}
		if zigzag[unzig[i]] != i {
			t.Errorf("zigzag[unzig[%d]] == %d", i, zigzag[unzig[i]])
		}
	}
}

// unscaledQuantInNaturalOrder are the unscaled quantization tables in
// natural (not zig-zag) order, as specified in section K.1.
var unscaledQuantInNaturalOrder = [nQuantIndex][blockSize]byte{
	// Luminance.
	{
		16, 11, 10, 16, 24, 40, 51, 61,
		12, 12, 14, 19, 26, 58, 60, 55,