1 2 3 4 5<!DOCTYPE html> 6<html lang="en"> 7<head> 8 <meta charset="utf-8" /> 9 <meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1,shrink-to-fit=no" /> 10 <title>High Dynamic-Range Images @ ImageMagick</title> 11 <meta name="application-name" content="ImageMagick" /> 12 <meta name="description" content="Use ImageMagick® to create, edit, compose, or convert bitmap images. 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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> 86 87<ul> 88 <li>render/capture floating-point color space</li> 89 <li>encompass the entire perceivable gamut (extend values outside [0,1] range)</li> 90 <li>post-process in extended color space</li> 91 <li>apply tone-mapping for specific display</li> 92</ul> 93 94<h2><a class="anchor" id="enable"></a>Enabling HDRI in ImageMagick</h2> 95 96<p>By default, image pixels in ImageMagick version 7 are stored in a floating-point representation that range from 0 to the quantum depth, which is typically 16-bits (Q16). With HDRI enabled, the pixels 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> 97 98<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> 99 100<p>To disable the HDRI version of ImageMagick, use this Unix/Linux command:</p> 101 102<pre class="highlight"><code>./configure --disable-hdri 103</code></pre> 104 105<p>Under Windows, uncomment the <code>MAGICKCORE_HDRI_SUPPORT</code> definition in the <code>magick-baseconfig.h</code> configuration file and build.</p> 106 107<p>To verify HDRI is properly configured, look for "HDRI" as a feature:</p> 108 109<pre class="highlight"><code>identify -version 110Features: HDRI 111</code></pre> 112</div> 113 </div> 114 </main><!-- /.container --> 115 <footer class="magick-footer"> 116 <p><a href="security-policy.html">Security</a> • 117 <a href="architecture.html">Architecture</a> • 118 <a href="links.html">Related</a> • 119 <a href="sitemap.html">Sitemap</a> 120 121 <a href="high-dynamic-range.html#"><img class="d-inline" id="wand" alt="And Now a Touch of Magick" width="16" height="16" src="../images/wand.ico"/></a> 122 123 <a href="http://pgp.mit.edu/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> • 124 <a href="support.html">Donate</a> • 125 <a href="https://imagemagick.org/script/contact.php">Contact Us</a> 126 <br/> 127 <small>© 1999-2019 ImageMagick Studio LLC</small></p> 128 </footer> 129 130 <!-- Javascript assets --> 131 <script src="assets/magick.js" crossorigin="anonymous"></script> 132 <script>window.jQuery || document.write('<script src="https://localhost/ajax/libs/jquery/3.3.1/jquery.min.js"><\/script>')</script> 133</body> 134</html> 135<!-- Magick Cache 5th January 2019 11:42 -->
