| <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
|
| "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
|
| <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" dir="ltr">
|
| <head>
|
| <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
|
| <meta name="verify-v1" content="g222frIIxcQTrvDR3NBRUSKP3AnMNoqxOkIniCEkV7U=" />
|
| <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf" />
|
| <style type="text/css" media="all">
|
| @import url("../www/magick.css");
|
| </style>
|
| <link rel="shortcut icon" href="../images/wand.ico" type="images/vnd.microsoft.icon"/> |
| <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="Generator" content="PHP"/> |
| <meta name="Keywords" content="high, dynamic-range, images, ImageMagick, ImageMagic, MagickCore, MagickWand, PerlMagick, Magick++, RMagick, PythonMagick, JMagick, TclMagick, Image, Magick, Magic, Wand, ImageMagickObject, Swiss, Army, Knife, Image, Processing"/> |
| <meta name="Description" content="ImageMagick® is a software suite to create, edit, and compose bitmap images. It can read, convert and write images in a variety of formats (about 100) including GIF, JPEG, JPEG-2000, PNG, PDF, PhotoCD, TIFF, and DPX. Use ImageMagick to translate, flip, mirror, rotate, scale, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves. ImageMagick is free software delivered as a ready-to-run binary distribution or as source code that you can freely use, copy, modify, and distribute. Its license is compatible with the GPL. It runs on all major operating systems. The functionality of ImageMagick is typically utilized from the command line or you can use the features from programs written in your favorite programming language. Choose from these interfaces: MagickCore (C), MagickWand (C), ChMagick (Ch), Magick++ (C++), JMagick (Java), L-Magick (Lisp), PascalMagick (Pascal), PerlMagick (Perl), MagickWand for PHP (PHP), PythonMagick (Python), RMagick (Ruby), or TclMagick (Tcl/TK). With a language interface, use ImageMagick to modify or create images automagically and dynamically."/> |
| <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) 1999-2010 ImageMagick Studio LLC"/> |
| <meta name="Distribution" content="Global"/> |
| </head>
|
|
|
| <body id="www-imagemagick-org">
|
| <div class="titlebar">
|
| <a href="../index.html">
|
| <img src="../images/script.png" alt="[ImageMagick]"
|
| style="width: 350px; height: 60px; margin: 28px auto; float: left;" /></a>
|
| <a href="http://www.networkredux.com">
|
| <img src="../images/networkredux.png" alt="[sponsor]"
|
| style="margin: 45px auto; border: 0px; float: left;" /></a>
|
| <a href="http://www.imagemagick.org/discourse-server/">
|
| <img src="../images/logo.jpg" alt=""
|
| style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
|
| <a href="../index.html">
|
| <img src="../images/sprite.jpg" alt=""
|
| style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
|
| </div>
|
|
|
| <div class="eastbar">
|
|
|
| <div class="menu"> |
| <a title="About ImageMagick" href="../index.html">About ImageMagick</a> |
| </div> |
| <div class="sep"></div>
|
| <div class="menu"> |
| <a title="Command-line Tools" href="../www/command-line-tools.html">Command-line Tools</a> |
| </div> |
| <div class="sub"> |
| <a title="Command-line Tools: Processing" href="../www/command-line-processing.html">Processing</a> |
| </div> |
| <div class="sub"> |
| <a title="Command-line Tools: Options" href="../www/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="../www/api.html">Program Interfaces</a> |
| </div> |
| <div class="sub"> |
| <a title="Program Interface: MagickWand" href="../www/magick-wand.html">MagickWand</a> |
| </div> |
| <div class="sub"> |
| <a title="Program Interface: MagickCore" href="../www/magick-core.html">MagickCore</a> |
| </div> |
| <div class="sub"> |
| <a title="Program Interface: PerlMagick" href="../www/perl-magick.html">PerlMagick</a> |
| </div> |
| <div class="sub"> |
| <a title="Program Interface: Magick++" href="../Magick++/">Magick++</a> |
| </div> |
| <div class="menu"> |
| <a title="Architecture" href="../www/architecture.html">Architecture</a> |
| </div> |
| <div class="sep"></div>
|
| <div class="menu"> |
| <a title="Install from Source" href="../www/install-source.html">Install from Source</a> |
| </div> |
| <div class="sub"> |
| <a title="Install from Source: Unix" href="../www/install-source.html#unix">Unix</a> |
| </div> |
| <div class="sub"> |
| <a title="Install from Source: Windows" href="../www/install-source.html#windows">Windows</a> |
| </div> |
| <div class="menu"> |
| <a title="Binary Releases" href="../www/binary-releases.html">Binary Releases</a> |
| </div> |
| <div class="sub"> |
| <a title="Binary Release: Unix" href="../www/binary-releases.html#unix">Unix</a> |
| </div> |
| <div class="sub"> |
| <a title="Binary Release: MacOS X" href="../www/binary-releases.html#macosx">Mac OS X</a> |
| </div> |
| <div class="sub"> |
| <a title="Binary Release: Windows" href="../www/binary-releases.html#windows">Windows</a> |
| </div> |
| <div class="menu"> |
| <a title="Resources" href="../www/resources.html">Resources</a> |
| </div> |
| <div class="sep"></div>
|
| <div class="menu"> |
| <a title="Download" href="../www/download.html">Download</a> |
| </div> |
| <div class="sep"></div>
|
| <div class="menu"> |
| <a title="Search" href="http://www.imagemagick.org/script/search.php">Search</a> |
| </div> |
| <div class="sep"></div>
|
| <div class="menu"> |
| <a title="Site Map"href="../www/sitemap.html">Site Map</a> |
| </div> |
| <div class="sub"> |
| <a title="Site Map: Links"href="../www/links.html">Links</a> |
| </div> |
| <div class="sep"></div>
|
| <div class="menu"> |
| <a title="Sponsors" href="../www/sponsors.html">Sponsors:</a> |
| |
| <div class="sponsbox"> |
| <div class="sponsor"> |
| <a title="Sponsor: Webdesign Agentur" href="http://www.ventzke-partner.de">Webdesign Agentur</a><!-- 201101010480 invendio.de--> |
| </div> |
| <div class="sponsor"> |
| <a title="Sponsor: LVM Versicherung" href="http://www.neu-reich.de">LVM Versicherung</a><!-- 201101010480 --> |
| </div> |
| <div class="sponsor"> |
| <a title="Sponsor: Deko.net" href="http://www.deko.net">Deko.net</a><!-- 201101010600 Peterssen--> |
| </div> |
| <div class="sponsor"> |
| <a title="Sponsor: Kredit" href="http://www.online-kredit-index.de">Kredit</a><!-- 201007010120 Buchhorn --> |
| </div> |
| <div class="sponsor"> |
| <a title="Sponsor: Druckerei" href="http://www.print24.de/">Druckerei</a><!-- 201009010720 --> |
| </div> |
| <div class="sponsor"> |
| <a title="Sponsor: Druckerei Online" href="http://www.allesdruck.de">Druckerei Online</a><!-- 201012011200 allesdruck.de--> |
| </div> |
| <div class="sponsor"> |
| <a title="Sponsor: Online-Magazin" href="http://www.unkostenbeitrag.de/" title="Online-Magazin">Online-Magazin</a><!-- 20101101000200 --> |
| </div> |
| </div> |
| </div> |
|
|
|
|
| </div>
|
|
|
| <div class="main">
|
|
|
|
|
| <p class="navigation-index">[<a href="#intro">Introduction to High Dynamic-Range Images</a> • <a href="#enable">Enabling HDRI in ImageMagick</a>]</p> |
| |
| <h2><a name="intro"></a>Introduction to High Dynamic-Range Images</h2> |
| <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 name="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"> $magick> </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"> $magick> </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="http://www.imagemagick.org/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">© 1999-2010 ImageMagick Studio LLC</span>
|
| <span id="footer-east"> <a href="http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
|
| </div>
|
| <div style="clear: both; margin: 0; width: 100%; "></div>
|
| </body>
|
| </html>
|