| .. -*- coding: utf-8; mode: rst -*- |
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| *************************************** |
| Detailed Transfer Function Descriptions |
| *************************************** |
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| .. _xf-smpte-2084: |
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| Transfer Function SMPTE 2084 (V4L2_XFER_FUNC_SMPTE2084) |
| ======================================================= |
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| The :ref:`smpte2084` standard defines the transfer function used by |
| High Dynamic Range content. |
| |
| Constants: |
| 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: |
| 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` |
