kVTCompressionPropertyKey_LogTransferFunction

Indicates that the transfer function or gamma of the content is a log format and identifies the specific log curve. Log curve identifiers include kCVImageBufferLogTransferFunction_AppleLog (“com.apple.rec2020.apple-log”) and kCVImageBufferLogTransferFunction_AppleLog2 (“com.apple.apple-wide-gamut.apple-log”). When the LogTransferFunction is specified for a VTCompressionSession, if source image buffers do not have exactly that LogTransferFunction, encoding will fail.

let kVTCompressionPropertyKey_LogTransferFunction: CFString