YCrCb is roughly based on the ones mentioned (which are not at all obscure from the perspective of color science), but is supposed to be as computationally cheap as possible, and so doesn't bother doing even basic steps like undoing gamma encoding.
As a result, YCrCb yields crappy results for any purpose other than image encoding. The further you get from neutral gray, the worse YCrCb gets at cleanly separating lightness from hue/chroma.
As a result, YCrCb yields crappy results for any purpose other than image encoding. The further you get from neutral gray, the worse YCrCb gets at cleanly separating lightness from hue/chroma.