releases</a> |
| </div> |
| <div class="sub"> |
| <a title="Binary Release: Unix" href="binary-releases.html#unix">Unix</a> |
| </div> |
| <div class="sub"> |
| <a title="Binary Release: MacOS X" href="binary-releases.html#macosx">Mac OS X</a> |
| </div> |
| <div class="sub"> |
| <a title="Binary Release: iOS" href="binary-releases.html#iOS">iOS</a> |
| </div> |
| <div class="sub"> |
| <a title="Binary Release: Windows" href="binary-releases.html#windows">Windows</a> |
| </div> |
| <div class="sep"></div> |
| <div class="menu"> |
| <a title="Command-line Tools" href="command-line-tools.html">Command-line Tools</a> |
| </div> |
| <div class="sub"> |
| <a title="Command-line Tools: Processing" href="command-line-processing.html">Processing</a> |
| </div> |
| <div class="sub"> |
| <a title="Command-line Tools: Options" href="command-line-options.html">Options</a> |
| </div> |
| <div class="sub"> |
| <a title="Command-line Tools: Usage" href="http://www.imagemagick.org/Usage/">Usage</a> |
| </div> |
| <div class="menu"> |
| <a title="Program Interfaces" href="api.html">Program Interfaces</a> |
| </div> |
| <div class="sub"> |
| <a title="Program Interface: MagickWand" href="magick-wand.html">MagickWand</a> |
| </div> |
| <div class="sub"> |
| <a title="Program Interface: MagickCore" href="magick-core.html">MagickCore</a> |
| </div> |
| <div class="sub"> |
| <a title="Program Interface: PerlMagick" href="perl-magick.html">PerlMagick</a> |
| </div> |
| <div class="sub"> |
| <a title="Program Interface: Magick++" href="magick++.html">Magick++</a> |
| </div> |
| <div class="sep"></div> |
| <div class="menu"> |
| <a title="Install from Source" href="install-source.html">Install from Source</a> |
| </div> |
| <div class="sub"> |
| <a title="Install from Source: Unix" href="install-source.html#unix">Unix</a> |
| </div> |
| <div class="sub"> |
| <a title="Install from Source: Windows" href="install-source.html#windows">Windows</a> |
| </div> |
| <div class="menu"> |
| <a title="Resources" href="resources.html">Resources</a> |
| </div> |
| <div class="menu"> |
| <a title="Architecture" href="architecture.html">Architecture</a> |
| </div> |
| <div class="menu"> |
| <a title="Download" href="download.html">Download</a> |
| </div> |
| <div class="sep"></div> |
| <div class="menu"> |
| <a title="Search" href="search.html">Search</a> |
| </div> |
| <div class="sep"></div> |
| <div class="menu"> |
| <a title="Site Map" href="sitemap.html">Site Map</a> |
| </div> |
| <div class="sub"> |
| <a title="Site Map: Links" href="links.html">Links</a> |
| </div> |
| <div class="sep"></div> |
| <div class="menu"> |
| <a rel="follow" title="Sponsors" href="sponsors.html">Sponsors:</a> |
| |
| <a href="http://www.networkredux.com"> <img src="../images/networkredux.png" width="140" height="31" alt="[sponsor]" style="margin-top: 4px; margin-left: 4px; border: 0px; float: left;" /></a> |
| <a href="http://www.dinodirect.com/ipads-tablets/"> <img src="../images/dino-direct.jpg" width="140" height="90" alt="[sponsor]" style="margin-top: 4px; margin-left: 4px; border: 0px; float: left;" /></a><!-- 201208010120 mickey@163... --> |
| <div class="sponsbox"> |
| <div class="sponsor"> |
| <a rel="follow" title="Sponsor: The Fastest & Easiest Way to Find Images" href="http://www.graphicsfactory.com">The Fastest & Easiest Way to Find Images</a><!-- 201210010270 graphicsfac... --> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Sponsor: VPS" href="http://www.interdominios.com/vps">VPS</a><!-- 201209010090 barsh@inter... --> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Werbebanner Werbeplane" href="http://www.allesbanner.de">Werbebanner Werbeplane</a><!-- 201212010450 info@druck... --> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Entertainment News & Photos" href="http://www.zimbio.com">Entertainment News & Photos</a><!-- 201211010540 bd@zimb... --> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Sponsor: LED24" href="http://led24.de/">LED24</a><!-- 201207010270 info@led24... --> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Sponsor: Best Website Hosting" href="http://www.top-cheap-web-hosting.com">Best Website Hosting</a><!-- 201304010090 eunge.liu--> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Android Tablet" href="http://www.dinodirect.com/ipads-tablets/">Android Tablet</a><!-- 201208010120 mickey@163... --> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Sponsor: Web Site Hosting" href="http://webhostinggeeks.com">Web Site Hosting</a><!-- 201302010900 funds@enmob... --> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Sponsor: Premium Quality Stock Photos" href="http://www.f1online.pro/en/">Premium Quality Stock Photos</a><!-- 2012080100540 ... --> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 2012070100250 ... --> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Sponsor: Managed Server" href="http://www.robhost.de">Managed Server</a><!-- 201210010720 klikics... --> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Sponsor: Druckerei" href="http://www.allesdruck.de">Druckerei</a><!-- 201303011500 r.leo --> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Sponsor: Notebook Reparatur" href="http://www.notebook-reparaturen-berlin.de">Notebook Reparatur</a><!-- 2012080100300 atlas-multimedia--> |
| </div> |
| <div class="sponsor"> |
| <a rel="follow" title="Sponsor: Web Hosting" href="http://www.hostucan.com">Web Hosting</a><!-- 2012120100150 racent marketing@webhosting...--> |
| </div> |
| </div> |
| </div> |
| </div> |
| |
| <div class="eastbar"> |
| <div class="g-plusone" id="gplusone"></div> |
| <script type="text/javascript"> |
| window.___gcfg = { |
| lang: 'en-US' |
| }; |
| |
| (function() { |
| var po = document.createElement('script'); |
| po.type = 'text/javascript'; po.async = true; |
| po.src = 'https://apis.google.com/js/plusone.js'; |
| var script = document.getElementsByTagName('script')[0]; |
| script.parentNode.insertBefore(po, script); |
| })(); |
| var gplusone = document.getElementById("gplusone"); |
| gplusone.setAttribute("data-size","medium"); |
| gplusone.setAttribute("data-count","false"); |
| </script> |
| </div> |
| |
| <div class="main"> |
| |
| |
| <h1>ImageMagick High Dynamic-range Imaging</h1> |
| <p class="navigation-index">[<a href="high-dynamic-range.html#intro">Introduction to High Dynamic-Range Images</a> • <a href="high-dynamic-range.html#enable">Enabling HDRI in ImageMagick</a>]</p> |
| |
| <a id="intro"></a> |
| <div class="doc-section"> |
| |
| <p>High dynamic-range imaging (HDRI) permits a far greater dynamic range of exposures (i.e. a large difference between light and dark areas) than standard digital imaging techniques. HDRI accurately represents the wide range of intensity levels found in real scenes ranging from the brightest direct sunlight to the deepest darkest shadows. The HDR imaging approach includes:</p> |
| |
| <ul> |
| <li>render/capture floating-point color space</li> |
| <li>encompass the entire perceivable gamut (extend values outside [0,1] range)</li> |
| <li>post-process in extended color space</li> |
| <li>apply tone-mapping for specific display</li> |
| </ul> |
| |
| </div> |
| |
| <h2><a id="enable"></a>Enabling HDRI in ImageMagick</h2> |
| <div class="doc-section"> |
| |
| <p>By default, image pixels in ImageMagick are stored as unsigned values that range from 0 to the quantum depth, which is typically 16-bits (Q16). With HDRI enabled, the pixels are stored in a floating-point representation and can include negative values as well as values that exceed the quantum depth. A majority of digital image formats do not support HDRI, and for those images any pixels outside the quantum range are clamped before they are stored.</p> |
| |
| <p>The most promising HDR image format is EXR. You must have the <a href="http://www.openexr.org">OpenEXR</a> delegate library installed to read or write this format. Other HDR formats include TIFF 48-bit integer and 96-bit float formats, HDR, PFM, and ImageMagick's own MIFF format.</p> |
| |
| <p>To enable the HDRI version of ImageMagick, use this Unix/Linux command:</p> |
| |
| <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>./configure --enable-hdri</span></p> |
| <p>Under Windows, set the <kbd>MAGICKCORE_HDRI_SUPPORT</kbd> definition in the <kbd>magick-config.h</kbd> configuration file and build.</p> |
| |
| <p>To verify HDRI is properly configured, look for "HDRI" as a feature:</p> |
| |
| <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>identify -version</span><span class='crtout'>Features: OpenMP HDRI</span></p></div> |
| |
| </div> |
| |
| <div id="linkbar"> |
| <span id="linkbar-west"> </span> |
| <span id="linkbar-center"> |
| <a href="../discourse-server">Discourse Server</a> • |
| <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a> |
| </span> |
| <span id="linkbar-east"> </span> |
| </div> |
| <div class="footer"> |
| <span id="footer-west">© 1999-2012 ImageMagick Studio LLC</span> |
| <span id="footer-east"> <a href="contact.html">Contact the Wizards</a></span> |
| </div> |
| <div style="clear: both; margin: 0; width: 100%; "></div> |
| <script type="text/javascript"> |
| var _gaq = _gaq || []; |
| _gaq.push(['_setAccount', 'UA-17690367-1']); |
| _gaq.push(['_trackPageview']); |
| |
| (function() { |
| var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; |
| ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; |
| var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); |
| })(); |
| </script> |
| </body> |
| </html> |