33 lines
742 B
ReStructuredText
33 lines
742 B
ReStructuredText
|
.. -*- coding: utf-8; mode: rst -*-
|
||
|
|
||
|
***************************************
|
||
|
Detailed Transfer Function Descriptions
|
||
|
***************************************
|
||
|
|
||
|
|
||
|
.. _xf-smpte-2084:
|
||
|
|
||
|
Transfer Function SMPTE 2084 (V4L2_XFER_FUNC_SMPTE2084)
|
||
|
=======================================================
|
||
|
|
||
|
The :ref:`smpte2084` standard defines the transfer function used by
|
||
|
High Dynamic Range content.
|
||
|
|
||
|
Constants:
|
||
|
m1 = (2610 / 4096) / 4
|
||
|
|
||
|
m2 = (2523 / 4096) * 128
|
||
|
|
||
|
c1 = 3424 / 4096
|
||
|
|
||
|
c2 = (2413 / 4096) * 32
|
||
|
|
||
|
c3 = (2392 / 4096) * 32
|
||
|
|
||
|
Transfer function:
|
||
|
L' = ((c1 + c2 * L\ :sup:`m1`) / (1 + c3 * L\ :sup:`m1`))\ :sup:`m2`
|
||
|
|
||
|
Inverse Transfer function:
|
||
|
L = (max(L':sup:`1/m2` - c1, 0) / (c2 - c3 *
|
||
|
L'\ :sup:`1/m2`))\ :sup:`1/m1`
|