Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / ImageMagick / 417eeb10a37f4a75077f5b72a6d3af769a665552 / . / www / high-dynamic-range.html
blob: 11c5eac0db2481329e5188e8deb74c7766a67e3f [file] [log] [blame]
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]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">
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]3<head>
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]4 <meta http-equiv="content-type" content="text/html; charset=UTF-8"></meta>
5 <meta name="google-site-verification" content="_bMOCDpkx9ZAzBwb2kF3PRHbfUUdFj2uO8Jd1AXArz4"></meta>
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]6 <title>ImageMagick: High Dynamic-Range Images</title>
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]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="http://www.imagemagick.org"></link>
26 <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"></link>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]27
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]28 <!-- Add jQuery library -->
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]29 <script type="text/javascript" src="http://localhost/ajax/libs/jquery/1.7/jquery.min.js"></script>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]30
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]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>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]33
34 <!-- Add fancyBox -->
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]35 <link rel="stylesheet" href="http://www.imagemagick.org/fancybox/source/jquery.fancybox.css?v=2.0.6" type="text/css" media="screen"></link>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]36 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/source/jquery.fancybox.pack.js?v=2.0.6"></script>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]37
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]38 <!-- Optionally add helpers - button, thumbnail and/or media -->
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]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>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]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>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]42
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]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>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]44 <script type="text/javascript" src="http://www.imagemagick.org/fancybox/source/helpers/jquery.fancybox-thumbs.js?v=2.0.6"></script>
45
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]46 <script type="text/javascript">
47 $(document).ready(function() {
48 $(".fancybox").fancybox();
49 });
50 </script>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]51
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]52 <!-- ImageMagick style -->
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]53 <style type="text/css" media="all">
54 @import url("../www/magick.css");
55 </style>
56</head>
57
58<body id="www-imagemagick-org">
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]59
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]60
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]61
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]62<div class="titlebar">
63<div style="margin: 17px auto; float: left;">
64 <script type="text/javascript">
65 <!--
66 google_ad_client = "pub-3129977114552745";
67 google_ad_slot = "5439289906";
68 google_ad_width = 728;
69 google_ad_height = 90;
70 //-->
71 </script>
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]72
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]73</div>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]74<a href="http://www.imagemagick.org/discourse-server/">
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]75 <img src="../images/logo.jpg" alt="ImageMagick Logo" style="width: 123px; height: 118px; border: 0px; float: right;"></img></a>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]76<a href="../index.html">
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]77 <img src="../images/sprite.jpg" alt="ImageMagick Sprite" style="width: 114px; height: 118px; border: 0px; float: right;"></img></a>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]78</div>
79
80<div class="westbar">
81
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]82<div class="menu">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]83 <a title="About ImageMagick" href="../index.html">About ImageMagick</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]84</div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]85<div class="menu">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]86 <a title="Binary Releases" href="binary-releases.html">Binary Releases</a>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]87</div>
88<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]89 <a title="Binary Release: Unix" href="binary-releases.html#unix">Unix</a>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]90</div>
91<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]92 <a title="Binary Release: MacOS X" href="binary-releases.html#macosx">Mac OS X</a>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]93</div>
94<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]95 <a title="Binary Release: iOS" href="binary-releases.html#iOS">iOS</a>
cristyda16f162011-02-19 23:52:17 +0000[diff] [blame]96</div>
97<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]98 <a title="Binary Release: Windows" href="binary-releases.html#windows">Windows</a>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]99</div>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]100<div class="sep"></div>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]101<div class="menu">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]102 <a title="Command-line Tools" href="command-line-tools.html">Command-line Tools</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]103</div>
104<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]105 <a title="Command-line Tools: Processing" href="command-line-processing.html">Processing</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]106</div>
107<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]108 <a title="Command-line Tools: Options" href="command-line-options.html">Options</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]109</div>
110<div class="sub">
cristy83a272e2010-05-07 20:40:35 +0000[diff] [blame]111 <a title="Command-line Tools: Usage" href="http://www.imagemagick.org/Usage/">Usage</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]112</div>
113<div class="menu">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]114 <a title="Program Interfaces" href="api.html">Program Interfaces</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]115</div>
116<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]117 <a title="Program Interface: MagickWand" href="magick-wand.html">MagickWand</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]118</div>
119<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]120 <a title="Program Interface: MagickCore" href="magick-core.html">MagickCore</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]121</div>
122<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]123 <a title="Program Interface: PerlMagick" href="perl-magick.html">PerlMagick</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]124</div>
125<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]126 <a title="Program Interface: Magick++" href="magick++.html">Magick++</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]127</div>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]128<div class="sep"></div>
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]129<div class="menu">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]130 <a title="Install from Source" href="install-source.html">Install from Source</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]131</div>
132<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]133 <a title="Install from Source: Unix" href="install-source.html#unix">Unix</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]134</div>
135<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]136 <a title="Install from Source: Windows" href="install-source.html#windows">Windows</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]137 </div>
138<div class="menu">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]139 <a title="Resources" href="resources.html">Resources</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]140</div>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]141<div class="menu">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]142 <a title="Architecture" href="architecture.html">Architecture</a>
cristybb503372010-05-27 20:51:26 +0000[diff] [blame]143</div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]144<div class="menu">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]145 <a title="Download" href="download.html">Download</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]146</div>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]147<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]148<div class="menu">
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]149 <a title="Search" href="search.html">Search</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]150</div>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]151<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]152<div class="menu">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]153 <a title="Site Map" href="sitemap.html">Site Map</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]154</div>
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]155<div class="sub">
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]156 <a title="Site Map: Links" href="links.html">Links</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]157</div>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]158<div class="sep"></div>
cristyeed6cb62012-01-28 19:38:34 +0000[diff] [blame]159<div class="menu">
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]160 <a title="Support ImageMagick Development" href="support.html">Support ImageMagick Development</a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]161</div>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]162</div>
163
164<div class="eastbar">
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]165
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]166 <div> <a class="FlattrButton" style="display:none;" rev="flattr;button:compact;" href="http://www.imagemagick.org/"></a></div>
167 <noscript>
168 <a href="http://flattr.com/thing/947300/Convert-Edit-And-Compose-Images" target="_blank">
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]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>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]170 </noscript>
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]171
172
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]173</div>
174
175<div class="main">
176
177
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]178<h1>ImageMagick High Dynamic-range Imaging</h1>
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]180
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]181<a id="intro"></a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]182<div class="doc-section">
183
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>
185
186<ul>
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>
191</ul>
192
193</div>
194
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]195<h2><a id="enable"></a>Enabling HDRI in ImageMagick</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]196<div class="doc-section">
197
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>
199
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>
201
202<p>To enable the HDRI version of ImageMagick, use this Unix/Linux command:</p>
203
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]204<p class="crt"><span class="crtprompt"> $ </span><span class="crtin">./configure --enable-hdri</span></p>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]205<p>Under Windows, set the <code>MAGICKCORE_HDRI_SUPPORT</code> definition in the <code>magick-config.h</code> configuration file and build.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]206
cristybebec402010-04-23 19:19:08 +0000[diff] [blame]207<p>To verify HDRI is properly configured, look for "HDRI" as a feature:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]208
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]209<p class="crt"><span class="crtprompt"> $ </span><span class="crtin">identify -version</span><span class="crtout">Features: OpenMP HDRI</span></p></div>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]210
211</div>
212
213<div id="linkbar">
cristyac1b4322013-07-28 13:58:06 +0000[diff] [blame]214 <span id="linkbar-west"> </span>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]215
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]216 <span id="linkbar-center">
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame^]217 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> •
218 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a> •
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]219 <a href="http://jqmagick.imagemagick.org/">JqMagick</a>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]220 </span>
cristyac1b4322013-07-28 13:58:06 +0000[diff] [blame]221 <span id="linkbar-east"> </span>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]222 </div>
223 <div class="footer">
cristyac1b4322013-07-28 13:58:06 +0000[diff] [blame]224 <span id="footer-west">© 1999-2013 ImageMagick Studio LLC</span>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]225 <span id="footer-east"> <a href="contact.html">Contact the Wizards</a></span>
226 </div>
227 <div style="clear: both; margin: 0; width: 100%; "></div>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]228</body>
229</html>