/usr/share/doc/imagemagick/www/high-dynamic-range.html is in imagemagick-doc 8:6.6.9.7-5ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 | <!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="verify-v1" content="g222frIIxcQTrvDR3NBRUSKP3AnMNoqxOkIniCEkV7U="/>
<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."/>
<meta name="Application-url" content="http://www.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="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) 1999-2011 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="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"/>
<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>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
<script type="text/javascript" src="../fancybox/jquery.fancybox-1.3.4.pack.js"></script>
<link rel="stylesheet" type="text/css" href="../fancybox/jquery.fancybox-1.3.4.css" media="screen" />
<script type="text/javascript">
$(document).ready(function() {
$("a[href$=.jpg],a[href$=.png],a[href$=.gif]").fancybox({
'transitionIn' : 'elastic',
'transitionOut' : 'elastic',
'overlayShow' : false,
'opacity' : true
});
});
</script>
</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="http://www.imagemagick.org/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="sep"></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: iPhone" href="../www/binary-releases.html#iPhone">iPhone</a>
</div>
<div class="sub">
<a title="Binary Release: Windows" href="../www/binary-releases.html#windows">Windows</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="../www/magick++.html">Magick++</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="Resources" href="../www/resources.html">Resources</a>
</div>
<div class="menu">
<a title="Architecture" href="../www/architecture.html">Architecture</a>
</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="../www/search.html">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>
<a href="http://www.networkredux.com">
<img src="../images/networkredux.png" alt="[sponsor]"
style="margin-top: 4px; margin-left: 4px; border: 0px; float: left;" /></a>
<div class="sponsbox">
<div class="sponsor">
<a title="Sponsor: Website Hosting" href="http://www.hostreviewgeeks.com">Website Hosting</a><!-- 201108010090 alexanian media -->
</div>
<div class="sponsor">
<a title="Sponsor: Druckerei" href="http://www.allesdruck.de">Druckerei</a><!-- 201303011500 r.leo -->
</div>
<div class="sponsor">
<a title="Sponsor: Web Hosting Reviews" href="http://www.webhostingmasters.com">Web Hosting Reviews</a><!-- 201107011500 affliatelabel -->
</div>
<div class="sponsor">
<a title="Sponsor: Hotel München" href="http://www.messehotel-erb-muenchen.de">Hotel München</a><!-- 201111010450 cerb -->
</div>
<div class="sponsor">
<a title="Sponsor: Best Web Hosting" href="http://webhostinggeeks.com">Best Web Hosting</a><!-- 201110010720 -->
</div>
<div class="sponsor">
<a title="Sponsor: Flyer drucken" href="http://www.online-druck.biz">Flyer drucken</a><!-- 201109010900 Floeter-->
</div>
<div class="sponsor">
<a title="Sponsor: Web Hosting Ratings" href="http://webhostingrating.com">Web Hosting Ratings</a><!-- 201110010720 -->
</div>
<div class="sponsor">
<a title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 201110010720 -->
</div>
<div class="sponsor">
<a title="Sponsor: Free Catalogs" href="http://www.who-sells-it.com/">Free Catalogs</a><!-- 20120801000600 -->
</div>
</div>
</div>
</div>
<div class="eastbar">
</div>
<div class="main">
<h1>ImageMagick High Dynamic-range Imaging</h1>
<p class="navigation-index">[<a href="#intro">Introduction to High Dynamic-Range Images</a> • <a href="#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"> $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">© 1999-2011 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>
<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>
|