const (
	quantIndexLuminance quantIndex = iota
	quantIndexChrominance
	nQuantIndex
)

// unscaledQuant are the unscaled quantization tables in zig-zag order. Each
// encoder copies and scales the tables according to its quality parameter.
// The values are derived from section K.1 after converting from natural to
// zig-zag order.
var unscaledQuant = [nQuantIndex][blockSize]byte{
	// Luminance.
	{
		16, 11, 12, 14, 12, 10, 16, 14,