Documentation/linux_tv/media/v4l/pixfmt-008.rst

   1 .. -*- coding: utf-8; mode: rst -*-
   2
   3 ***************************************
   4 Detailed Transfer Function Descriptions
   5 ***************************************
   6
   7
   8 .. _xf-smpte-2084:
   9
  10 Transfer Function SMPTE 2084 (V4L2_XFER_FUNC_SMPTE2084)
  11 =======================================================
  12
  13 The :ref:`smpte2084` standard defines the transfer function used by
  14 High Dynamic Range content.
  15
  16 Constants:
  17     m1 = (2610 / 4096) / 4
  18
  19     m2 = (2523 / 4096) * 128
  20
  21     c1 = 3424 / 4096
  22
  23     c2 = (2413 / 4096) * 32
  24
  25     c3 = (2392 / 4096) * 32
  26
  27 Transfer function:
  28     L' = ((c1 + c2 * L\ :sup:`m1`) / (1 + c3 * L\ :sup:`m1`))\ :sup:`m2`
  29
  30 Inverse Transfer function:
  31     L = (max(L':sup:`1/m2` - c1, 0) / (c2 - c3 *
  32     L'\ :sup:`1/m2`))\ :sup:`1/m1`
  33
  34
  35 .. ------------------------------------------------------------------------------
  36 .. This file was automatically converted from DocBook-XML with the dbxml
  37 .. library (https://github.com/return42/sphkerneldoc). The origin XML comes
  38 .. from the linux kernel, refer to:
  39 ..
  40 .. * https://github.com/torvalds/linux/tree/master/Documentation/DocBook
  41 .. ------------------------------------------------------------------------------