1 2 3 4 5 <!DOCTYPE html> 6 <html lang="en"> 7 <head> 8 <title>ImageMagick: High Dynamic-Range Images</title> 9 <meta charset="utf-8" /> 10 <meta http-equiv="X-UA-Compatible" content="IE=edge" /> 11 <meta name="viewport" content="width=device-width, initial-scale=1" /> 12 <meta http-equiv="content-type" content="text/html; charset=utf-8"/> 13 <meta name="application-name" content="ImageMagick"/> 14 <meta name="description" content="ImageMagick is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, JPEG-2000, GIF, WebP, Postscript, PDF, and SVG. 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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> 61 62 <ul> 63 <li>render/capture floating-point color space</li> 64 <li>encompass the entire perceivable gamut (extend values outside [0,1] range)</li> 65 <li>post-process in extended color space</li> 66 <li>apply tone-mapping for specific display</li> 67 </ul> 68 69 <h2 class="magick-header"><a id="enable"></a>Enabling HDRI in ImageMagick</h2> 70 71 <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> 72 73 <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> 74 75 <p>To enable the HDRI version of ImageMagick, use this Unix/Linux command:</p> 76 77 <pre> 78 ./configure --enable-hdri 79 </pre> 80 81 <p>Under Windows, set the <code>MAGICKCORE_HDRI_SUPPORT</code> definition in the <code>magick-baseconfig.h</code> configuration file and build.</p> 82 83 <p>To verify HDRI is properly configured, look for "HDRI" as a feature:</p> 84 85 <pre> 86 identify -version 87 Features: HDRI 88 </pre> 89 </div> 90 <footer class="magick-footer"> 91 <p><a href="support.html">Donate</a> 92 <a href="sitemap.html">Sitemap</a> 93 <a href="links.html">Related</a> 94 <a href="architecture.html">Architecture</a> 95 </p> 96 <p><a href="high-dynamic-range.html#">Back to top</a> 97 <a href="http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> 98 <a href="http://www.imagemagick.org/script/contact.php">Contact Us</a></p> 99 <p><small> 1999-2016 ImageMagick Studio LLC</small></p> 100 </footer> 101 </div><!-- /.container --> 102 103 <script src="https://localhost/ajax/libs/jquery/1.11.3/jquery.min.js"></script> 104 <script src="../js/magick.html"></script> 105 </div> 106 </body> 107 </html> 108
