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Juan Melara – Sony2Alexa PowerGrades
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The standard Sony2Alexa transform is divided into two components, the camera match transform and the output transform.
The first component or transform matches the cameras in linear space and outputs the image in log. It takes S-Log3/S-Gamut3.cine footage from the A7SIII, FX3 and FX6 as the input, linearises the image, matches it to the Alexa, then outputs this match as ARRI LogC/Alexa Wide Gamut.
The second component is an output transform LUT that takes the ARRI LogC/Alexa Wide Gamut image and converts it to Rec709. This takes the flat desaturated log image, applies a LogC to Rec709 2.4 gamma curve, an Alexa Wide Gamut to Rec709 matrix and outputs an image with restored contrast and saturation that will look correct on your display.