case YCbCrSubsampleRatio440:
		return "YCbCrSubsampleRatio440"
	case YCbCrSubsampleRatio411:
		return "YCbCrSubsampleRatio411"
	case YCbCrSubsampleRatio410:
		return "YCbCrSubsampleRatio410"
	}
	return "YCbCrSubsampleRatioUnknown"
}

// YCbCr is an in-memory image of Y'CbCr colors. There is one Y sample per
// pixel, but each Cb and Cr sample can span one or more pixels.