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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Detailed Transfer Function Descriptions</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="LINUX MEDIA INFRASTRUCTURE API"><link rel="up" href="pixfmt.html" title="Chapter 2. Image Formats"><link rel="prev" href="ch02s06.html" title="Detailed Colorspace Descriptions"><link rel="next" href="pixfmt-indexed.html" title="Indexed Format"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Detailed Transfer Function Descriptions</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch02s06.html">Prev</a> </td><th width="60%" align="center">Chapter 2. Image Formats</th><td width="20%" align="right"> <a accesskey="n" href="pixfmt-indexed.html">Next</a></td></tr></table><hr></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="id-1.4.5.9"></a>Detailed Transfer Function Descriptions</h2></div></div></div><div class="toc"><dl class="toc"><dt><span class="section"><a href="ch02s07.html#xf-smpte-2084">Transfer Function SMPTE 2084 (<code class="constant">V4L2_XFER_FUNC_SMPTE2084</code>)</a></span></dt></dl></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="xf-smpte-2084"></a>Transfer Function SMPTE 2084 (<code class="constant">V4L2_XFER_FUNC_SMPTE2084</code>)</h3></div></div></div><p>The <a class="xref" href="bi01.html#smpte2084" title='SMPTE ST 2084:2014 "High Dynamic Range Electro-Optical Transfer Function of Master Reference Displays"'>[<abbr class="abbrev">SMPTE ST 2084</abbr>]</a> standard defines the transfer function used by
High Dynamic Range content.</p><div class="variablelist"><dl class="variablelist"><dt><span class="term">Constants:</span></dt><dd><p>m1 = (2610 / 4096) / 4</p><p>m2 = (2523 / 4096) * 128</p><p>c1 = 3424 / 4096</p><p>c2 = (2413 / 4096) * 32</p><p>c3 = (2392 / 4096) * 32</p></dd><dt><span class="term">Transfer function:</span></dt><dd><p>L' = ((c1 + c2 * L<sup>m1</sup>) / (1 + c3 * L<sup>m1</sup>))<sup>m2</sup></p></dd></dl></div><div class="variablelist"><dl class="variablelist"><dt><span class="term">Inverse Transfer function:</span></dt><dd><p>L = (max(L'<sup>1/m2</sup> - c1, 0) / (c2 - c3 * L'<sup>1/m2</sup>))<sup>1/m1</sup></p></dd></dl></div></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch02s06.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="pixfmt.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="pixfmt-indexed.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Detailed Colorspace Descriptions </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Indexed Format</td></tr></table></div></body></html>