[Image-SIG] Difference between ImageOps.invert() and ImageChops.invert()?

[Spoon Reloaded]

Don't the methods ImageOps.invert() and ImageChops.invert() do the
same thing? If so, why do we need two different implementations (the
latter calls a C function while the former builds a lookup table and
uses the image transforming functions)? It seems to me that if they do
the same thing then one should call the other or something.