Gitiles
Code Review Sign In
gerrit-public.fairphone.software / platform / external / ImageMagick / 8d137bfc75b5eaf3428695cbe15d6b12fe62fd19 / . / www / high-dynamic-range.html
blob: 765c237f1017b10c9b375a4043d7e047e5f83ab1 [file] [log] [blame]
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
2 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
cristy2c839602010-04-03 02:32:08 +0000[diff] [blame]3<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en" dir="ltr">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]4<head>
cristy3de29cc2010-04-15 02:34:44 +0000[diff] [blame]5 <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]6 <meta name="verify-v1" content="g222frIIxcQTrvDR3NBRUSKP3AnMNoqxOkIniCEkV7U=" />
7 <link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf" />
cristy3de29cc2010-04-15 02:34:44 +0000[diff] [blame]8 <style type="text/css" media="all">
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]9 @import url("../www/magick.css");
cristy3de29cc2010-04-15 02:34:44 +0000[diff] [blame]10 </style>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]11 <link rel="shortcut icon" href="../images/wand.ico" type="images/vnd.microsoft.icon"/>
12 <title>ImageMagick: High Dynamic-Range Images</title>
13 <meta http-equiv="Content-Language" content="en-US"/>
14 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
15 <meta http-equiv="Reply-to" content="magick-users@imagemagick.org"/>
16 <meta name="Generator" content="PHP"/>
17 <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"/>
18 <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."/>
19 <meta name="Rating" content="GENERAL"/>
20 <meta name="Robots" content="INDEX, FOLLOW"/>
21 <meta name="Generator" content="ImageMagick Studio LLC"/>
22 <meta name="Author" content="ImageMagick Studio LLC"/>
23 <meta name="Revisit-after" content="2 DAYS"/>
24 <meta name="Resource-type" content="document"/>
cristy16af1cb2009-12-11 21:38:29 +0000[diff] [blame]25 <meta name="Copyright" content="Copyright (c) 1999-2010 ImageMagick Studio LLC"/>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]26 <meta name="Distribution" content="Global"/>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]27</head>
28
29<body id="www-imagemagick-org">
30<div class="titlebar">
31<a href="../index.html">
32 <img src="../images/script.png" alt="[ImageMagick]"
33 style="width: 350px; height: 60px; margin: 28px auto; float: left;" /></a>
34<a href="http://www.networkredux.com">
35 <img src="../images/networkredux.png" alt="[sponsor]"
36 style="margin: 45px auto; border: 0px; float: left;" /></a>
37<a href="http://www.imagemagick.org/discourse-server/">
38 <img src="../images/logo.jpg" alt=""
39 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
40<a href="../index.html">
41 <img src="../images/sprite.jpg" alt=""
42 style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
43</div>
44
45<div class="eastbar">
46
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]47<div class="menu">
48 <a href="../index.html">About ImageMagick</a>
49</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]50<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]51<div class="menu">
52 <a href="../www/command-line-tools.html">Command-line Tools</a>
53</div>
54<div class="sub">
55 <a href="../www/command-line-processing.html">Processing</a>
56</div>
57<div class="sub">
58 <a href="../www/command-line-options.html">Options</a>
59</div>
60<div class="sub">
61 <a href="http://www.imagemagick.org/Usage/">Usage</a>
62</div>
63<div class="menu">
64 <a href="../www/api.html">Program Interfaces</a>
65</div>
66<div class="sub">
67 <a href="../www/magick-wand.html">MagickWand</a>
68</div>
69<div class="sub">
70 <a href="../www/magick-core.html">MagickCore</a>
71</div>
72<div class="sub">
73 <a href="../www/perl-magick.html">PerlMagick</a>
74</div>
75<div class="sub">
76 <a href="../Magick++/">Magick++</a>
77</div>
78<div class="menu">
79 <a href="../www/architecture.html">Architecture</a>
80</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]81<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]82<div class="menu">
83 <a href="../www/install-source.html">Install from Source</a>
84</div>
85<div class="sub">
86 <a href="../www/install-source.html#unix">Unix</a>
87</div>
88<div class="sub">
89 <a href="../www/install-source.html#windows">Windows</a>
90 </div>
91<div class="menu">
92 <a href="../www/binary-releases.html">Binary Releases</a>
93</div>
94<div class="sub">
95 <a href="../www/binary-releases.html#unix">Unix</a>
96</div>
97<div class="sub">
98 <a href="../www/binary-releases.html#macosx">Mac OS X</a>
99</div>
100<div class="sub">
101 <a href="../www/binary-releases.html#windows">Windows</a>
102</div>
103<div class="menu">
104 <a href="../www/resources.html">Resources</a>
105</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]106<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]107<div class="menu">
108 <a href="../www/download.html">Download</a>
109</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]110<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]111<div class="menu">
112 <a href="http://www.imagemagick.org/script/search.php">Search</a>
113</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]114<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]115<div class="menu">
116 <a href="../www/sitemap.html">Site Map</a>
117</div>
118<div class="sub">
119 <a href="../www/links.html">Links</a>
120</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]121<div class="sep"></div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]122<div class="menu">
123 <a href="../www/sponsors.html">Sponsors:</a>
124
125<div class="sponsbox">
126<div class="sponsor">
cristy3225a072010-04-17 01:47:28 +0000[diff] [blame]127 <a href="http://www.geschenke-elsen.de/" title="Lampe Berger">Lampe Berger</a><!-- 20106101000040 -->
cristy19156992010-03-04 17:04:59 +0000[diff] [blame]128</div>
129<div class="sponsor">
cristy8f900122010-03-05 15:26:31 +0000[diff] [blame]130 <a href="http://www.deko.net">Deko.net</a><!-- 201101010600 Peterssen-->
131</div>
132<div class="sponsor">
cristy1f9e1ed2009-11-18 04:09:38 +0000[diff] [blame]133 <a href="http://www.tomsgutscheine.de">Tom's Gutscheine</a><!-- 201005010360 invendio.de-->
cristy5f2356f2009-11-16 00:40:46 +0000[diff] [blame]134</div>
135<div class="sponsor">
cristycdbe2742010-02-07 19:30:44 +0000[diff] [blame]136 <a href="http://www.online-kredit-index.de">Kredit</a><!-- 201007010120 Buchhorn -->
cristyb4c03bb2009-09-27 13:55:46 +0000[diff] [blame]137</div>
138<div class="sponsor">
cristy0f61e612009-11-10 20:03:57 +0000[diff] [blame]139 <a href="http://www.blumenversender.com">Blumenversand</a><!-- 201005010120 -->
cristy916e1922009-10-01 12:52:47 +0000[diff] [blame]140</div>
141<div class="sponsor">
cristyb4c03bb2009-09-27 13:55:46 +0000[diff] [blame]142 <a href="http://www.print24.de/">Druckerei</a><!-- 201009010720 -->
143</div>
144<div class="sponsor">
cristy16ff93c2010-01-13 23:18:07 +0000[diff] [blame]145 <a href="http://www.allesdruck.de">Druckerei Online</a><!-- 201012011200 allesdruck.de-->
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]146</div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]147</div>
148</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]149
150
151</div>
152
153<div class="main">
154
155
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]156<p class="navigation-index">[<a href="#intro">Introduction to High Dynamic-Range Images</a> &bull; <a href="#enable">Enabling HDRI in ImageMagick</a>]</p>
157
158<h2><a name="intro"></a>Introduction to High Dynamic-Range Images</h2>
159<div class="doc-section">
160
161<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>
162
163<ul>
164 <li>render/capture floating-point color space</li>
165 <li>encompass the entire perceivable gamut (extend values outside [0,1] range)</li>
166 <li>post-process in extended color space</li>
167 <li>apply tone-mapping for specific display</li>
168</ul>
169
170</div>
171
172<h2><a name="enable"></a>Enabling HDRI in ImageMagick</h2>
173<div class="doc-section">
174
175<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>
176
177<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>
178
179<p>To enable the HDRI version of ImageMagick, use this Unix/Linux command:</p>
180
181<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>./configure --enable-hdri</span></p>
182<p>Under Windows, set the <kbd>MAGICKCORE_HDRI_SUPPORT</kbd> definition in the <kbd>magick-config.h</kbd> configuration file and build.</p>
183
184<p>To verify HDRI is properly configured, look for "HDRI" in the version string:</p>
185
cristy320dd6e2010-04-16 20:11:40 +0000[diff] [blame]186<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -version</span><span class='crtout'>Version: ImageMagick 6.6.1-4 2010-04-15 Q16 HDRI http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]187</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]188
189</div>
190
191<div id="linkbar">
192 <!-- <span id="linkbar-west">&nbsp;</span> -->
193 <span id="linkbar-center">
194 <a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> &bull;
cristy3225a072010-04-17 01:47:28 +0000[diff] [blame]195 <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]196 </span>
197 <span id="linkbar-east">&nbsp;</span>
198 </div>
199 <div class="footer">
200 <span id="footer-west">&copy; 1999-2010 ImageMagick Studio LLC</span>
201 <span id="footer-east"> <a href="http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
202 </div>
203 <div style="clear: both; margin: 0; width: 100%; "></div>
204</body>
205</html>