CVImageLogTransferFunction
Identifies the specific log curve transfer function or gamma of the content.
Declaration
enum CVImageLogTransferFunctionOverview
Log is a specific video format usually processed in a camera’s ISP. A Log video format usually defines:
Scene-referred color primaries designed to preserve the chromaticity range captured by a camera sensor. In cinematography, “scene-referred” color primaries refers to a color space designed to accurately preserve the chromaticity and dynamic range directly captured by a camera sensor.
A specific gamma curve (or transfer characteristic) tailored to capturing the full dynamic range from the sensor. This gamma curve is usually shaped like a log curve (hence the name Log).
A set of matrix transforms to go from RGB to Y’CbCr (Y’CbCr being the most common format used to store the bits compressed into a file).
As described above, a Log video format defines a whole color space (even though the “log” part of the name comes only from the “transfer characteristic” or gamma curve).