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Diffstat (limited to 'Documentation/media/uapi/v4l/pixfmt-008.rst')
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diff --git a/Documentation/media/uapi/v4l/pixfmt-008.rst b/Documentation/media/uapi/v4l/pixfmt-008.rst new file mode 100644 index 000000000000..4bec79784bdd --- /dev/null +++ b/Documentation/media/uapi/v4l/pixfmt-008.rst @@ -0,0 +1,32 @@ +.. -*- 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` |