Mainly depth is included in Y_ and CBCR_LIMIT - the used denominator
255.0 matched only 8 bits.
Add (substract) epsilon 0.5 when converting the to integer to round the
value correctly.
return int -1 if test failed; 0 if succeeded; 1 if not applicable (but
not failed)
As the old and new tests are mostly compatible now, do not take
different approach handling both groups.
