dither
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Three ramps from white to black across forty-eight columns. The first uses only the four densities the character set offers: light shade, medium shade, dark shade, full block. The second interleaves neighbouring shades through a Bayer matrix to fake sixteen steps. The third throws the shades away and dithers with the full block alone. The middle method became the ground of moiré; the plain two-tone version is what overstrike is drawn with.