With the advent of HDTV, the problem of negative lobe truncation in the camera sensitivities is to be entirely eliminated by implementing matrix transformations of recorded color tristimuli. The gamma-correction mentioned in Section III-A1 has still been retained due to its perceptual benefits. Instead of YIQ, an opponent color space encoding for gammacorrected RGB **data** has been standardized as the YCrCb space [51]. This space has also been used frequently in recent work on image compression.