r :: YCbCr -> Pixel8
r (y, cb, cr) = (assertBounded . round) (y + 1.14 * cr)
r :: YCbCr -> Pixel8
r (y, cb, cr) = (assertBounded . round) (y + 1.14 * cr)
r (y, cb, cr) = (assertBounded . round) (y + 1.14 * cr)