Agreed. The issue isn't how to do the conversion, it is how to
determine the input arguments.

But OCIO has this problem anyway. There is no definition for how a
given image can help influence what conversion is used. In a
commercial tool, the conversion is chosen by the user, where the list
of options is everything in the config.

OCIO has routines to do a conversion if the "conversion name" is
provided. OCIO could easily have routines to do conversions if the
gamma-matrix-gamma is provided. Either way, commercial tools have to
decide if the conversion hints come from the user, the filename, the
header, the environment, or whatever.

RGB