b :: YCbCr -> Pixel8
b (y, cb, cr) = (assertBounded . round) (y + 2.033 * cb)
b :: YCbCr -> Pixel8
b (y, cb, cr) = (assertBounded . round) (y + 2.033 * cb)
b (y, cb, cr) = (assertBounded . round) (y + 2.033 * cb)