Invert presumably uses bitwise not in integer colourspaces, but this has the undesirable effect of biasing inverted UV channels by -1 (in any depth, so across depths it's not a constant bias).
E.g. black (u = 0, v = 0) becomes slightly green (u = -1, v = -1).
Invert presumably uses bitwise not in integer colourspaces, but this has the undesirable effect of biasing inverted UV channels by -1 (in any depth, so across depths it's not a constant bias).
E.g. black (u = 0, v = 0) becomes slightly green (u = -1, v = -1).