. "On the other hand, if the magnitudes of the diffused errors are determined by alternating two patterns, such as patterns A and B, in the horizontal direction, the total error diffused into the line that is immediately below the target pixel will alternate between large and small values, such as in the sequence 23/16, 9/16, 23/16, 9/16 . . . that is produced when the patterns A and B are used." . . . .