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gerrit-public.fairphone.software / platform / external / ImageMagick / d0c5146baf2b7536cea0e846e8a6879d069d9c12 / . / www / high-dynamic-range.html
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209<div class="main">
210
211
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]212<h1>ImageMagick High Dynamic-range Imaging</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]213<p class="navigation-index">[<a href="#intro">Introduction to High Dynamic-Range Images</a> &bull; <a href="#enable">Enabling HDRI in ImageMagick</a>]</p>
214
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]215<a id="intro"></a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]216<div class="doc-section">
217
218<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>
219
220<ul>
221 <li>render/capture floating-point color space</li>
222 <li>encompass the entire perceivable gamut (extend values outside [0,1] range)</li>
223 <li>post-process in extended color space</li>
224 <li>apply tone-mapping for specific display</li>
225</ul>
226
227</div>
228
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]229<h2><a id="enable"></a>Enabling HDRI in ImageMagick</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]230<div class="doc-section">
231
232<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>
233
234<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>
235
236<p>To enable the HDRI version of ImageMagick, use this Unix/Linux command:</p>
237
238<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>./configure --enable-hdri</span></p>
239<p>Under Windows, set the <kbd>MAGICKCORE_HDRI_SUPPORT</kbd> definition in the <kbd>magick-config.h</kbd> configuration file and build.</p>
240
cristybebec402010-04-23 19:19:08 +0000[diff] [blame]241<p>To verify HDRI is properly configured, look for "HDRI" as a feature:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]242
cristybebec402010-04-23 19:19:08 +0000[diff] [blame]243<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -version</span><span class='crtout'>Features: OpenMP HDRI</span></p></div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]244
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267 ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
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cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]271</body>
272</html>