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