// - it is not defined (i.e. it's value is 0)
// - it's 12, since we will expand the image to 16 bits (see
// PixelConvert::ConvertDecompress12BitsTo16Bits() )
// - it is not defined (i.e. it's value is 0)
// - it's 12, since we will expand the image to 16 bits (see
// PixelConvert::ConvertDecompress12BitsTo16Bits() )