From the pictures of error diffusion dithering it looks like they are consistently applied from row-by-row in the same direction (probably left to right). Ther

From the pictures of error diffusion dithering it looks like they are consistently applied from row-by-row in the same direction (probably left to right). There is a variation of these where every odd row is processed in one direction (left to right) and every even row is processed in the other direction (right to left). It usually produces a more visually appealing result.