Yup, and unlike many of the “proprietary but targeted towards professional use” colorspaces (Sony S-Gamut, etc) and transfer functions (Canon C-Log, Sony S-Log1/2/3, Panasonic V-Log, etc) which have their primaries and transfer functions documented somewhere, many of these lower end cameras have arbitrary transfer functions and primaries that aren’t documented.
For example, the only documentation on Yuneec’s “FLAT” profile mode is “Intended for color grading in postprocessing” - HOW? To properly color grade this, I need to know the transfer function, and I need to know the primaries. Neither of these are documented ANYWHERE. The saturation/contrast properties of the video when displayed with something that assumes it’s Rec709 hint strongly that it’s a wide gamut log-transfer system, but you can’t properly generate a LUT for such a thing unless you know the actual primaries of the gamut and the transfer function.
All of the documentation I see regarding tiff transfer functions is related to an assumption that the tiff was saved with appropriate transfer function tags.
In this case, we have a JPEG that, in my case, has (at most) a manufacturer specific tag that says it was saved with the “FLAT” profile - which is undocumented and unknown.