1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
2 <html xmlns="http://www.w3.org/1999/xhtml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="-//W3C//DTD XHTML 1.1//EN" xml:lang="en" xsi:schemaLocation="http://www.w3.org/1999/xhtml http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd">
4 <meta http-equiv="content-type" content="text/html; charset=UTF-8"></meta>
5 <meta name="google-site-verification" content="_bMOCDpkx9ZAzBwb2kF3PRHbfUUdFj2uO8Jd1AXArz4"></meta>
6 <title>ImageMagick: High Dynamic-Range Images</title>
7 <meta http-equiv="content-language" content="en-US"></meta>
8 <meta http-equiv="content-type" content="text/html; charset=utf-8"></meta>
9 <meta http-equiv="reply-to" content="magick-users@imagemagick.org"></meta>
10 <meta name="application-name" content="ImageMagick"></meta>
11 <meta name="description" content="Use ImageMagick to convert, edit, or compose bitmap images in a variety of formats. In addition, resize, rotate, shear, distort or transform images automagically."></meta>
12 <meta name="application-url" content="http://www.imagemagick.org"></meta>
13 <meta name="generator" content="PHP"></meta>
14 <meta name="keywords" content="high, dynamic-range, images, ImageMagick, PerlMagick, image processing, OpenMP, software development library, image, photo, software, Magick++, MagickWand"></meta>
15 <meta name="rating" content="GENERAL"></meta>
16 <meta name="robots" content="INDEX, FOLLOW"></meta>
17 <meta name="generator" content="ImageMagick Studio LLC"></meta>
18 <meta name="author" content="ImageMagick Studio LLC"></meta>
19 <meta name="revisit-after" content="2 DAYS"></meta>
20 <meta name="resource-type" content="document"></meta>
21 <meta name="copyright" content="Copyright (c) 1999-2012 ImageMagick Studio LLC"></meta>
22 <meta name="distribution" content="Global"></meta>
23 <link rel="icon" href="../images/wand.png"></link>
24 <link rel="shortcut icon" href="../images/wand.ico" type="images/x-icon"></link>
25 <link rel="canonical" href="../index.html"></link>
26 <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"></link>
28 <!-- Add jQuery library -->
29 <script type="text/javascript" src="http://localhost/ajax/libs/jquery/1.7/jquery.min.js"></script>
31 <!-- Add mousewheel plugin (this is optional) -->
32 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/lib/jquery.mousewheel-3.0.6.pack.js"></script>
35 <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/source/jquery.fancybox.css?v=2.0.6" type="text/css" media="screen"></link>
36 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/source/jquery.fancybox.pack.js?v=2.0.6"></script>
38 <!-- Optionally add helpers - button, thumbnail and/or media -->
39 <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/source/helpers/jquery.fancybox-buttons.css?v=1.0.2" type="text/css" media="screen"></link>
40 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/source/helpers/jquery.fancybox-buttons.js?v=1.0.2"></script>
41 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/source/helpers/jquery.fancybox-media.js?v=1.0.0"></script>
43 <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/source/helpers/jquery.fancybox-thumbs.css?v=2.0.6" type="text/css" media="screen"></link>
44 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/source/helpers/jquery.fancybox-thumbs.js?v=2.0.6"></script>
46 <script type="text/javascript">
47 $(document).ready(function() {
48 $(".fancybox").fancybox();
52 <!-- ImageMagick style -->
53 <style type="text/css" media="all">
54 @import url("../www/magick.css");
58 <body id="www-imagemagick-org">
62 <div class="titlebar">
63 <div style="margin: 17px auto; float: left;">
64 <script type="text/javascript">
66 google_ad_client = "pub-3129977114552745";
67 google_ad_slot = "5439289906";
68 google_ad_width = 728;
69 google_ad_height = 90;
74 <a href="../discourse-server">
75 <img src="../images/logo.jpg" alt="ImageMagick Logo" style="width: 123px; height: 118px; border: 0px; float: right;"></img></a>
76 <a href="../index.html">
77 <img src="../images/sprite.jpg" alt="ImageMagick Sprite" style="width: 114px; height: 118px; border: 0px; float: right;"></img></a>
83 <a title="About ImageMagick" href="../index.html">About ImageMagick</a>
86 <a title="Binary Releases" href="binary-releases.html">Binary Releases</a>
89 <a title="Binary Release: Unix" href="binary-releases.html#unix">Unix</a>
92 <a title="Binary Release: MacOS X" href="binary-releases.html#macosx">Mac OS X</a>
95 <a title="Binary Release: iOS" href="binary-releases.html#iOS">iOS</a>
98 <a title="Binary Release: Windows" href="binary-releases.html#windows">Windows</a>
100 <div class="sep"></div>
102 <a title="Command-line Tools" href="command-line-tools.html">Command-line Tools</a>
105 <a title="Command-line Tools: Processing" href="command-line-processing.html">Processing</a>
108 <a title="Command-line Tools: Options" href="command-line-options.html">Options</a>
111 <a title="Command-line Tools: Usage" href="http://www.imagemagick.org/Usage/">Usage</a>
114 <a title="Program Interfaces" href="api.html">Program Interfaces</a>
117 <a title="Program Interface: MagickWand" href="magick-wand.html">MagickWand</a>
120 <a title="Program Interface: MagickCore" href="magick-core.html">MagickCore</a>
123 <a title="Program Interface: PerlMagick" href="perl-magick.html">PerlMagick</a>
126 <a title="Program Interface: Magick++" href="magick++.html">Magick++</a>
128 <div class="sep"></div>
130 <a title="Install from Source" href="install-source.html">Install from Source</a>
133 <a title="Install from Source: Unix" href="install-source.html#unix">Unix</a>
136 <a title="Install from Source: Windows" href="install-source.html#windows">Windows</a>
139 <a title="Resources" href="resources.html">Resources</a>
142 <a title="Architecture" href="architecture.html">Architecture</a>
145 <a title="Download" href="download.html">Download</a>
147 <div class="sep"></div>
149 <a title="Search" href="search.html">Search</a>
151 <div class="sep"></div>
153 <a title="Site Map" href="sitemap.html">Site Map</a>
156 <a title="Site Map: Links" href="links.html">Links</a>
158 <div class="sep"></div>
160 <a title="Support ImageMagick Development" href="support.html">Support ImageMagick Development</a>
164 <div class="eastbar">
166 <div> <a class="FlattrButton" style="display:none;" rev="flattr;button:compact;" href="../index.html"></a></div>
168 <a href="http://flattr.com/thing/947300/Convert-Edit-And-Compose-Images" target="_blank">
169 <img src="http://api.flattr.com/button/flattr-badge-large.png" alt="Flattr this" title="Flattr this" width="93" height="20" border="0"></img></a>
178 <h1>ImageMagick High Dynamic-range Imaging</h1>
179 <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>
182 <div class="doc-section">
184 <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>
187 <li>render/capture floating-point color space</li>
188 <li>encompass the entire perceivable gamut (extend values outside [0,1] range)</li>
189 <li>post-process in extended color space</li>
190 <li>apply tone-mapping for specific display</li>
195 <h2><a id="enable"></a>Enabling HDRI in ImageMagick</h2>
196 <div class="doc-section">
198 <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>
200 <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>
202 <p>To enable the HDRI version of ImageMagick, use this Unix/Linux command:</p>
204 <p class="crt"><span class="crtprompt"> $ </span><span class="crtin">./configure --enable-hdri</span></p>
205 <p>Under Windows, set the <code>MAGICKCORE_HDRI_SUPPORT</code> definition in the <code>magick-config.h</code> configuration file and build.</p>
207 <p>To verify HDRI is properly configured, look for "HDRI" as a feature:</p>
209 <p class="crt"><span class="crtprompt"> $ </span><span class="crtin">identify -version</span><span class="crtout">Features: OpenMP HDRI</span></p></div>
214 <span id="linkbar-west"> </span>
216 <span id="linkbar-center">
217 <a href="http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> •
218 <a href="../discourse-server">Discourse Server</a> •
219 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a> •
220 <a href="http://jqmagick.imagemagick.org/">JqMagick</a>
222 <span id="linkbar-east"> </span>
225 <span id="footer-west">© 1999-2014 ImageMagick Studio LLC</span>
226 <span id="footer-east"> <a href="contact.html">Contact the Wizards</a></span>
228 <div style="clear: both; margin: 0; width: 100%; "></div>