![]() This parameter simply overrides the metadata in output of the LUT, it has no effect on the LUT processing and the RGBYCbCr conversions. Specifies the output color transfer characteristics. The colour matrix equations used for the conversion from RGB to YCbCr subsequent to the LUT will be different whether the YCbCr signal expected range is full or narrow. Specifies the expected range of the YCbCr signal subsequent to the conversion from RGB to YCbCr subsequent to the LUT. The colour matrix equations used for the conversion from RGB to YCbCr subsequent to the LUT will be different whether the RGB signal in output of the LUT is full or narrow range.Īuto: Will have the same value than LUTOutputFullRangeFlag. Specifies the range of the output RGB signal subsequent to the LUT. The color matrix equations used for the conversion YCbCr to RGB prior to the LUT will be different whether the expected RGB range is full or narrow.Īuto: Will have the same value as LUTYCbCrToRGBInputFullRangeFlag. Specifies whether the LUT expects full range RGB or narrow range RGB in input. It is mandatory to specify this parameter when a LUT file is used.įalse: Full range flag is false (= legal/narrow/tv range) The colour matrix equations used for the conversion YCbCr to RGB prior to the LUT will be different whether the signal is full or narrow range. Specifies the range of the input YCbCr signal prior to the conversion to RGB prior to the LUT. It is mandatory to specify this parameter when a LUT file is used.īT709: Matrix coefficients are SDR BT-709. Those matrix coefficients will be used when converting from YCbCr to RGB prior to the LUT. Tetrahedral: Use tetrahedral interpolation. Specifies the path to the Look Up Table (LUT) file. The following table provides a description of all the parameters: To perform these conversions, the user needs to provide the matrix coefficients that will be used, along with the expected input and output signal ranges. Thus a conversion from YCbCr to RGB is necessary prior to the LUT, as well as a conversion from RGB to YCbCr in the output of the LUT. (Mandatory parameters are displayed in red.)ģD LUT works by mapping input RGB values to output RGB values. These parameters as well as the LUT processing and its different steps are illustrated in the figure below. In addition to the custom LUT file, a certain number of associated parameters must be provided to define the intent of the custom LUT file in terms of input and output signal characteristics. The 3D LUT conversion feature supports “.cube” format only, up to 65-cube LUT and 3 different interpolation modes. ![]() HDR-SDR cross-conversions can be performed using 3D LUT through a user-provided LUT file. Use of 3D LUT for HDR-SDR Cross-Conversions XTAccess – HDR-SDR Conversions using 3D LUT
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